<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:cik0000757010="http://franklintempleton.com/20260228"
  xmlns:dei="http://xbrl.sec.gov/dei/2025"
  xmlns:fnd="http://xbrl.sec.gov/fnd/2025"
  xmlns:iso4217="http://www.xbrl.org/2003/iso4217"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:oef="http://xbrl.sec.gov/oef/2025"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xhtml="http://www.w3.org/1999/xhtml"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="c485bpos-20260625.xsd" xlink:type="simple"/>
    <context id="Context_20260228_20260228">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018802Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018802Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018803Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018803Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000194372Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194372Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000074134Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000074134Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006932Member_PrincipalRisks2_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:PrincipalRisks2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006932Member_RiskLoseMoneyMember_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006932Member_RiskNotInsuredMember_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006932Member_InterestRate2_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:InterestRate2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006932Member_Credit2_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Credit2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006932Member_Liquidity2_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Liquidity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006932Member_TaxLegislativeandPoliticalChanges2_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:TaxLegislativeandPoliticalChanges2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006932Member_Tax-ExemptSecurities2_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Tax-ExemptSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006932Member_Market2_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Market2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006932Member_States2_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:States2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006932Member_Focus2_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Focus2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006932Member_Income2_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Income2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006932Member_Prepayment2_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Prepayment2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006932Member_Inflation2_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Inflation2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006932Member_BondInsurers2_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:BondInsurers2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006932Member_UnratedDebtSecurities2_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:UnratedDebtSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006932Member_Management2_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Management2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006932Member_Cybersecurity2_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Cybersecurity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20161231_20161231_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-12-31</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Context_20171231_20171231_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-12-31</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Context_20181231_20181231_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-12-31</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Context_20191231_20191231_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-12-31</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Context_20201231_20201231_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-12-31</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Context_20211231_20211231_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-12-31</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Context_20221231_20221231_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-12-31</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Context_20231231_20231231_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-31</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Context_20241231_20241231_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-12-31</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Context_20251231_20251231_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-12-31</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205910Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205910Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018802Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018802Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018802Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018802Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018802Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018802Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018803Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018803Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018803Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018803Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018803Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018803Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000194372Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194372Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000194372Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194372Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000074134Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000074134Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000074134Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000074134Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000074134Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000074134Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalBondIndex31_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex31Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalBondIndex31_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex31Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalBondIndex31_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex31Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalBondIndex31_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex31Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipal1-15YearIndex32_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipal1-15YearIndex32Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipal1-15YearIndex32_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipal1-15YearIndex32Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipal1-15YearIndex32_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipal1-15YearIndex32Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipal1-15YearIndex32_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipal1-15YearIndex32Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018804Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018804Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000194373Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194373Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000096868Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000096868Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006933Member_PrincipalRisks2_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:PrincipalRisks2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006933Member_RiskLoseMoneyMember_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006933Member_RiskNotInsuredMember_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006933Member_InterestRate2_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:InterestRate2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006933Member_Credit2_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Credit2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006933Member_Liquidity2_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Liquidity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006933Member_TaxLegislativeandPoliticalChanges2_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:TaxLegislativeandPoliticalChanges2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006933Member_Tax-ExemptSecurities2_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Tax-ExemptSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006933Member_Market2_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Market2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006933Member_States2_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:States2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006933Member_Focus2_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Focus2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006933Member_Income2_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Income2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006933Member_Prepayment2_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Prepayment2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006933Member_Inflation2_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Inflation2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006933Member_BondInsurers2_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:BondInsurers2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006933Member_UnratedDebtSecurities2_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:UnratedDebtSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006933Member_Management2_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Management2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006933Member_Cybersecurity2_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Cybersecurity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20161231_20161231_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-12-31</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Context_20171231_20171231_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-12-31</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Context_20181231_20181231_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-12-31</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Context_20191231_20191231_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-12-31</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Context_20201231_20201231_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-12-31</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Context_20211231_20211231_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-12-31</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Context_20221231_20221231_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-12-31</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Context_20231231_20231231_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-31</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Context_20241231_20241231_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-12-31</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Context_20251231_20251231_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-12-31</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205911Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018804Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018804Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018804Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018804Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018804Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018804Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000194373Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194373Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000194373Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194373Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000096868Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000096868Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000096868Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000096868Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000096868Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000096868Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalBondIndex33_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex33Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalBondIndex33_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex33Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalBondIndex33_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex33Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalBondIndex33_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex33Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalShort1-5YearsIndex34_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalShort1-5YearsIndex34Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalShort1-5YearsIndex34_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalShort1-5YearsIndex34Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalShort1-5YearsIndex34_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalShort1-5YearsIndex34Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalShort1-5YearsIndex34_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalShort1-5YearsIndex34Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018758Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018758Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018760Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018760Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000194355Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194355Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018757Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018757Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_PrincipalRisks2_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:PrincipalRisks2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_RiskLoseMoneyMember_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_RiskNotInsuredMember_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_InterestRate2_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:InterestRate2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_Credit2_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Credit2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_Liquidity2_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Liquidity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_TaxLegislativeandPoliticalChanges2_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:TaxLegislativeandPoliticalChanges2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_Tax-ExemptSecurities2_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Tax-ExemptSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_Market2_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Market2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_conditionsthatarenotspecificallyrelatedtoaparticularissuersuchas2_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:conditionsthatarenotspecificallyrelatedtoaparticularissuersuchas2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_High-YieldDebtInstruments2_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:High-YieldDebtInstruments2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_States2_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:States2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_Focus2_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Focus2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_Income2_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Income2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_Prepayment2_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Prepayment2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_Inflation2_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Inflation2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_BondInsurers2_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:BondInsurers2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_UnratedDebtSecurities2_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:UnratedDebtSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_Management2_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Management2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006913Member_Cybersecurity2_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Cybersecurity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20161231_20161231_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-12-31</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Context_20171231_20171231_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-12-31</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Context_20181231_20181231_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-12-31</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Context_20191231_20191231_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-12-31</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Context_20201231_20201231_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-12-31</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Context_20211231_20211231_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-12-31</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Context_20221231_20221231_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-12-31</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Context_20231231_20231231_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-31</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Context_20241231_20241231_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-12-31</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Context_20251231_20251231_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-12-31</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000199703Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000199703Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018758Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018758Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018758Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018758Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018758Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018758Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018760Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018760Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018760Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018760Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018760Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018760Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000194355Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194355Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000194355Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194355Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018757Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018757Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018757Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018757Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018757Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018757Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalBondIndex35_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex35Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalBondIndex35_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex35Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalBondIndex35_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex35Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalBondIndex35_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex35Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018769Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018769Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018770Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018770Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000194359Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194359Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000079636Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079636Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006918Member_PrincipalRisks2_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:PrincipalRisks2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006918Member_RiskLoseMoneyMember_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006918Member_RiskNotInsuredMember_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006918Member_InterestRate2_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:InterestRate2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006918Member_Credit2_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Credit2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006918Member_Liquidity2_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Liquidity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006918Member_TaxLegislativeandPoliticalChanges2_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:TaxLegislativeandPoliticalChanges2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006918Member_Tax-ExemptSecurities2_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Tax-ExemptSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006918Member_Market2_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Market2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006918Member_Massachusetts2_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Massachusetts2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006918Member_Focus2_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Focus2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006918Member_Income2_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Income2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006918Member_Prepayment2_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Prepayment2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006918Member_Inflation2_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Inflation2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006918Member_BondInsurers2_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:BondInsurers2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006918Member_UnratedDebtSecurities2_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:UnratedDebtSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006918Member_Management2_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Management2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006918Member_Cybersecurity2_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Cybersecurity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20161231_20161231_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-12-31</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Context_20171231_20171231_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-12-31</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Context_20181231_20181231_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-12-31</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Context_20191231_20191231_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-12-31</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Context_20201231_20201231_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-12-31</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Context_20211231_20211231_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-12-31</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Context_20221231_20221231_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-12-31</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Context_20231231_20231231_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-31</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Context_20241231_20241231_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-12-31</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Context_20251231_20251231_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-12-31</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205897Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205897Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018769Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018769Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018769Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018769Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018769Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018769Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018770Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018770Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018770Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018770Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018770Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018770Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000194359Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194359Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000194359Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194359Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000079636Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079636Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000079636Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079636Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000079636Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079636Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalBondIndex36_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex36Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalBondIndex36_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex36Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalBondIndex36_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex36Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalBondIndex36_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex36Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018781Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018781Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018783Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018783Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000194364Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194364Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000068551Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000068551Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006923Member_PrincipalRisks2_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:PrincipalRisks2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006923Member_RiskLoseMoneyMember_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006923Member_RiskNotInsuredMember_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006923Member_InterestRate2_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:InterestRate2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006923Member_Credit2_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Credit2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006923Member_Liquidity2_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Liquidity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006923Member_TaxLegislativeandPoliticalChanges2_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:TaxLegislativeandPoliticalChanges2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006923Member_Tax-ExemptSecurities2_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Tax-ExemptSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006923Member_Market2_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Market2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006923Member_NewJersey2_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:NewJersey2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006923Member_Focus2_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Focus2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006923Member_Income2_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Income2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006923Member_Prepayment2_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Prepayment2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006923Member_Inflation2_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Inflation2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006923Member_BondInsurers2_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:BondInsurers2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006923Member_UnratedDebtSecurities2_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:UnratedDebtSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006923Member_Management2_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Management2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006923Member_Cybersecurity2_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Cybersecurity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20161231_20161231_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-12-31</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Context_20171231_20171231_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-12-31</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Context_20181231_20181231_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-12-31</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Context_20191231_20191231_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-12-31</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Context_20201231_20201231_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-12-31</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Context_20211231_20211231_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-12-31</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Context_20221231_20221231_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-12-31</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Context_20231231_20231231_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-31</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Context_20241231_20241231_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-12-31</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Context_20251231_20251231_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-12-31</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205902Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205902Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018781Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018781Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018781Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018781Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018781Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018781Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018783Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018783Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018783Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018783Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018783Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018783Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000194364Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194364Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000194364Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194364Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000068551Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000068551Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000068551Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000068551Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000068551Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000068551Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalBondIndex37_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex37Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalBondIndex37_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex37Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalBondIndex37_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex37Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalBondIndex37_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex37Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018753Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018753Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018754Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018754Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000194353Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194353Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000173665Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000173665Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006911Member_PrincipalRisks2_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:PrincipalRisks2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006911Member_RiskLoseMoneyMember_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006911Member_RiskNotInsuredMember_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006911Member_InterestRate2_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:InterestRate2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006911Member_Credit2_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Credit2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006911Member_Liquidity2_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Liquidity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006911Member_TaxLegislativeandPoliticalChanges2_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:TaxLegislativeandPoliticalChanges2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006911Member_Tax-ExemptSecurities2_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Tax-ExemptSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006911Member_Market2_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Market2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006911Member_Alabama2_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Alabama2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006911Member_Focus2_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Focus2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006911Member_Income2_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Income2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006911Member_Prepayment2_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Prepayment2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006911Member_Inflation2_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Inflation2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006911Member_BondInsurers2_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:BondInsurers2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006911Member_UnratedDebtSecurities2_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:UnratedDebtSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006911Member_Management2_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Management2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006911Member_Cybersecurity2_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Cybersecurity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20161231_20161231_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-12-31</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Context_20171231_20171231_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-12-31</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Context_20181231_20181231_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-12-31</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Context_20191231_20191231_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-12-31</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Context_20201231_20201231_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-12-31</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Context_20211231_20211231_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-12-31</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Context_20221231_20221231_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-12-31</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Context_20231231_20231231_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-31</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Context_20241231_20241231_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-12-31</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Context_20251231_20251231_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-12-31</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205892Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205892Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018753Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018753Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018753Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018753Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018753Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018753Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018754Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018754Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018754Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018754Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018754Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018754Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000194353Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194353Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000194353Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194353Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000173665Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000173665Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000173665Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000173665Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000173665Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000173665Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalBondIndex38_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex38Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalBondIndex38_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex38Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalBondIndex38_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex38Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalBondIndex38_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex38Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018755Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018755Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018756Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018756Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000194354Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194354Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000173666Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000173666Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006912Member_PrincipalRisks2_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:PrincipalRisks2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006912Member_RiskLoseMoneyMember_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006912Member_RiskNotInsuredMember_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006912Member_InterestRate2_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:InterestRate2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006912Member_Credit2_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Credit2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006912Member_Liquidity2_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Liquidity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006912Member_TaxLegislativeandPoliticalChanges2_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:TaxLegislativeandPoliticalChanges2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006912Member_Tax-ExemptSecurities2_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Tax-ExemptSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006912Member_Market2_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Market2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006912Member_Georgia2_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Georgia2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006912Member_Focus2_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Focus2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006912Member_Income2_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Income2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006912Member_Prepayment2_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Prepayment2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006912Member_Inflation2_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Inflation2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006912Member_BondInsurers2_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:BondInsurers2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006912Member_UnratedDebtSecurities2_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:UnratedDebtSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006912Member_Management2_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Management2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006912Member_Cybersecurity2_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Cybersecurity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20161231_20161231_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-12-31</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Context_20171231_20171231_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-12-31</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Context_20181231_20181231_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-12-31</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Context_20191231_20191231_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-12-31</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Context_20201231_20201231_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-12-31</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Context_20211231_20211231_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-12-31</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Context_20221231_20221231_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-12-31</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Context_20231231_20231231_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-31</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Context_20241231_20241231_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-12-31</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Context_20251231_20251231_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-12-31</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205893Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205893Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018755Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018755Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018755Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018755Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018755Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018755Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018756Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018756Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018756Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018756Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018756Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018756Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000194354Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194354Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000194354Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194354Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000173666Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000173666Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000173666Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000173666Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000173666Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000173666Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalBondIndex39_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex39Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalBondIndex39_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex39Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalBondIndex39_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex39Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalBondIndex39_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex39Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018765Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018765Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018766Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018766Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000194357Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194357Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000173668Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000173668Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006916Member_PrincipalRisks2_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:PrincipalRisks2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006916Member_RiskLoseMoneyMember_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006916Member_RiskNotInsuredMember_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006916Member_InterestRate2_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:InterestRate2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006916Member_Credit2_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Credit2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006916Member_Liquidity2_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Liquidity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006916Member_TaxLegislativeandPoliticalChanges2_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:TaxLegislativeandPoliticalChanges2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006916Member_Tax-ExemptSecurities2_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Tax-ExemptSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006916Member_Market2_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Market2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006916Member_Louisiana2_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Louisiana2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006916Member_Focus2_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Focus2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006916Member_Income2_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Income2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006916Member_Prepayment2_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Prepayment2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006916Member_Inflation2_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Inflation2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006916Member_BondInsurers2_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:BondInsurers2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006916Member_UnratedDebtSecurities2_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:UnratedDebtSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006916Member_Management2_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Management2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006916Member_Cybersecurity2_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Cybersecurity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20161231_20161231_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-12-31</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Context_20171231_20171231_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-12-31</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Context_20181231_20181231_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-12-31</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Context_20191231_20191231_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-12-31</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Context_20201231_20201231_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-12-31</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Context_20211231_20211231_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-12-31</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Context_20221231_20221231_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-12-31</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Context_20231231_20231231_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-31</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Context_20241231_20241231_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-12-31</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Context_20251231_20251231_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-12-31</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205895Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205895Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018765Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018765Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018765Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018765Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018765Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018765Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018766Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018766Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018766Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018766Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018766Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018766Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000194357Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194357Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000194357Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194357Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000173668Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000173668Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000173668Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000173668Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000173668Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000173668Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalBondIndex310_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex310Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalBondIndex310_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex310Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalBondIndex310_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex310Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalBondIndex310_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex310Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018767Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018767Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018768Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018768Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000194358Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194358Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000079635Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079635Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006917Member_PrincipalRisks2_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:PrincipalRisks2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006917Member_RiskLoseMoneyMember_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006917Member_RiskNotInsuredMember_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006917Member_InterestRate2_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:InterestRate2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006917Member_Credit2_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Credit2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006917Member_Liquidity2_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Liquidity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006917Member_TaxLegislativeandPoliticalChanges2_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:TaxLegislativeandPoliticalChanges2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006917Member_Tax-ExemptSecurities2_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Tax-ExemptSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006917Member_Market2_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Market2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006917Member_Maryland2_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Maryland2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006917Member_Focus2_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Focus2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006917Member_Income2_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Income2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006917Member_Prepayment2_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Prepayment2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006917Member_Inflation2_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Inflation2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006917Member_BondInsurers2_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:BondInsurers2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006917Member_UnratedDebtSecurities2_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:UnratedDebtSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006917Member_Management2_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Management2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006917Member_Cybersecurity2_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Cybersecurity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20161231_20161231_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-12-31</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Context_20171231_20171231_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-12-31</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Context_20181231_20181231_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-12-31</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Context_20191231_20191231_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-12-31</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Context_20201231_20201231_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-12-31</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Context_20211231_20211231_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-12-31</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Context_20221231_20221231_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-12-31</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Context_20231231_20231231_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-31</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Context_20241231_20241231_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-12-31</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Context_20251231_20251231_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-12-31</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205896Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205896Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018767Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018767Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018767Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018767Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018767Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018767Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018768Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018768Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018768Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018768Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018768Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018768Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000194358Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194358Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000194358Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194358Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000079635Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079635Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000079635Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079635Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000079635Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079635Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalBondIndex311_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex311Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalBondIndex311_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex311Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalBondIndex311_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex311Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalBondIndex311_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex311Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018776Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018776Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018777Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018777Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000194362Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194362Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000079638Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079638Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006921Member_PrincipalRisks2_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:PrincipalRisks2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006921Member_RiskLoseMoneyMember_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006921Member_RiskNotInsuredMember_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006921Member_InterestRate2_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:InterestRate2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006921Member_Credit2_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Credit2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006921Member_Liquidity2_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Liquidity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006921Member_TaxLegislativeandPoliticalChanges2_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:TaxLegislativeandPoliticalChanges2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006921Member_Tax-ExemptSecurities2_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Tax-ExemptSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006921Member_Market2_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Market2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006921Member_Missouri2_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Missouri2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006921Member_Focus2_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Focus2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006921Member_Income2_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Income2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006921Member_Prepayment2_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Prepayment2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006921Member_Inflation2_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Inflation2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006921Member_BondInsurers2_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:BondInsurers2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006921Member_UnratedDebtSecurities2_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:UnratedDebtSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006921Member_Management2_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Management2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006921Member_Cybersecurity2_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Cybersecurity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20161231_20161231_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-12-31</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Context_20171231_20171231_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-12-31</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Context_20181231_20181231_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-12-31</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Context_20191231_20191231_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-12-31</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Context_20201231_20201231_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-12-31</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Context_20211231_20211231_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-12-31</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Context_20221231_20221231_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-12-31</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Context_20231231_20231231_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-31</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Context_20241231_20241231_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-12-31</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Context_20251231_20251231_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-12-31</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205900Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205900Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018776Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018776Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018776Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018776Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018776Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018776Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018777Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018777Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018777Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018777Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018777Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018777Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000194362Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194362Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000194362Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194362Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000079638Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079638Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000079638Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079638Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000079638Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079638Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalBondIndex312_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex312Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalBondIndex312_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex312Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalBondIndex312_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex312Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalBondIndex312_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex312Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018784Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018784Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018785Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018785Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000194365Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194365Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000079639Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079639Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006924Member_PrincipalRisks2_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:PrincipalRisks2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006924Member_RiskLoseMoneyMember_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006924Member_RiskNotInsuredMember_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006924Member_InterestRate2_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:InterestRate2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006924Member_Credit2_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Credit2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006924Member_Liquidity2_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Liquidity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006924Member_TaxLegislativeandPoliticalChanges2_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:TaxLegislativeandPoliticalChanges2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006924Member_Tax-ExemptSecurities2_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Tax-ExemptSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006924Member_Market2_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Market2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006924Member_NorthCarolina2_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:NorthCarolina2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006924Member_Focus2_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Focus2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006924Member_Income2_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Income2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006924Member_Prepayment2_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Prepayment2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006924Member_Inflation2_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Inflation2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006924Member_BondInsurers2_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:BondInsurers2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006924Member_UnratedDebtSecurities2_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:UnratedDebtSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006924Member_Management2_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Management2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006924Member_Cybersecurity2_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Cybersecurity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20161231_20161231_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-12-31</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Context_20171231_20171231_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-12-31</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Context_20181231_20181231_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-12-31</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Context_20191231_20191231_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-12-31</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Context_20201231_20201231_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-12-31</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Context_20211231_20211231_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-12-31</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Context_20221231_20221231_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-12-31</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Context_20231231_20231231_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-31</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Context_20241231_20241231_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-12-31</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Context_20251231_20251231_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-12-31</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205903Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205903Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018784Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018784Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018784Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018784Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018784Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018784Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018785Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018785Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018785Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018785Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018785Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018785Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000194365Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194365Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000194365Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194365Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000079639Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079639Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000079639Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079639Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000079639Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079639Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalBondIndex313_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex313Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalBondIndex313_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex313Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalBondIndex313_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex313Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalBondIndex313_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex313Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018794Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018794Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018795Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018795Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000194369Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194369Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000079642Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079642Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006928Member_PrincipalRisks2_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:PrincipalRisks2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006928Member_RiskLoseMoneyMember_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006928Member_RiskNotInsuredMember_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006928Member_InterestRate2_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:InterestRate2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006928Member_Credit2_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Credit2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006928Member_Liquidity2_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Liquidity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006928Member_TaxLegislativeandPoliticalChanges2_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:TaxLegislativeandPoliticalChanges2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006928Member_Tax-ExemptSecurities2_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Tax-ExemptSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006928Member_Market2_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Market2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006928Member_Virginia2_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Virginia2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006928Member_Focus2_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Focus2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006928Member_Income2_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Income2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006928Member_Prepayment2_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Prepayment2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006928Member_Inflation2_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Inflation2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006928Member_BondInsurers2_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:BondInsurers2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006928Member_UnratedDebtSecurities2_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:UnratedDebtSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006928Member_Management2_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Management2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006928Member_Cybersecurity2_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Cybersecurity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20161231_20161231_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-12-31</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Context_20171231_20171231_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-12-31</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Context_20181231_20181231_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-12-31</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Context_20191231_20191231_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-12-31</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Context_20201231_20201231_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-12-31</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Context_20211231_20211231_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-12-31</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Context_20221231_20221231_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-12-31</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Context_20231231_20231231_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-31</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Context_20241231_20241231_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-12-31</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Context_20251231_20251231_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-12-31</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205907Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205907Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018794Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018794Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018794Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018794Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018794Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018794Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018795Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018795Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018795Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018795Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018795Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018795Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000194369Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194369Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000194369Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194369Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000079642Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079642Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000079642Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079642Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000079642Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079642Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalBondIndex314_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex314Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalBondIndex314_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex314Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalBondIndex314_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex314Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalBondIndex314_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex314Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018778Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018778Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018780Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018780Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000194363Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194363Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000068550Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000068550Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006922Member_PrincipalRisks2_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:PrincipalRisks2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006922Member_RiskLoseMoneyMember_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006922Member_RiskNotInsuredMember_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006922Member_InterestRate2_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:InterestRate2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006922Member_Credit2_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Credit2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006922Member_Liquidity2_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Liquidity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006922Member_TaxLegislativeandPoliticalChanges2_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:TaxLegislativeandPoliticalChanges2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006922Member_Tax-ExemptSecurities2_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Tax-ExemptSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006922Member_Market2_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Market2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006922Member_Arizona2_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Arizona2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006922Member_Focus2_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Focus2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006922Member_Income2_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Income2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006922Member_Prepayment2_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Prepayment2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006922Member_Inflation2_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Inflation2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006922Member_BondInsurers2_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:BondInsurers2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006922Member_UnratedDebtSecurities2_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:UnratedDebtSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006922Member_Management2_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Management2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006922Member_Cybersecurity2_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Cybersecurity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20161231_20161231_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-12-31</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Context_20171231_20171231_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-12-31</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Context_20181231_20181231_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-12-31</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Context_20191231_20191231_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-12-31</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Context_20201231_20201231_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-12-31</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Context_20211231_20211231_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-12-31</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Context_20221231_20221231_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-12-31</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Context_20231231_20231231_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-31</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Context_20241231_20241231_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-12-31</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Context_20251231_20251231_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-12-31</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205901Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205901Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018778Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018778Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018778Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018778Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018778Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018778Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018780Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018780Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018780Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018780Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018780Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018780Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000194363Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194363Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000194363Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194363Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000068550Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000068550Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000068550Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000068550Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000068550Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000068550Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalBondIndex315_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex315Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalBondIndex315_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex315Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalBondIndex315_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex315Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalBondIndex315_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex315Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018796Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018796Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018797Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018797Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000194370Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194370Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000079643Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079643Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006929Member_PrincipalRisks2_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:PrincipalRisks2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006929Member_RiskLoseMoneyMember_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006929Member_RiskNotInsuredMember_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006929Member_InterestRate2_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:InterestRate2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006929Member_Credit2_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Credit2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006929Member_Liquidity2_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Liquidity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006929Member_TaxLegislativeandPoliticalChanges2_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:TaxLegislativeandPoliticalChanges2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006929Member_Tax-ExemptSecurities2_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Tax-ExemptSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006929Member_Market2_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Market2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006929Member_Colorado2_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Colorado2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006929Member_Focus2_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Focus2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006929Member_Income2_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Income2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006929Member_Prepayment2_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Prepayment2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006929Member_Inflation2_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Inflation2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006929Member_BondInsurers2_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:BondInsurers2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006929Member_UnratedDebtSecurities2_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:UnratedDebtSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006929Member_Management2_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Management2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006929Member_Cybersecurity2_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Cybersecurity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20161231_20161231_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-12-31</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Context_20171231_20171231_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-12-31</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Context_20181231_20181231_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-12-31</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Context_20191231_20191231_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-12-31</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Context_20201231_20201231_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-12-31</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Context_20211231_20211231_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-12-31</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Context_20221231_20221231_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-12-31</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Context_20231231_20231231_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-31</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Context_20241231_20241231_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-12-31</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Context_20251231_20251231_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-12-31</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205908Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205908Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018796Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018796Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018796Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018796Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018796Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018796Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018797Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018797Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018797Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018797Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018797Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018797Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000194370Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194370Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000194370Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194370Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000079643Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079643Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000079643Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079643Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000079643Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079643Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalBondIndex316_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex316Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalBondIndex316_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex316Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalBondIndex316_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex316Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalBondIndex316_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex316Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018798Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018798Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018799Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018799Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000194371Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194371Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000079644Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079644Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006930Member_PrincipalRisks2_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:PrincipalRisks2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006930Member_RiskLoseMoneyMember_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006930Member_RiskNotInsuredMember_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006930Member_InterestRate2_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:InterestRate2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006930Member_Credit2_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Credit2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006930Member_Liquidity2_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Liquidity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006930Member_TaxLegislativeandPoliticalChanges2_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:TaxLegislativeandPoliticalChanges2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006930Member_Tax-ExemptSecurities2_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Tax-ExemptSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006930Member_Market2_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Market2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006930Member_Connecticut2_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Connecticut2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006930Member_Focus2_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Focus2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006930Member_Income2_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Income2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006930Member_Prepayment2_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Prepayment2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006930Member_Inflation2_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Inflation2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006930Member_BondInsurers2_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:BondInsurers2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006930Member_UnratedDebtSecurities2_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:UnratedDebtSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006930Member_Non-Diversification2_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Non-Diversification2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006930Member_Management2_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Management2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006930Member_Cybersecurity2_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Cybersecurity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20161231_20161231_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-12-31</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Context_20171231_20171231_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-12-31</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Context_20181231_20181231_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-12-31</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Context_20191231_20191231_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-12-31</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Context_20201231_20201231_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-12-31</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Context_20211231_20211231_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-12-31</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Context_20221231_20221231_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-12-31</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Context_20231231_20231231_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-31</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Context_20241231_20241231_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-12-31</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Context_20251231_20251231_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-12-31</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205909Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205909Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018798Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018798Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018798Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018798Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018798Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018798Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018799Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018799Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018799Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018799Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018799Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018799Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000194371Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194371Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000194371Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194371Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000079644Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079644Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000079644Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079644Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000079644Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079644Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalBondIndex317_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex317Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalBondIndex317_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex317Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalBondIndex317_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex317Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalBondIndex317_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex317Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018771Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018771Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018773Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018773Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000194360Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194360Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000068549Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000068549Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006919Member_PrincipalRisks2_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:PrincipalRisks2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006919Member_RiskLoseMoneyMember_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006919Member_RiskNotInsuredMember_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006919Member_InterestRate2_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:InterestRate2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006919Member_Credit2_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Credit2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006919Member_Liquidity2_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Liquidity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006919Member_TaxLegislativeandPoliticalChanges2_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:TaxLegislativeandPoliticalChanges2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006919Member_Tax-ExemptSecurities2_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Tax-ExemptSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006919Member_Market2_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Market2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006919Member_Michigan2_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Michigan2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006919Member_Focus2_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Focus2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006919Member_Income2_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Income2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006919Member_Prepayment2_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Prepayment2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006919Member_Inflation2_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Inflation2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006919Member_BondInsurers2_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:BondInsurers2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006919Member_UnratedDebtSecurities2_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:UnratedDebtSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006919Member_Management2_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Management2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006919Member_Cybersecurity2_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Cybersecurity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20161231_20161231_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-12-31</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Context_20171231_20171231_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-12-31</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Context_20181231_20181231_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-12-31</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Context_20191231_20191231_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-12-31</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Context_20201231_20201231_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-12-31</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Context_20211231_20211231_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-12-31</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Context_20221231_20221231_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-12-31</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Context_20231231_20231231_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-31</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Context_20241231_20241231_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-12-31</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Context_20251231_20251231_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-12-31</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205898Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205898Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018771Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018771Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018771Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018771Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018771Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018771Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018773Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018773Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018773Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018773Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018773Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018773Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000194360Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194360Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000194360Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194360Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000068549Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000068549Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000068549Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000068549Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000068549Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000068549Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalBondIndex318_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex318Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalBondIndex318_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex318Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalBondIndex318_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex318Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalBondIndex318_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex318Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018774Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018774Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018775Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018775Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000194361Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194361Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000079637Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079637Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006920Member_PrincipalRisks2_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:PrincipalRisks2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006920Member_RiskLoseMoneyMember_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006920Member_RiskNotInsuredMember_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006920Member_InterestRate2_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:InterestRate2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006920Member_Credit2_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Credit2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006920Member_Liquidity2_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Liquidity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006920Member_TaxLegislativeandPoliticalChanges2_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:TaxLegislativeandPoliticalChanges2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006920Member_Tax-ExemptSecurities2_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Tax-ExemptSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006920Member_Market2_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Market2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006920Member_Minnesota2_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Minnesota2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006920Member_Focus2_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Focus2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006920Member_Income2_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Income2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006920Member_Prepayment2_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Prepayment2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006920Member_Inflation2_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Inflation2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006920Member_BondInsurers2_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:BondInsurers2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006920Member_UnratedDebtSecurities2_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:UnratedDebtSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006920Member_Management2_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Management2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006920Member_Cybersecurity2_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Cybersecurity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20161231_20161231_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-12-31</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Context_20171231_20171231_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-12-31</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Context_20181231_20181231_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-12-31</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Context_20191231_20191231_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-12-31</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Context_20201231_20201231_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-12-31</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Context_20211231_20211231_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-12-31</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Context_20221231_20221231_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-12-31</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Context_20231231_20231231_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-31</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Context_20241231_20241231_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-12-31</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Context_20251231_20251231_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-12-31</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205899Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205899Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018774Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018774Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018774Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018774Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018774Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018774Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018775Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018775Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018775Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018775Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018775Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018775Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000194361Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194361Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000194361Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194361Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000079637Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079637Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000079637Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079637Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000079637Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079637Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalBondIndex319_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex319Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalBondIndex319_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex319Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalBondIndex319_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex319Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalBondIndex319_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex319Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018786Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018786Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018788Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018788Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000194366Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194366Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000068552Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000068552Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006925Member_PrincipalRisks2_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:PrincipalRisks2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006925Member_RiskLoseMoneyMember_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006925Member_RiskNotInsuredMember_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006925Member_InterestRate2_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:InterestRate2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006925Member_Credit2_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Credit2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006925Member_Liquidity2_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Liquidity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006925Member_TaxLegislativeandPoliticalChanges2_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:TaxLegislativeandPoliticalChanges2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006925Member_Tax-ExemptSecurities2_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Tax-ExemptSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006925Member_Market2_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Market2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006925Member_Ohio2_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Ohio2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006925Member_Focus2_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Focus2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006925Member_Income2_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Income2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006925Member_Prepayment2_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Prepayment2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006925Member_Inflation2_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Inflation2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006925Member_BondInsurers2_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:BondInsurers2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006925Member_UnratedDebtSecurities2_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:UnratedDebtSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006925Member_Management2_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Management2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006925Member_Cybersecurity2_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Cybersecurity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20161231_20161231_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-12-31</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Context_20171231_20171231_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-12-31</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Context_20181231_20181231_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-12-31</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Context_20191231_20191231_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-12-31</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Context_20201231_20201231_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-12-31</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Context_20211231_20211231_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-12-31</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Context_20221231_20221231_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-12-31</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Context_20231231_20231231_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-31</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Context_20241231_20241231_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-12-31</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Context_20251231_20251231_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-12-31</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205904Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205904Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018786Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018786Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018786Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018786Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018786Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018786Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018788Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018788Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018788Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018788Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018788Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018788Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000194366Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194366Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000194366Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194366Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000068552Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000068552Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000068552Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000068552Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000068552Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000068552Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalBondIndex320_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex320Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalBondIndex320_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex320Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalBondIndex320_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex320Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalBondIndex320_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex320Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018789Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018789Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018790Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018790Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000194367Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194367Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000079640Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079640Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006926Member_PrincipalRisks2_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:PrincipalRisks2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006926Member_RiskLoseMoneyMember_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006926Member_RiskNotInsuredMember_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006926Member_InterestRate2_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:InterestRate2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006926Member_Credit2_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Credit2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006926Member_Liquidity2_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Liquidity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006926Member_TaxLegislativeandPoliticalChanges2_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:TaxLegislativeandPoliticalChanges2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006926Member_Tax-ExemptSecurities2_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Tax-ExemptSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006926Member_Market2_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Market2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006926Member_Oregon2_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Oregon2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006926Member_Focus2_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Focus2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006926Member_Income2_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Income2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006926Member_Prepayment2_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Prepayment2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006926Member_Inflation2_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Inflation2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006926Member_BondInsurers2_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:BondInsurers2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006926Member_UnratedDebtSecurities2_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:UnratedDebtSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006926Member_Management2_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Management2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006926Member_Cybersecurity2_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Cybersecurity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20161231_20161231_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-12-31</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Context_20171231_20171231_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-12-31</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Context_20181231_20181231_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-12-31</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Context_20191231_20191231_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-12-31</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Context_20201231_20201231_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-12-31</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Context_20211231_20211231_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-12-31</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Context_20221231_20221231_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-12-31</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Context_20231231_20231231_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-31</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Context_20241231_20241231_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-12-31</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Context_20251231_20251231_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-12-31</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205905Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205905Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018789Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018789Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018789Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018789Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018789Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018789Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018790Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018790Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018790Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018790Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018790Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018790Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000194367Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194367Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000194367Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194367Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000079640Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079640Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000079640Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079640Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000079640Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079640Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalBondIndex321_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex321Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalBondIndex321_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex321Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalBondIndex321_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex321Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalBondIndex321_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex321Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018791Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018791Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000018793Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018793Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000194368Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194368Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_C000079641Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079641Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006927Member_PrincipalRisks2_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:PrincipalRisks2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006927Member_RiskLoseMoneyMember_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskLoseMoneyMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006927Member_RiskNotInsuredMember_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">oef:RiskNotInsuredMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006927Member_InterestRate2_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:InterestRate2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006927Member_Credit2_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Credit2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006927Member_Liquidity2_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Liquidity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006927Member_TaxLegislativeandPoliticalChanges2_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:TaxLegislativeandPoliticalChanges2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006927Member_Tax-ExemptSecurities2_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Tax-ExemptSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006927Member_Market2_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Market2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006927Member_Pennsylvania2_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Pennsylvania2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006927Member_Focus2_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Focus2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006927Member_Income2_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Income2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006927Member_Prepayment2_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Prepayment2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006927Member_Inflation2_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Inflation2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006927Member_BondInsurers2_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:BondInsurers2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006927Member_UnratedDebtSecurities2_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:UnratedDebtSecurities2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006927Member_Management2_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Management2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_S000006927Member_Cybersecurity2_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:RiskAxis">cik0000757010:Cybersecurity2Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20161231_20161231_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-12-31</startDate>
            <endDate>2016-12-31</endDate>
        </period>
    </context>
    <context id="Context_20171231_20171231_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-12-31</startDate>
            <endDate>2017-12-31</endDate>
        </period>
    </context>
    <context id="Context_20181231_20181231_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2018-12-31</startDate>
            <endDate>2018-12-31</endDate>
        </period>
    </context>
    <context id="Context_20191231_20191231_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-12-31</startDate>
            <endDate>2019-12-31</endDate>
        </period>
    </context>
    <context id="Context_20201231_20201231_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2020-12-31</startDate>
            <endDate>2020-12-31</endDate>
        </period>
    </context>
    <context id="Context_20211231_20211231_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-12-31</startDate>
            <endDate>2021-12-31</endDate>
        </period>
    </context>
    <context id="Context_20221231_20221231_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2022-12-31</startDate>
            <endDate>2022-12-31</endDate>
        </period>
    </context>
    <context id="Context_20231231_20231231_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2023-12-31</startDate>
            <endDate>2023-12-31</endDate>
        </period>
    </context>
    <context id="Context_20241231_20241231_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2024-12-31</startDate>
            <endDate>2024-12-31</endDate>
        </period>
    </context>
    <context id="Context_20251231_20251231_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-12-31</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205906Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000205906Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">oef:AfterTaxesOnDistributionsAndSalesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018791Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018791Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018791Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018791Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018791Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018791Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000018793Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018793Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000018793Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018793Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000018793Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000018793Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000194368Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194368Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000194368Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194368Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_C000079641Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079641Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_C000079641Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079641Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_C000079641Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000079641Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20260228_20260228_BloombergMunicipalBondIndex322_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex322Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-02-28</startDate>
            <endDate>2026-02-28</endDate>
        </period>
    </context>
    <context id="Context_20250101_20251231_BloombergMunicipalBondIndex322_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex322Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20210101_20251231_BloombergMunicipalBondIndex322_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex322Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2021-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20160101_20251231_BloombergMunicipalBondIndex322_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:PerformanceMeasureAxis">cik0000757010:BloombergMunicipalBondIndex322Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2016-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20170801_20251231_C000194372Member_S000006932Member_S000006932Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006932Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194372Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-08-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20170801_20251231_C000194373Member_S000006933Member_S000006933Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006933Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194373Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-08-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20170801_20251231_C000194355Member_S000006913Member_S000006913Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006913Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194355Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-08-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20170801_20251231_C000194359Member_S000006918Member_S000006918Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006918Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194359Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-08-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20170801_20251231_C000194364Member_S000006923Member_S000006923Summary1Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006923Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194364Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-08-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20170801_20251231_C000194353Member_S000006911Member_S000006911Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006911Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194353Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-08-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20170801_20251231_C000194354Member_S000006912Member_S000006912Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006912Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194354Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-08-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20170801_20251231_C000194357Member_S000006916Member_S000006916Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006916Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194357Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-08-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20170801_20251231_C000194358Member_S000006917Member_S000006917Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006917Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194358Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-08-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20170801_20251231_C000194362Member_S000006921Member_S000006921Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006921Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194362Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-08-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20170801_20251231_C000194365Member_S000006924Member_S000006924Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006924Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194365Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-08-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20170801_20251231_C000194369Member_S000006928Member_S000006928Summary2Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006928Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194369Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-08-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20170801_20251231_C000194363Member_S000006922Member_S000006922Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006922Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194363Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-08-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20170801_20251231_C000194370Member_S000006929Member_S000006929Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006929Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194370Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-08-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20170801_20251231_C000194371Member_S000006930Member_S000006930Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006930Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194371Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-08-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20170801_20251231_C000194360Member_S000006919Member_S000006919Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006919Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194360Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-08-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20170801_20251231_C000194361Member_S000006920Member_S000006920Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006920Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194361Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-08-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20170801_20251231_C000194366Member_S000006925Member_S000006925Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006925Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194366Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-08-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20170801_20251231_C000194367Member_S000006926Member_S000006926Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006926Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194367Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-08-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="Context_20170801_20251231_C000194368Member_S000006927Member_S000006927Summary3Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000757010</identifier>
            <segment>
                <xbrldi:explicitMember dimension="dei:LegalEntityAxis">cik0000757010:S000006927Member</xbrldi:explicitMember>
                <xbrldi:explicitMember dimension="oef:ClassAxis">cik0000757010:C000194368Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2017-08-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <unit id="usd">
        <measure>iso4217:USD</measure>
    </unit>
    <unit id="pure">
        <measure>pure</measure>
    </unit>
    <dei:EntityInvCompanyType contextRef="Context_20260228_20260228" id="ixv-110028">N-1A</dei:EntityInvCompanyType>
    <dei:EntityRegistrantName contextRef="Context_20260228_20260228" id="ixv-110029">FRANKLIN TAX FREE TRUST</dei:EntityRegistrantName>
    <oef:ProspectusDate contextRef="Context_20260228_20260228" id="ixv-110030">2026-07-01</oef:ProspectusDate>
    <oef:RiskReturnHeading
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-110031">Franklin 
Federal Intermediate-Term Tax-Free Income Fund</oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-110032">Investment 
Goal</oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-514">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;To 
provide investors with as high a level of income exempt from federal income taxes as is consistent with 
prudent investment management and the preservation of shareholders&#x2019; capital.&lt;/p&gt;</oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-110033">Fees 
and Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-518">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;These tables describe the fees and expenses that you may pay 
if you buy, hold and sell shares of the Fund. &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;You may pay other fees (including on Class 
R6 and Advisor Class shares), such as brokerage commissions and other fees to financial intermediaries, 
which are not reflected in the tables and examples below.&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; You may qualify for sales charge discounts 
in Class A if you and your family invest, or agree to invest in the future, at least $100,000 in Franklin 
Templeton funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s 
distributor. More information about these and other discounts is available from your financial professional 
and under &#x201c;Your Account&#x201d; on page 94 in the Fund&#x2019;s Prospectus and under &#x201c;Buying 
and Selling Shares&#x201d; on page 53 of the Fund&#x2019;s Statement of Additional Information. In addition, 
more information about sales charge discounts and waivers for purchases of shares through specific financial 
intermediaries is set forth in Appendix A &#x2013; &#x201c;Intermediary Sales Charge Discounts and Waivers&#x201d; 
to the Fund&#x2019;s prospectus.&lt;/span&gt;&lt;/p&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-110034">You may qualify for sales charge discounts 
in Class A if you and your family invest, or agree to invest in the future, at least $100,000 in Franklin 
Templeton funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s 
distributor.</oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110035"
      unitRef="usd">100000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-110036">Shareholder Fees</oef:ShareholderFeesCaption>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110037"
      unitRef="pure">0.0225</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018802Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110038"
      unitRef="pure">0.0225</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018803Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110039"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194372Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110040"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000074134Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110041"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="_24_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018802Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="_25_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018803Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110044"
      unitRef="pure">0.0100</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194372Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110045"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000074134Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110046"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:OperatingExpensesCaption
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-110047">Annual 
Fund Operating Expenses (expenses that you pay each year as a percentage of the value 
of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110048"
      unitRef="pure">0.0046</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018802Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110049"
      unitRef="pure">0.0046</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018803Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110050"
      unitRef="pure">0.0046</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000194372Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110051"
      unitRef="pure">0.0046</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000074134Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110052"
      unitRef="pure">0.0046</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110053"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018802Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110054"
      unitRef="pure">0.0010</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018803Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110055"
      unitRef="pure">0.0065</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000194372Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110056"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000074134Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110057"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110058"
      unitRef="pure">0.0012</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018802Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110059"
      unitRef="pure">0.0012</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018803Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110060"
      unitRef="pure">0.0012</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194372Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110061"
      unitRef="pure">0.0005</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000074134Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110062"
      unitRef="pure">0.0012</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110063"
      unitRef="pure">0.0083</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018802Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110064"
      unitRef="pure">0.0068</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018803Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110065"
      unitRef="pure">0.0123</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194372Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110066"
      unitRef="pure">0.0051</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000074134Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110067"
      unitRef="pure">0.0058</oef:ExpensesOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="_50_"
      unitRef="pure">-0.0012</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000018802Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="_51_"
      unitRef="pure">-0.0012</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000018803Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="_52_"
      unitRef="pure">-0.0012</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000194372Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="_53_"
      unitRef="pure">-0.0011</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000074134Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="_54_"
      unitRef="pure">-0.0012</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110073"
      unitRef="pure">0.0071</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018802Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110074"
      unitRef="pure">0.0056</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018803Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110075"
      unitRef="pure">0.0111</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194372Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110076"
      unitRef="pure">0.0040</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000074134Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110077"
      unitRef="pure">0.0046</oef:NetExpensesOverAssets>
    <oef:ExpenseExampleHeading
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-110078">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-845">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;This 
Example is intended to help you compare the cost of investing in the Fund with the cost of investing 
in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated 
and then redeem all of your shares at the end of the period. The Example also assumes that your investment 
has a 5% return each year and that the Fund's operating expenses remain the same. The Example reflects 
adjustments made to the Fund's operating expenses due to the fee waivers and/or expense reimbursements 
by management for the 1 Year numbers only. Although your actual costs may be higher or lower, based on 
these assumptions your costs would be:&lt;/p&gt;</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110079"
      unitRef="usd">296</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110080"
      unitRef="usd">472</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110081"
      unitRef="usd">664</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110082"
      unitRef="usd">1217</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018802Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110083"
      unitRef="usd">281</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018802Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110084"
      unitRef="usd">426</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018802Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110085"
      unitRef="usd">584</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018802Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110086"
      unitRef="usd">1041</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018803Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110087"
      unitRef="usd">213</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018803Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110088"
      unitRef="usd">378</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018803Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110089"
      unitRef="usd">663</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018803Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110090"
      unitRef="usd">1367</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000194372Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110091"
      unitRef="usd">41</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000194372Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110092"
      unitRef="usd">153</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000194372Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110093"
      unitRef="usd">275</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000194372Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110094"
      unitRef="usd">631</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000074134Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110095"
      unitRef="usd">47</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000074134Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110096"
      unitRef="usd">174</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000074134Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110097"
      unitRef="usd">313</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000074134Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110098"
      unitRef="usd">716</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionByYearCaption
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-110099">If you do not sell your shares:</oef:ExpenseExampleNoRedemptionByYearCaption>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Context_20260228_20260228_C000018803Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110100"
      unitRef="usd">113</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Context_20260228_20260228_C000018803Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110101"
      unitRef="usd">378</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Context_20260228_20260228_C000018803Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110102"
      unitRef="usd">663</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Context_20260228_20260228_C000018803Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110103"
      unitRef="usd">1367</oef:ExpenseExampleNoRedemptionYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-110104">Portfolio 
Turnover</oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-1050">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities 
(or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs 
and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are 
not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During 
the most recent fiscal year, the Fund's portfolio turnover rate was 27.20% of the average value of its 
portfolio.&lt;/p&gt;</oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110105"
      unitRef="pure">0.2720</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-110106">Principal Investment Strategies</oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-1054">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Under 
normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax. &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the Fund tries 
to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's total 
assets may be in securities that pay interest that may be subject to the federal alternative minimum 
tax and in securities that pay interest subject to other federal or state income taxes.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the Fund does 
not have restrictions on the maturity of the securities it may buy, the Fund does maintain a dollar-weighted 
average portfolio maturity of six to 12 years.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund only buys municipal securities rated, at the time 
of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized rating 
services (or unrated or short-term rated securities of comparable credit quality).&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund does not necessarily 
focus its investments in a particular state. The Fund may invest up to 35% of its total assets in municipal 
securities issued by U.S. territories.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the investment manager will search for investments 
across a large number of municipal securities that finance different types of projects, from time to 
time, based on economic conditions, the Fund may have significant positions in municipal securities that 
finance similar types of projects.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The investment manager selects securities that it believes 
will provide the best balance between risk and return within the Fund&#x2019;s range of allowable investments 
and typically invests with a long-term time horizon. This means it generally holds securities in the 
Fund&#x2019;s portfolio for income purposes, although the investment manager may sell a security at any 
time if it believes it could help the Fund meet its goal. With a focus on income, individual securities 
are considered for purchase or sale based on various factors and considerations, including credit profile, 
risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading 
and tax loss harvesting opportunities.&lt;/p&gt;</oef:StrategyNarrativeTextBlock>
    <oef:StrategyPortfolioConcentration
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-1055">Under 
normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax. </oef:StrategyPortfolioConcentration>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-110107">Under 
normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax</fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-110108">Under 
normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax</fnd:NmRule35d1TermDfnSmryTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_PrincipalRisks2_S000006932Summary1Member"
      id="ixv-1081">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:13.0pt; font-family:Arial; text-align:left; color:#004C97; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:13.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:normal; text-decoration:none;"&gt;Principal 
Risks&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;You 
could lose money by investing in the Fund. Mutual fund shares are not deposits or obligations of, or 
guaranteed or endorsed by, any bank, and are not insured by the Federal Deposit Insurance Corporation, 
the Federal Reserve Board, or any other agency of the U.S. government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_RiskLoseMoneyMember_S000006932Summary1Member"
      id="ixv-110109">You 
could lose money by investing in the Fund.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_RiskNotInsuredMember_S000006932Summary1Member"
      id="ixv-110110">Mutual fund shares are not deposits or obligations of, or 
guaranteed or endorsed by, any bank, and are not insured by the Federal Deposit Insurance Corporation, 
the Federal Reserve Board, or any other agency of the U.S. government.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_InterestRate2_S000006932Summary1Member"
      id="ixv-1085">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Interest 
Rate:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 When interest rates rise, debt security prices generally fall. The opposite is also generally true: 
debt security prices rise when interest rates fall. Interest rate changes are influenced by a number 
of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, 
and supply of and demand for bonds. In general, securities with longer maturities or durations are more 
sensitive to interest rate changes. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_Credit2_S000006932Summary1Member"
      id="ixv-1089">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Credit:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  An issuer of debt securities may fail 
to make interest payments or repay principal when due, in whole or in part. Changes in an issuer's financial 
strength or in a security's or government's credit rating may affect a security's value. A change in 
the credit rating of a municipal bond insurer that insures securities in the Fund&#x2019;s portfolio may 
affect the value of the securities it insures, the Fund&#x2019;s share price and Fund performance. The 
Fund might also be adversely impacted by the inability of an insurer to meet its insurance obligations.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_Liquidity2_S000006932Summary1Member"
      id="ixv-1093">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The trading market for a particular security or type of security or other investments in which the Fund 
invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the 
Fund&#x2019;s ability to sell such securities or other investments when necessary to meet the Fund&#x2019;s 
liquidity needs, which may arise or increase in response to a specific economic event or because the 
investment manager wishes to purchase particular investments or believes that a higher level of liquidity 
would be advantageous. Reduced liquidity will also generally lower the value of such securities or other 
investments. Market prices for such securities or other investments may be relatively volatile.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_TaxLegislativeandPoliticalChanges2_S000006932Summary1Member"
      id="ixv-1097">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax 
Legislative and Political Changes:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The municipal securities market could be significantly affected 
by adverse political and legislative changes or litigation at the federal or state level. The value of 
municipal bonds is closely tied to the benefits of tax-exempt income to investors. Significant revisions 
of federal income tax laws or regulations revising income tax rates or the tax-exempt character of municipal 
bonds, or even proposed changes and deliberations on this topic by the federal government, could cause 
municipal bond prices to fall. For example, lower federal income tax rates would reduce certain relative 
advantages of owning municipal bonds, and lower state income tax rates could have similar effects. In 
addition, the application of corporate minimum tax rates to financial statement income may have the effect 
of reducing demand for municipal bonds among corporate investors, which may in turn impact municipal 
bond prices.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_Tax-ExemptSecurities2_S000006932Summary1Member"
      id="ixv-1119">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax-Exempt 
Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Failure of a municipal security issuer to comply with applicable tax requirements 
may make income paid thereon taxable, resulting in a decline in the security&#x2019;s value. In addition, 
there could be changes in applicable tax laws or tax treatments that reduce or eliminate the current 
federal income tax exemption on municipal securities or otherwise adversely affect the current federal 
or state tax status of municipal securities.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_Market2_S000006932Summary1Member"
      id="ixv-1123">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Market:  &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The market values of 
securities or other investments owned by the Fund will go up or down, sometimes rapidly or unpredictably. 
The market value of a security or other investment may be reduced by market activity or other results 
of supply and demand unrelated to the issuer. This is a basic risk associated with all investments. When 
there are more sellers than buyers, prices tend to fall. Likewise, when there are more buyers than sellers, 
prices tend to rise. In addition, the value of the Fund&#x2019;s investments may go up or down due to 
general market or other conditions that are not specifically related to a particular issuer, such as: 
real or perceived adverse economic changes, including widespread liquidity issues and defaults in one 
or more industries; changes in interest, inflation or exchange rates; unexpected natural and man-made 
world events, such as diseases or disasters; financial, political or social disruptions, including terrorism 
and war; and U.S. trade disputes or other disputes with specific countries that could result in additional 
tariffs, trade barriers and/or investment restrictions in certain securities in those countries. Any 
of these conditions can adversely affect the economic prospects of many companies, sectors, nations, 
regions and the market in general, in ways that cannot necessarily be foreseen.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Ongoing or threatened 
armed conflicts throughout the world have caused and could continue to cause significant market disruptions 
and volatility. The hostilities and sanctions resulting from those hostilities could have a significant 
impact on certain investments of the Fund as well as the Fund&#x2019;s performance and liquidity.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_States2_S000006932Summary1Member"
      id="ixv-1128">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;States:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund&#x2019;s portfolio is generally widely diversified among issuers of municipal securities. However, 
to the extent that the Fund has exposure from time to time to the municipal securities of a particular 
state, events in that state may affect the Fund&#x2019;s investments and performance. These events may 
include economic or political policy changes, tax base erosion, unfunded pension and healthcare liabilities, 
constitutional limits on tax increases, budget deficits and other financial difficulties, and changes 
in the credit ratings assigned to municipal issuers of the state. The same is true of events in U.S. 
territories, to the extent that the Fund has exposure to any particular territory at any given time.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_Focus2_S000006932Summary1Member"
      id="ixv-1132">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Focus:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund may invest more than 25% of its assets in municipal securities that finance similar types of 
projects, such as utilities, hospitals, higher education and transportation. A change that affects one 
project, such as proposed legislation on the financing of the project, a shortage of the materials needed 
for the project, &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;or 
a declining need for the project, would likely affect all similar projects, thereby increasing market 
risk.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_Income2_S000006932Summary1Member"
      id="ixv-1156">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Income:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund's distributions to shareholders may decline when prevailing interest rates fall, when the Fund 
experiences defaults on debt securities it holds or when the Fund realizes a loss upon the sale of a 
debt security. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_Prepayment2_S000006932Summary1Member"
      id="ixv-1160">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Prepayment:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Prepayment risk occurs when a debt security 
can be repaid in whole or in part prior to the security's maturity and the Fund must reinvest the proceeds 
it receives, during periods of declining interest rates, in securities that pay a lower rate of interest. 
Also, if a security has been purchased at a premium, the value of the premium would be lost in the event 
of prepayment. Prepayments generally increase when interest rates fall.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_Inflation2_S000006932Summary1Member"
      id="ixv-1164">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Inflation:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt; 
 &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The 
market price of debt securities generally falls as inflation increases because the purchasing power of 
the future income and repaid principal is expected to be worth less when received by the Fund. Debt securities 
that pay a fixed rather than variable interest rate are especially vulnerable to inflation risk because 
variable-rate debt securities may be able to participate, over the long term, in rising interest rates 
which have historically corresponded with long-term inflationary trends.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_BondInsurers2_S000006932Summary1Member"
      id="ixv-1169">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Bond Insurers:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Market conditions or changes to ratings criteria could adversely impact the ratings of municipal bond 
insurance companies. Downgrades and withdrawal of ratings from municipal bond insurers have substantially 
limited the availability of insurance sought by municipal bond issuers thereby reducing the supply of 
insured municipal securities.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because of the consolidation among municipal bond insurers 
the Fund is subject to additional risks including the risk that credit risk may be concentrated among 
fewer insurers and the risk that events involving one or more municipal bond insurers could have a significant 
adverse effect on the value of the securities insured by an insurer and on the municipal markets as a 
whole.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_UnratedDebtSecurities2_S000006932Summary1Member"
      id="ixv-1174">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Unrated 
Debt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Certain unrated debt securities determined by the investment manager to be of 
comparable credit quality to rated securities which the Fund may purchase may pay a higher interest rate 
than such rated debt securities and be subject to a greater risk of illiquidity or price changes. Less 
public information and independent credit analysis are typically available about unrated securities or 
issuers, and therefore they may be subject to greater risk of default.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_Management2_S000006932Summary1Member"
      id="ixv-1178">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Management:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund is subject to management risk because it is an actively managed investment portfolio. The Fund's 
investment manager applies investment techniques and risk analyses in making investment decisions for 
the Fund, but there can be no guarantee that these decisions will produce the desired results.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_Cybersecurity2_S000006932Summary1Member"
      id="ixv-1200">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Cybersecurity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain 
access to Fund assets, Fund or customer data (including private shareholder information), or proprietary 
information, cause the Fund, the investment manager, and/or their service providers (including, but not 
limited to, Fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) 
to suffer data breaches, data corruption or loss of operational functionality or prevent Fund investors 
from purchasing, redeeming or exchanging shares or receiving distributions. The investment manager has 
limited ability to prevent or mitigate cybersecurity incidents affecting third party service providers, 
and such third party service providers may have limited indemnification obligations to the Fund or the 
investment manager. Cybersecurity incidents may result in financial losses to the Fund and its shareholders, 
and substantial costs may be incurred in an effort to prevent or mitigate future cybersecurity incidents. 
Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value 
of these securities could decline if the issuers experience cybersecurity incidents.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because technology is 
frequently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a 
chance that some risks have not been identified or prepared for, or that an attack may not be detected, 
which puts limitations on the Fund's ability to plan for or respond to a cyber attack. Like other funds 
and business enterprises, the Fund, the investment manager, and their service providers are subject to 
the risk of cyber incidents occurring from time to time.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-110111">Performance</oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-1207">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
following bar chart and table provide some indication of the risks of investing in the Fund. The bar 
chart shows changes in the Fund's performance from year to year for Class A shares. The table shows how 
the Fund's average annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared 
with those of a broad measure of market performance and an additional index with characteristics relevant 
to the Fund. The Fund's past performance (before and after taxes) is not necessarily an indication of 
how the Fund will perform in the future. You can obtain updated performance information at www.franklintempleton.com 
or by calling (800) DIAL BEN/342-5236.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Sales charges are not reflected in the bar chart, and if those 
charges were included, returns would be less than those shown.&lt;/p&gt;</oef:PerformanceNarrativeTextBlock>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-110112">The Fund's past performance (before and after taxes) is not necessarily an indication of 
how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-110113">franklintempleton.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:PerformanceAvailabilityPhone
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-110114">(800) DIAL BEN/342-5236</oef:PerformanceAvailabilityPhone>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-110115">Sales charges are not reflected in the bar chart, and if those 
charges were included, returns would be less than those shown.</oef:BarChartDoesNotReflectSalesLoads>
    <oef:BarChartHeading
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-110116">Class A Annual Total Returns</oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-1231">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:17.33%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:68%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.67%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Best Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2023, Q4&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;6.35%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Worst Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2022, Q1&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;-5.85%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="2" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:100%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; font-size:1pt;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.08%.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
</oef:BarChartClosingTextBlock>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      id="ixv-110117">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      id="ixv-110118">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110119"
      unitRef="pure">0.0635</oef:BarChartHighestQuarterlyReturn>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      id="ixv-110120">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      id="ixv-110121">2022-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110122"
      unitRef="pure">-0.0585</oef:BarChartLowestQuarterlyReturn>
    <oef:YearToDateReturnLabel
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      id="ixv-110123">As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.08%.</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturnDate
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      id="ixv-110124">2026-03-31</oef:BarChartYearToDateReturnDate>
    <oef:BarChartYearToDateReturn
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110125"
      unitRef="pure">-0.0008</oef:BarChartYearToDateReturn>
    <oef:PerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-110126">Average 
Annual Total Returns (figures reflect sales charges) For periods ended December 
31, 2025</oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      id="ixv-110127">Return before taxes</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110128"
      unitRef="pure">0.0233</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110129"
      unitRef="pure">0.0041</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110130"
      unitRef="pure">0.0144</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205910Member_S000006932Member_S000006932Summary1Member"
      id="ixv-110131">Return after taxes on distributions</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110132"
      unitRef="pure">0.0225</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110133"
      unitRef="pure">0.0037</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110134"
      unitRef="pure">0.0142</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205910Member_S000006932Member_S000006932Summary1Member"
      id="ixv-110135">Return after taxes on distributions and sale of Fund shares</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110136"
      unitRef="pure">0.0259</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110137"
      unitRef="pure">0.0084</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110138"
      unitRef="pure">0.0164</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018802Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110139"
      unitRef="pure">0.0239</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018802Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110140"
      unitRef="pure">0.0057</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018802Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110141"
      unitRef="pure">0.0153</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018803Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110142"
      unitRef="pure">0.0326</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018803Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110143"
      unitRef="pure">0.0046</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018803Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110144"
      unitRef="pure">0.0121</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000194372Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110145"
      unitRef="pure">0.0491</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000194372Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110146"
      unitRef="pure">0.0117</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20170801_20251231_C000194372Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="_167_"
      unitRef="pure">0.0193</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000074134Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110148"
      unitRef="pure">0.0485</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000074134Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110149"
      unitRef="pure">0.0112</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000074134Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110150"
      unitRef="pure">0.0187</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalBondIndex31_S000006932Member_S000006932Summary1Member"
      id="ixv-110151">Bloomberg Municipal Bond Index </oef:AverageAnnualReturnLabel>
    <oef:IndexNoDeductionForFeesExpensesTaxes
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-110152">(index reflects no deduction 
for fees, expenses or taxes)</oef:IndexNoDeductionForFeesExpensesTaxes>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalBondIndex31_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110153"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalBondIndex31_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110154"
      unitRef="pure">0.0080</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalBondIndex31_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110155"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipal1-15YearIndex32_S000006932Member_S000006932Summary1Member"
      id="ixv-110156">Bloomberg Municipal 1-15 Year Index </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipal1-15YearIndex32_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110157"
      unitRef="pure">0.0518</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipal1-15YearIndex32_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110158"
      unitRef="pure">0.0116</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipal1-15YearIndex32_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-110159"
      unitRef="pure">0.0227</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-110160">Franklin 
Federal Limited-Term Tax-Free Income Fund</oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-110161">Investment Goal</oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-1638">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;To provide investors with 
as high a level of income exempt from federal income taxes as is consistent with prudent investment management 
and the preservation of shareholders&#x2019; capital.&lt;/p&gt;</oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-110162">Fees and Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-1641">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;These 
tables describe the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. 
&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;You 
may pay other fees (including on Class R6 and Advisor Class shares), such as brokerage commissions and 
other fees to financial intermediaries, which are not reflected in the tables and examples below.&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest 
in the future, at least $100,000 in Franklin Templeton funds and certain other funds distributed through 
Franklin Distributors, LLC, the Fund&#x2019;s distributor. More information about these and other discounts 
is available from your financial professional and under &#x201c;Your Account&#x201d; on page 94 in the 
Fund&#x2019;s Prospectus and under &#x201c;Buying and Selling Shares&#x201d; on page 53 of the Fund&#x2019;s 
Statement of Additional Information. In addition, more information about sales charge discounts and waivers 
for purchases of shares through specific financial intermediaries is set forth in Appendix A &#x2013; 
&#x201c;Intermediary Sales Charge Discounts and Waivers&#x201d; to the Fund&#x2019;s prospectus.&lt;/span&gt;&lt;/p&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-110163">You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest 
in the future, at least $100,000 in Franklin Templeton funds and certain other funds distributed through 
Franklin Distributors, LLC, the Fund&#x2019;s distributor.</oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110164"
      unitRef="usd">100000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-110165">Shareholder 
Fees</oef:ShareholderFeesCaption>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110166"
      unitRef="pure">0.0225</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018804Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110167"
      unitRef="pure">0.0225</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194373Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110168"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000096868Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110169"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="_193_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018804Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="_194_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194373Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110172"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000096868Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110173"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:OperatingExpensesCaption
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-110174">Annual 
Fund Operating Expenses (expenses that you pay each year as a percentage of the value 
of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110175"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018804Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110176"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000194373Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110177"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000096868Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110178"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110179"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018804Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110180"
      unitRef="pure">0.0015</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000194373Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110181"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000096868Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110182"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110183"
      unitRef="pure">0.0013</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018804Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110184"
      unitRef="pure">0.0013</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194373Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110185"
      unitRef="pure">0.0006</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000096868Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110186"
      unitRef="pure">0.0013</oef:OtherExpensesOverAssets>
    <oef:AcquiredFundFeesAndExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110187"
      unitRef="pure">0.0001</oef:AcquiredFundFeesAndExpensesOverAssets>
    <oef:AcquiredFundFeesAndExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018804Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110188"
      unitRef="pure">0.0001</oef:AcquiredFundFeesAndExpensesOverAssets>
    <oef:AcquiredFundFeesAndExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194373Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110189"
      unitRef="pure">0.0001</oef:AcquiredFundFeesAndExpensesOverAssets>
    <oef:AcquiredFundFeesAndExpensesOverAssets
      contextRef="Context_20260228_20260228_C000096868Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110190"
      unitRef="pure">0.0001</oef:AcquiredFundFeesAndExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="_214_"
      unitRef="pure">0.0087</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018804Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="_215_"
      unitRef="pure">0.0077</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194373Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="_216_"
      unitRef="pure">0.0055</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000096868Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="_217_"
      unitRef="pure">0.0062</oef:ExpensesOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="_218_"
      unitRef="pure">-0.0021</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000018804Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="_219_"
      unitRef="pure">-0.0021</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000194373Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="_220_"
      unitRef="pure">-0.0017</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000096868Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="_221_"
      unitRef="pure">-0.0021</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110199"
      unitRef="pure">0.0066</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018804Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110200"
      unitRef="pure">0.0056</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194373Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110201"
      unitRef="pure">0.0038</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000096868Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110202"
      unitRef="pure">0.0041</oef:NetExpensesOverAssets>
    <oef:ExpenseExampleHeading
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-110203">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-1941">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;This Example is intended to help you compare 
the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes 
that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares 
at the end of the period. The Example also assumes that your investment has a 5% return each year and 
that the Fund's operating expenses remain the same. The Example reflects adjustments made to the Fund's 
operating expenses due to the fee waivers and/or expense reimbursements by management for the 1 Year 
numbers only. Although your actual costs may be higher or lower, based on these assumptions your costs 
would be:&lt;/p&gt;</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110204"
      unitRef="usd">291</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110205"
      unitRef="usd">476</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110206"
      unitRef="usd">676</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110207"
      unitRef="usd">1253</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018804Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110208"
      unitRef="usd">281</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018804Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110209"
      unitRef="usd">445</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018804Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110210"
      unitRef="usd">623</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018804Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110211"
      unitRef="usd">1139</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000194373Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110212"
      unitRef="usd">39</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000194373Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110213"
      unitRef="usd">159</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000194373Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110214"
      unitRef="usd">290</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000194373Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110215"
      unitRef="usd">672</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000096868Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110216"
      unitRef="usd">42</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000096868Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110217"
      unitRef="usd">177</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000096868Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110218"
      unitRef="usd">324</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000096868Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110219"
      unitRef="usd">753</oef:ExpenseExampleYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-110220">Portfolio 
Turnover</oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-2072">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities 
(or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs 
and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are 
not reflected in annual Fund operating &lt;/p&gt;

&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;expenses 
or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio 
turnover rate was 33.07% of the average value of its portfolio.&lt;/p&gt;</oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110221"
      unitRef="pure">0.3307</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-110222">Principal 
Investment Strategies</oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-2095">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Under normal market conditions, the Fund invests at least 80% of its total assets 
in securities whose interest is free from federal income taxes, including the federal alternative minimum 
tax. &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although 
the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the 
Fund's total assets may be in securities that pay interest that may be subject to the federal alternative 
minimum tax and in securities that pay interest subject to other federal or state income taxes.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although 
the Fund does not have restrictions on the maturity of the securities it may buy, the Fund does maintain 
a dollar-weighted average portfolio maturity of five years or less.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund only buys municipal securities rated, 
at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized 
rating services (or unrated or short-term rated securities of comparable credit quality).&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund does not necessarily 
focus its investments in a particular state. The Fund may invest up to 35% of its total assets in municipal 
securities issued by U.S. territories.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the investment manager will search for investments 
across a large number of municipal securities that finance different types of projects, from time to 
time, based on economic conditions, the Fund may have significant positions in municipal securities that 
finance similar types of projects.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The investment manager selects securities that it believes 
will provide the best balance between risk and return within the Fund&#x2019;s range of allowable investments 
and typically invests with a long-term time horizon. This means it generally holds securities in the 
Fund&#x2019;s portfolio for income purposes, although the investment manager may sell a security at any 
time if it believes it could help the Fund meet its goal. With a focus on income, individual securities 
are considered for purchase or sale based on various factors and considerations, including credit profile, 
risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading 
and tax loss harvesting opportunities.&lt;/p&gt;</oef:StrategyNarrativeTextBlock>
    <oef:StrategyPortfolioConcentration
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-2096">Under normal market conditions, the Fund invests at least 80% of its total assets 
in securities whose interest is free from federal income taxes, including the federal alternative minimum 
tax. </oef:StrategyPortfolioConcentration>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-110223">Under normal market conditions, the Fund invests at least 80% of its total assets 
in securities whose interest is free from federal income taxes, including the federal alternative minimum 
tax</fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-110224">Under normal market conditions, the Fund invests at least 80% of its total assets 
in securities whose interest is free from federal income taxes, including the federal alternative minimum 
tax</fnd:NmRule35d1TermDfnSmryTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_PrincipalRisks2_S000006933Summary1Member"
      id="ixv-2104">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:13.0pt; font-family:Arial; text-align:left; color:#004C97; font-weight:normal; text-decoration:none;"&gt;Principal Risks&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;You could lose money by 
investing in the Fund. Mutual fund shares are not deposits or obligations of, or guaranteed or endorsed 
by, any bank, and are not &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_RiskLoseMoneyMember_S000006933Summary1Member"
      id="ixv-110225">You could lose money by 
investing in the Fund.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_RiskNotInsuredMember_S000006933Summary1Member"
      id="ixv-110226">Mutual fund shares are not deposits or obligations of, or guaranteed or endorsed 
by, any bank, and are not &lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_InterestRate2_S000006933Summary1Member"
      id="ixv-2128">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Interest 
Rate:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 When interest rates rise, debt security prices generally fall. The opposite is also generally true: 
debt security prices rise when interest rates fall. Interest rate changes are influenced by a number 
of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, 
and supply of and demand for bonds. In general, securities with longer maturities or durations are more 
sensitive to interest rate changes. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_Credit2_S000006933Summary1Member"
      id="ixv-2132">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Credit:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  An issuer of debt securities may fail 
to make interest payments or repay principal when due, in whole or in part. Changes in an issuer's financial 
strength or in a security's or government's credit rating may affect a security's value. A change in 
the credit rating of a municipal bond insurer that insures securities in the Fund&#x2019;s portfolio may 
affect the value of the securities it insures, the Fund&#x2019;s share price and Fund performance. The 
Fund might also be adversely impacted by the inability of an insurer to meet its insurance obligations.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_Liquidity2_S000006933Summary1Member"
      id="ixv-2136">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The trading market for a particular security or type of security or other investments in which the Fund 
invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the 
Fund&#x2019;s ability to sell such securities or other investments when necessary to meet the Fund&#x2019;s 
liquidity needs, which may arise or increase in response to a specific economic event or because the 
investment manager wishes to purchase particular investments or believes that a higher level of liquidity 
would be advantageous. Reduced liquidity will also generally lower the value of such securities or other 
investments. Market prices for such securities or other investments may be relatively volatile.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_TaxLegislativeandPoliticalChanges2_S000006933Summary1Member"
      id="ixv-2140">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax 
Legislative and Political Changes:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The municipal securities market could be significantly affected 
by adverse political and legislative changes or litigation at the federal or state level. The value of 
municipal bonds is closely tied to the benefits of tax-exempt income to investors. Significant revisions 
of federal income tax laws or regulations revising income tax rates or the tax-exempt character of municipal 
bonds, or even proposed changes and deliberations on this topic by the federal government, could cause 
municipal bond prices to fall. For example, lower federal income tax rates would reduce certain relative 
advantages of owning municipal bonds, and lower state income tax rates could have similar effects. In 
addition, the application of corporate minimum tax rates to financial statement income may have the effect 
of reducing demand for municipal bonds among corporate investors, which may in turn impact municipal 
bond prices.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_Tax-ExemptSecurities2_S000006933Summary1Member"
      id="ixv-2144">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax-Exempt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Failure of a municipal security issuer 
to comply with applicable tax requirements may make income paid thereon taxable, resulting in a decline 
in the security&#x2019;s value. In addition, there could be changes in applicable tax laws or tax treatments 
that reduce or eliminate the current federal income tax &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;exemption 
on municipal securities or otherwise adversely affect the current federal or state tax status of municipal 
securities.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_Market2_S000006933Summary1Member"
      id="ixv-2168">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Market:  &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The market values of securities or other 
investments owned by the Fund will go up or down, sometimes rapidly or unpredictably. The market value 
of a security or other investment may be reduced by market activity or other results of supply and demand 
unrelated to the issuer. This is a basic risk associated with all investments. When there are more sellers 
than buyers, prices tend to fall. Likewise, when there are more buyers than sellers, prices tend to rise. 
In addition, the value of the Fund&#x2019;s investments may go up or down due to general market or other 
conditions that are not specifically related to a particular issuer, such as: real or perceived adverse 
economic changes, including widespread liquidity issues and defaults in one or more industries; changes 
in interest, inflation or exchange rates; unexpected natural and man-made world events, such as diseases 
or disasters; financial, political or social disruptions, including terrorism and war; and U.S. trade 
disputes or other disputes with specific countries that could result in additional tariffs, trade barriers 
and/or investment restrictions in certain securities in those countries. Any of these conditions can 
adversely affect the economic prospects of many companies, sectors, nations, regions and the market in 
general, in ways that cannot necessarily be foreseen.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Ongoing or threatened armed conflicts throughout 
the world have caused and could continue to cause significant market disruptions and volatility. The 
hostilities and sanctions resulting from those hostilities could have a significant impact on certain 
investments of the Fund as well as the Fund&#x2019;s performance and liquidity.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_States2_S000006933Summary1Member"
      id="ixv-2173">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;States:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund&#x2019;s portfolio is generally widely diversified among issuers of municipal securities. However, 
to the extent that the Fund has exposure from time to time to the municipal securities of a particular 
state, events in that state may affect the Fund&#x2019;s investments and performance. These events may 
include economic or political policy changes, tax base erosion, unfunded pension and healthcare liabilities, 
constitutional limits on tax increases, budget deficits and other financial difficulties, and changes 
in the credit ratings assigned to municipal issuers of the state. The same is true of events in U.S. 
territories, to the extent that the Fund has exposure to any particular territory at any given time.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_Focus2_S000006933Summary1Member"
      id="ixv-2177">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Focus:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund may invest more than 25% of its assets in municipal securities that finance similar types of 
projects, such as utilities, hospitals, higher education and transportation. A change that affects one 
project, such as proposed legislation on the financing of the project, a shortage of the materials needed 
for the project, or a declining need for the project, would likely affect all similar projects, thereby 
increasing market risk.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_Income2_S000006933Summary1Member"
      id="ixv-2199">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Income:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund's distributions to shareholders may decline when prevailing interest rates fall, when the Fund 
experiences defaults on debt securities it holds or when the Fund realizes a loss upon the sale of a 
debt security. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_Prepayment2_S000006933Summary1Member"
      id="ixv-2203">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Prepayment:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Prepayment risk occurs when a debt security 
can be repaid in whole or in part prior to the security's maturity and the Fund must reinvest the proceeds 
it receives, during periods of declining interest rates, in securities that pay a lower rate of interest. 
Also, if a security has been purchased at a premium, the value of the premium would be lost in the event 
of prepayment. Prepayments generally increase when interest rates fall.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_Inflation2_S000006933Summary1Member"
      id="ixv-2207">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Inflation:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt; 
 &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The 
market price of debt securities generally falls as inflation increases because the purchasing power of 
the future income and repaid principal is expected to be worth less when received by the Fund. Debt securities 
that pay a fixed rather than variable interest rate are especially vulnerable to inflation risk because 
variable-rate debt securities may be able to participate, over the long term, in rising interest rates 
which have historically corresponded with long-term inflationary trends.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_BondInsurers2_S000006933Summary1Member"
      id="ixv-2212">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Bond Insurers:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Market conditions or changes to ratings criteria could adversely impact the ratings of municipal bond 
insurance companies. Downgrades and withdrawal of ratings from municipal bond insurers have substantially 
limited the availability of insurance sought by municipal bond issuers thereby reducing the supply of 
insured municipal securities.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because of the consolidation among municipal bond insurers 
the Fund is subject to additional risks including the risk that credit risk may be concentrated among 
fewer insurers and the risk that events involving one or more municipal bond insurers could have a significant 
adverse effect on the value of the securities insured by an insurer and on the municipal markets as a 
whole.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_UnratedDebtSecurities2_S000006933Summary1Member"
      id="ixv-2217">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Unrated 
Debt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Certain unrated debt securities determined by the investment manager to be of 
comparable credit quality to rated securities which the Fund may purchase may pay a higher interest rate 
than such rated debt securities and be subject to a greater risk of illiquidity or price changes. Less 
public information and independent credit analysis are typically available about unrated securities or 
issuers, and therefore they may be subject to greater risk of default.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_Management2_S000006933Summary1Member"
      id="ixv-2221">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Management:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund is subject to management risk because it is an actively managed investment portfolio. The Fund's 
investment manager applies investment techniques and risk analyses in making investment decisions for 
the Fund, but there can be no guarantee that these decisions will produce the desired results.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_Cybersecurity2_S000006933Summary1Member"
      id="ixv-2225">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Cybersecurity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain 
access to Fund assets, Fund or customer data (including private shareholder information), or proprietary 
information, cause the &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Fund, 
the investment manager, and/or their service providers (including, but not limited to, Fund accountants, 
custodians, sub-custodians, transfer agents and financial intermediaries) to suffer data breaches, data 
corruption or loss of operational functionality or prevent Fund investors from purchasing, redeeming 
or exchanging shares or receiving distributions. The investment manager has limited ability to prevent 
or mitigate cybersecurity incidents affecting third party service providers, and such third party service 
providers may have limited indemnification obligations to the Fund or the investment manager. Cybersecurity 
incidents may result in financial losses to the Fund and its shareholders, and substantial costs may 
be incurred in an effort to prevent or mitigate future cybersecurity incidents. Issuers of securities 
in which the Fund invests are also subject to cybersecurity risks, and the value of these securities 
could decline if the issuers experience cybersecurity incidents.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because technology is frequently changing, 
new ways to carry out cyber attacks are always developing. Therefore, there is a chance that some risks 
have not been identified or prepared for, or that an attack may not be detected, which puts limitations 
on the Fund's ability to plan for or respond to a cyber attack. Like other funds and business enterprises, 
the Fund, the investment manager, and their service providers are subject to the risk of cyber incidents 
occurring from time to time.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-110227">Performance</oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-2251">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The following bar chart and table provide 
some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund's performance 
from year to year for Class A shares. The table shows how the Fund's average annual returns for 1 year, 
5 years, 10 years or since inception, as applicable, compared with those of a broad measure of market 
performance and an additional index with characteristics relevant to the Fund. The Fund's past performance 
(before and after taxes) is not necessarily an indication of how the Fund will perform in the future. 
You can obtain updated performance information at www.franklintempleton.com or by calling (800) DIAL 
BEN/342-5236.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Sales 
charges are not reflected in the bar chart, and if those charges were included, returns would be less 
than those shown.&lt;/p&gt;</oef:PerformanceNarrativeTextBlock>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-110228">The Fund's past performance 
(before and after taxes) is not necessarily an indication of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-110229">franklintempleton.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-110230">Sales 
charges are not reflected in the bar chart, and if those charges were included, returns would be less 
than those shown.</oef:BarChartDoesNotReflectSalesLoads>
    <oef:BarChartHeading
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-110231">Class A Annual Total Returns</oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-2275">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:17.33%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:68%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.67%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Best Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2023, Q4&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;3.47%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Worst Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2022, Q1&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;-3.13%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="2" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:100%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; font-size:1pt;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was 0.25%.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</oef:BarChartClosingTextBlock>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      id="ixv-110232">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      id="ixv-110233">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110234"
      unitRef="pure">0.0347</oef:BarChartHighestQuarterlyReturn>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      id="ixv-110235">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      id="ixv-110236">2022-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110237"
      unitRef="pure">-0.0313</oef:BarChartLowestQuarterlyReturn>
    <oef:YearToDateReturnLabel
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      id="ixv-110238">As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was 0.25%.</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturnDate
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      id="ixv-110239">2026-03-31</oef:BarChartYearToDateReturnDate>
    <oef:BarChartYearToDateReturn
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110240"
      unitRef="pure">0.0025</oef:BarChartYearToDateReturn>
    <oef:PerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-110241">Average Annual Total Returns (figures 
reflect sales charges) For periods ended December 31, 2025</oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      id="ixv-110242">Return before taxes</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110243"
      unitRef="pure">0.0168</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110244"
      unitRef="pure">0.0094</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110245"
      unitRef="pure">0.0126</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205911Member_S000006933Member_S000006933Summary1Member"
      id="ixv-110246">Return after taxes on 
distributions</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110247"
      unitRef="pure">0.0168</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110248"
      unitRef="pure">0.0090</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110249"
      unitRef="pure">0.0124</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205911Member_S000006933Member_S000006933Summary1Member"
      id="ixv-110250">Return after taxes on distributions and sale of Fund shares</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110251"
      unitRef="pure">0.0208</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110252"
      unitRef="pure">0.0111</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110253"
      unitRef="pure">0.0128</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018804Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110254"
      unitRef="pure">0.0174</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018804Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110255"
      unitRef="pure">0.0104</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018804Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110256"
      unitRef="pure">0.0134</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000194373Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110257"
      unitRef="pure">0.0431</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000194373Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110258"
      unitRef="pure">0.0169</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20170801_20251231_C000194373Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="_321_"
      unitRef="pure">0.0193</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000096868Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110260"
      unitRef="pure">0.0427</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000096868Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110261"
      unitRef="pure">0.0168</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000096868Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110262"
      unitRef="pure">0.0172</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalBondIndex33_S000006933Member_S000006933Summary1Member"
      id="ixv-110263">Bloomberg Municipal Bond 
Index </oef:AverageAnnualReturnLabel>
    <oef:IndexNoDeductionForFeesExpensesTaxes
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-110264">(index reflects no deduction for fees, expenses or taxes)</oef:IndexNoDeductionForFeesExpensesTaxes>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalBondIndex33_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110265"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalBondIndex33_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110266"
      unitRef="pure">0.0080</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalBondIndex33_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110267"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalShort1-5YearsIndex34_S000006933Member_S000006933Summary1Member"
      id="ixv-110268">Bloomberg Municipal Short 
1-5 Years Index </oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalShort1-5YearsIndex34_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110269"
      unitRef="pure">0.0411</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalShort1-5YearsIndex34_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110270"
      unitRef="pure">0.0136</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalShort1-5YearsIndex34_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-110271"
      unitRef="pure">0.0167</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110272">Franklin 
High Yield Tax-Free Income Fund</oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110273">Investment Goal</oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-2656">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;To provide investors with 
a high current yield exempt from federal income taxes. Its secondary goal is capital appreciation to 
the extent possible and consistent with the Fund's principal investment goal.&lt;/p&gt;</oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110274">Fees and 
Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-2659">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;These tables describe the fees and expenses that you may pay if you buy, hold 
and sell shares of the Fund. &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;You may pay other fees (including on Class R6 and Advisor Class 
shares), such as brokerage commissions and other fees to financial intermediaries, which are not reflected 
in the tables and examples below.&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor. 
More information about these and other discounts is available from your financial professional and under 
&#x201c;Your Account&#x201d; on page 94 in the Fund&#x2019;s Prospectus and under &#x201c;Buying and Selling 
Shares&#x201d; on page 53 of the Fund&#x2019;s Statement of Additional Information. In addition, more information 
about sales charge discounts and waivers for purchases of shares through specific financial intermediaries 
is set forth in Appendix A &#x2013; &#x201c;Intermediary Sales Charge Discounts and Waivers&#x201d; to the 
Fund&#x2019;s prospectus.&lt;/span&gt;&lt;/p&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110275">You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor.</oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110276"
      unitRef="usd">100000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110277">Shareholder Fees</oef:ShareholderFeesCaption>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110278"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018758Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110279"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018760Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110280"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194355Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110281"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018757Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110282"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="_348_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018758Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="_349_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018760Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110285"
      unitRef="pure">0.0100</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194355Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110286"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018757Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110287"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:OperatingExpensesCaption
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110288">Annual 
Fund Operating Expenses (expenses that you pay each year as a percentage of the value 
of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110289"
      unitRef="pure">0.0045</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018758Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110290"
      unitRef="pure">0.0045</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018760Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110291"
      unitRef="pure">0.0045</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000194355Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110292"
      unitRef="pure">0.0045</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018757Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110293"
      unitRef="pure">0.0045</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110294"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018758Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110295"
      unitRef="pure">0.0010</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018760Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110296"
      unitRef="pure">0.0065</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000194355Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110297"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018757Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110298"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110299"
      unitRef="pure">0.0011</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018758Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110300"
      unitRef="pure">0.0011</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018760Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110301"
      unitRef="pure">0.0010</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194355Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110302"
      unitRef="pure">0.0006</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018757Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110303"
      unitRef="pure">0.0011</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110304"
      unitRef="pure">0.0081</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018758Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110305"
      unitRef="pure">0.0066</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018760Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110306"
      unitRef="pure">0.0120</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194355Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110307"
      unitRef="pure">0.0051</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018757Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110308"
      unitRef="pure">0.0056</oef:ExpensesOverAssets>
    <oef:ExpenseExampleHeading
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110309">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-2935">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;This 
Example is intended to help you compare the cost of investing in the Fund with the cost of investing 
in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated 
and then redeem all of your shares at the end of the period. The Example also assumes that your investment 
has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual 
costs may be higher or lower, based on these assumptions your costs would be:&lt;/p&gt;</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110310"
      unitRef="usd">455</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110311"
      unitRef="usd">624</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110312"
      unitRef="usd">808</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110313"
      unitRef="usd">1340</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018758Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110314"
      unitRef="usd">440</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018758Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110315"
      unitRef="usd">579</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018758Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110316"
      unitRef="usd">730</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018758Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110317"
      unitRef="usd">1167</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018760Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110318"
      unitRef="usd">222</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018760Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110319"
      unitRef="usd">381</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018760Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110320"
      unitRef="usd">660</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018760Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110321"
      unitRef="usd">1346</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000194355Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110322"
      unitRef="usd">52</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000194355Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110323"
      unitRef="usd">163</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000194355Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110324"
      unitRef="usd">284</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000194355Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110325"
      unitRef="usd">639</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018757Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110326"
      unitRef="usd">57</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018757Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110327"
      unitRef="usd">179</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018757Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110328"
      unitRef="usd">312</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018757Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110329"
      unitRef="usd">701</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionByYearCaption
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110330">If you do not sell your shares:</oef:ExpenseExampleNoRedemptionByYearCaption>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Context_20260228_20260228_C000018760Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110331"
      unitRef="usd">122</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Context_20260228_20260228_C000018760Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110332"
      unitRef="usd">381</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Context_20260228_20260228_C000018760Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110333"
      unitRef="usd">660</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Context_20260228_20260228_C000018760Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110334"
      unitRef="usd">1346</oef:ExpenseExampleNoRedemptionYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110335">Portfolio 
Turnover</oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-3121">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities 
(or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs 
and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are 
not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During 
the most recent fiscal year, the Fund's portfolio turnover rate was 12.16% of the average value of its 
portfolio.&lt;/p&gt;</oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110336"
      unitRef="pure">0.1216</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110337">Principal Investment Strategies</oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-3124">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Under normal market conditions, 
the Fund invests at least 80% of its net assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the Fund tries to invest all of 
its assets in tax-free securities, it is possible that up to 20% of the Fund's net assets may be in securities 
that pay interest that &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;may 
be subject to the federal alternative minimum tax and in securities that pay interest subject to other 
federal or state income taxes.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund may invest in municipal securities rated in any rating category (or unrated 
or short-term rated securities of comparable credit quality), including defaulted securities.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund does not necessarily 
focus its investments in a particular state or territory, and will not invest more than 25% of its total 
assets in municipal securities of any one state or territory. The Fund may invest up to 35% of its total 
assets in municipal securities issued by U.S. territories.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the investment manager will search 
for investments across a large number of municipal securities that finance different types of projects, 
from time to time, based on economic conditions, the Fund may have significant positions in municipal 
securities that finance similar types of projects.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The investment manager selects securities that it believes 
will provide the best balance between risk and return within the Fund&#x2019;s range of allowable investments 
and typically invests with a long-term time horizon. This means it generally holds securities in the 
Fund&#x2019;s portfolio for income purposes, although the investment manager may sell a security at any 
time if it believes it could help the Fund meet its goal. With a focus on income, individual securities 
are considered for purchase or sale based on various factors and considerations, including credit profile, 
risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading 
and tax loss harvesting opportunities.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;When selecting securities for the Fund&#x2019;s portfolio, 
the investment manager may consider existing market conditions, the availability of lower-rated securities, 
and whether the difference in yields between higher and lower-rated securities justifies the higher risk 
of lower-rated securities. &lt;/p&gt;</oef:StrategyNarrativeTextBlock>
    <oef:StrategyPortfolioConcentration
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-3125">Under normal market conditions, 
the Fund invests at least 80% of its net assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. </oef:StrategyPortfolioConcentration>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110338">Under normal market conditions, 
the Fund invests at least 80% of its net assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax</fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110339">Under normal market conditions, 
the Fund invests at least 80% of its net assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax</fnd:NmRule35d1TermDfnSmryTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_PrincipalRisks2_S000006913Summary1Member"
      id="ixv-3153">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:13.0pt; font-family:Arial; text-align:left; color:#004C97; font-weight:normal; text-decoration:none;"&gt;Principal Risks&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;You could lose money by investing in the 
Fund. Mutual fund shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, 
and are not insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other 
agency of the U.S. government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_RiskLoseMoneyMember_S000006913Summary1Member"
      id="ixv-110340">You could lose money by investing in the 
Fund.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_RiskNotInsuredMember_S000006913Summary1Member"
      id="ixv-110341">Mutual fund shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, 
and are not insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other 
agency of the U.S. government.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_InterestRate2_S000006913Summary1Member"
      id="ixv-3156">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Interest Rate:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  When interest rates rise, debt security 
prices generally fall. The opposite is also generally true: debt security prices rise when interest rates 
fall. Interest rate changes are influenced by a number of factors, including government policy, monetary 
policy, inflation expectations, perceptions of risk, and supply of and demand for bonds. In general, 
securities with longer maturities or durations are more sensitive to interest rate changes. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_Credit2_S000006913Summary1Member"
      id="ixv-3178">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Credit:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 An issuer of debt securities may fail to make interest payments or repay principal when due, in whole 
or in part. Changes in an issuer's financial strength or in a security's or government's credit rating 
may affect a security's value. A change in the credit rating of a municipal bond insurer that insures 
securities in the Fund&#x2019;s portfolio may affect the value of the securities it insures, the Fund&#x2019;s 
share price and Fund performance. The Fund might also be adversely impacted by the inability of an insurer 
to meet its insurance obligations.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_Liquidity2_S000006913Summary1Member"
      id="ixv-3182">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The trading market 
for a particular security or type of security or other investments in which the Fund invests may become 
less liquid or even illiquid. Reduced liquidity will have an adverse impact on the Fund&#x2019;s ability 
to sell such securities or other investments when necessary to meet the Fund&#x2019;s liquidity needs, 
which may arise or increase in response to a specific economic event or because the investment manager 
wishes to purchase particular investments or believes that a higher level of liquidity would be advantageous. 
Reduced liquidity will also generally lower the value of such securities or other investments. Market 
prices for such securities or other investments may be relatively volatile.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_TaxLegislativeandPoliticalChanges2_S000006913Summary1Member"
      id="ixv-3186">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax Legislative 
and Political Changes:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The municipal securities market could be significantly affected by adverse political 
and legislative changes or litigation at the federal or state level. The value of municipal bonds is 
closely tied to the benefits of tax-exempt income to investors. Significant revisions of federal income 
tax laws or regulations revising income tax rates or the tax-exempt character of municipal bonds, or 
even proposed changes and deliberations on this topic by the federal government, could cause municipal 
bond prices to fall. For example, lower federal income tax rates would reduce certain relative advantages 
of owning municipal bonds, and lower state income tax rates could have similar effects. In addition, 
the application of corporate minimum tax rates to financial statement income may have the effect of reducing 
demand for municipal bonds among corporate investors, which may in turn impact municipal bond prices.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_Tax-ExemptSecurities2_S000006913Summary1Member"
      id="ixv-3190">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax-Exempt 
Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Failure of a municipal security issuer to comply with applicable tax requirements 
may make income paid thereon taxable, resulting in a decline in the security&#x2019;s value. In addition, 
there could be changes in applicable tax laws or tax treatments that reduce or eliminate the current 
federal income tax exemption on municipal securities or otherwise adversely affect the current federal 
or state tax status of municipal securities.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_Market2_S000006913Summary1Member"
      id="ixv-3194">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Market:  &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The market values of 
securities or other investments owned by the Fund will go up or down, sometimes rapidly or unpredictably. 
The market value of a security or other investment may be reduced by market activity or other results 
of supply and demand unrelated to the issuer. This is a basic risk associated with all investments. When 
there are more sellers than buyers, prices tend to fall. Likewise, when there are more buyers than sellers, 
prices tend to rise. In addition, the value of the Fund&#x2019;s investments may go up or down due to 
general market or other &lt;/span&gt;&lt;/p&gt;

</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_conditionsthatarenotspecificallyrelatedtoaparticularissuersuchas2_S000006913Summary1Member"
      id="ixv-3217">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;conditions 
that are not specifically related to a particular issuer, such as: real or perceived adverse economic 
changes, including widespread liquidity issues and defaults in one or more industries; changes in interest, 
inflation or exchange rates; unexpected natural and man-made world events, such as diseases or disasters; 
financial, political or social disruptions, including terrorism and war; and U.S. trade disputes or other 
disputes with specific countries that could result in additional tariffs, trade barriers and/or investment 
restrictions in certain securities in those countries. Any of these conditions can adversely affect the 
economic prospects of many companies, sectors, nations, regions and the market in general, in ways that 
cannot necessarily be foreseen.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Ongoing or threatened armed conflicts throughout the world have caused and could 
continue to cause significant market disruptions and volatility. The hostilities and sanctions resulting 
from those hostilities could have a significant impact on certain investments of the Fund as well as 
the Fund&#x2019;s performance and liquidity.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_High-YieldDebtInstruments2_S000006913Summary1Member"
      id="ixv-3220">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;High-Yield Debt Instruments:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Issuers of lower-rated or &#x201c;high-yield&#x201d; debt instruments (also known as &#x201c;junk bonds&#x201d;) 
are not as strong financially as those issuing higher credit quality debt instruments. High-yield debt 
instruments are generally considered predominantly speculative by the applicable rating agencies as their 
issuers are more likely to encounter financial difficulties because they may be more highly leveraged, 
or because of other considerations. In addition, high yield debt instruments generally are more vulnerable 
to changes in the relevant economy, such as a recession or a sustained period of rising interest rates, 
that could affect their ability to make interest and principal payments when due. The prices of high-yield 
debt instruments generally fluctuate more than those of higher credit quality. High-yield debt instruments 
are generally more illiquid (harder to sell) and harder to value. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_States2_S000006913Summary1Member"
      id="ixv-3224">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;States:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund&#x2019;s portfolio is generally widely diversified among issuers of municipal securities. However, 
to the extent that the Fund has exposure from time to time to the municipal securities of a particular 
state, events in that state may affect the Fund&#x2019;s investments and performance. These events may 
include economic or political policy changes, tax base erosion, unfunded pension and healthcare liabilities, 
constitutional limits on tax increases, budget deficits and other financial difficulties, and changes 
in the credit ratings assigned to municipal issuers of the state. The same is true of events in U.S. 
territories, to the extent that the Fund has exposure to any particular territory at any given time.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_Focus2_S000006913Summary1Member"
      id="ixv-3228">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Focus:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund may invest more than 25% of its assets in municipal securities that finance similar types of 
projects, such as utilities, hospitals, higher education and transportation. A change that affects one 
project, such as proposed legislation on the financing of the project, a shortage of the materials needed 
for the project, or a declining need for the project, would likely affect all similar projects, thereby 
increasing market risk.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_Income2_S000006913Summary1Member"
      id="ixv-3250">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Income:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund's distributions to shareholders may decline when prevailing interest rates fall, when the Fund 
experiences defaults on debt securities it holds or when the Fund realizes a loss upon the sale of a 
debt security. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_Prepayment2_S000006913Summary1Member"
      id="ixv-3254">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Prepayment:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Prepayment risk occurs when a debt security 
can be repaid in whole or in part prior to the security's maturity and the Fund must reinvest the proceeds 
it receives, during periods of declining interest rates, in securities that pay a lower rate of interest. 
Also, if a security has been purchased at a premium, the value of the premium would be lost in the event 
of prepayment. Prepayments generally increase when interest rates fall.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_Inflation2_S000006913Summary1Member"
      id="ixv-3258">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Inflation:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt; 
 &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The 
market price of debt securities generally falls as inflation increases because the purchasing power of 
the future income and repaid principal is expected to be worth less when received by the Fund. Debt securities 
that pay a fixed rather than variable interest rate are especially vulnerable to inflation risk because 
variable-rate debt securities may be able to participate, over the long term, in rising interest rates 
which have historically corresponded with long-term inflationary trends.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_BondInsurers2_S000006913Summary1Member"
      id="ixv-3263">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Bond Insurers:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Market conditions or changes to ratings criteria could adversely impact the ratings of municipal bond 
insurance companies. Downgrades and withdrawal of ratings from municipal bond insurers have substantially 
limited the availability of insurance sought by municipal bond issuers thereby reducing the supply of 
insured municipal securities.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because of the consolidation among municipal bond insurers 
the Fund is subject to additional risks including the risk that credit risk may be concentrated among 
fewer insurers and the risk that events involving one or more municipal bond insurers could have a significant 
adverse effect on the value of the securities insured by an insurer and on the municipal markets as a 
whole.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_UnratedDebtSecurities2_S000006913Summary1Member"
      id="ixv-3268">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Unrated 
Debt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Certain unrated debt securities determined by the investment manager to be of 
comparable credit quality to rated securities which the Fund may purchase may pay a higher interest rate 
than such rated debt securities and be subject to a greater risk of illiquidity or price changes. Less 
public information and independent credit analysis are typically available about unrated securities or 
issuers, and therefore they may be subject to greater risk of default.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_Management2_S000006913Summary1Member"
      id="ixv-3272">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Management:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund is subject to management risk because it is an actively managed investment portfolio. The Fund's 
investment manager applies investment techniques and risk analyses in making investment decisions for 
the Fund, but there can be no guarantee that these decisions will produce the desired results.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_Cybersecurity2_S000006913Summary1Member"
      id="ixv-3276">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Cybersecurity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain 
access to Fund assets, Fund or customer data (including private shareholder information), or proprietary 
information, cause the &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Fund, 
the investment manager, and/or their service providers (including, but not limited to, Fund accountants, 
custodians, sub-custodians, transfer agents and financial intermediaries) to suffer data breaches, data 
corruption or loss of operational functionality or prevent Fund investors from purchasing, redeeming 
or exchanging shares or receiving distributions. The investment manager has limited ability to prevent 
or mitigate cybersecurity incidents affecting third party service providers, and such third party service 
providers may have limited indemnification obligations to the Fund or the investment manager. Cybersecurity 
incidents may result in financial losses to the Fund and its shareholders, and substantial costs may 
be incurred in an effort to prevent or mitigate future cybersecurity incidents. Issuers of securities 
in which the Fund invests are also subject to cybersecurity risks, and the value of these securities 
could decline if the issuers experience cybersecurity incidents.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because technology is frequently changing, 
new ways to carry out cyber attacks are always developing. Therefore, there is a chance that some risks 
have not been identified or prepared for, or that an attack may not be detected, which puts limitations 
on the Fund's ability to plan for or respond to a cyber attack. Like other funds and business enterprises, 
the Fund, the investment manager, and their service providers are subject to the risk of cyber incidents 
occurring from time to time.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110342">Performance</oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-3302">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The following bar chart and table provide 
some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund's performance 
from year to year for Class A shares. The table shows how the Fund's average annual returns for 1 year, 
5 years, 10 years or since inception, as applicable, compared with those of a broad measure of market 
performance. The Fund's past performance (before and after taxes) is not necessarily an indication of 
how the Fund will perform in the future. You can obtain updated performance information at www.franklintempleton.com 
or by calling (800) DIAL BEN/342-5236.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Sales charges are not reflected in the bar chart, and if those 
charges were included, returns would be less than those shown.&lt;/p&gt;</oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110343">The following bar chart and table provide 
some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund's performance 
from year to year for Class A shares. The table shows how the Fund's average annual returns for 1 year, 
5 years, 10 years or since inception, as applicable, compared with those of a broad measure of market 
performance.</oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110344">The Fund's past performance (before and after taxes) is not necessarily an indication of 
how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110345">franklintempleton.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:PerformanceAvailabilityPhone
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110346">(800) DIAL BEN/342-5236</oef:PerformanceAvailabilityPhone>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110347">Sales charges are not reflected in the bar chart, and if those 
charges were included, returns would be less than those shown.</oef:BarChartDoesNotReflectSalesLoads>
    <oef:BarChartHeading
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110348">Class A Annual Total Returns</oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-3326">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:17.33%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:68%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.67%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Best Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2023, Q4&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;7.94%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Worst Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2022, Q1&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;-7.22%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="2" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:100%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; font-size:1pt;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was 0.18%.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</oef:BarChartClosingTextBlock>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member"
      id="ixv-110349">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member"
      id="ixv-110350">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110351"
      unitRef="pure">0.0794</oef:BarChartHighestQuarterlyReturn>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member"
      id="ixv-110352">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member"
      id="ixv-110353">2022-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110354"
      unitRef="pure">-0.0722</oef:BarChartLowestQuarterlyReturn>
    <oef:YearToDateReturnLabel
      contextRef="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member"
      id="ixv-110355">As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was 0.18%.</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturnDate
      contextRef="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member"
      id="ixv-110356">2026-03-31</oef:BarChartYearToDateReturnDate>
    <oef:BarChartYearToDateReturn
      contextRef="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110357"
      unitRef="pure">0.0018</oef:BarChartYearToDateReturn>
    <oef:PerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110358">Average Annual Total Returns (figures 
reflect sales charges) For periods ended December 31, 2025</oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_C000199703Member_S000006913Member_S000006913Summary1Member"
      id="ixv-110359">Return before taxes</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110360"
      unitRef="pure">0.0006</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110361"
      unitRef="pure">0.0034</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110362"
      unitRef="pure">0.0214</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000199703Member_S000006913Member_S000006913Summary1Member"
      id="ixv-110363">Return after taxes on 
distributions</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110364"
      unitRef="pure">-0.0003</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110365"
      unitRef="pure">0.0027</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110366"
      unitRef="pure">0.0211</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000199703Member_S000006913Member_S000006913Summary1Member"
      id="ixv-110367">Return after taxes on distributions and sale of Fund shares</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110368"
      unitRef="pure">0.0174</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110369"
      unitRef="pure">0.0110</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110370"
      unitRef="pure">0.0253</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018758Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110371"
      unitRef="pure">0.0019</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018758Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110372"
      unitRef="pure">0.0047</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018758Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110373"
      unitRef="pure">0.0224</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018760Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110374"
      unitRef="pure">0.0246</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018760Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110375"
      unitRef="pure">0.0060</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018760Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110376"
      unitRef="pure">0.0201</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000194355Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110377"
      unitRef="pure">0.0424</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000194355Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110378"
      unitRef="pure">0.0135</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20170801_20251231_C000194355Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="_483_"
      unitRef="pure">0.0272</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018757Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110380"
      unitRef="pure">0.0420</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018757Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110381"
      unitRef="pure">0.0133</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018757Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110382"
      unitRef="pure">0.0271</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalBondIndex35_S000006913Member_S000006913Summary1Member"
      id="ixv-110383">Bloomberg Municipal Bond Index </oef:AverageAnnualReturnLabel>
    <oef:IndexNoDeductionForFeesExpensesTaxes
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-110384">(index reflects no deduction 
for fees, expenses or taxes)</oef:IndexNoDeductionForFeesExpensesTaxes>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalBondIndex35_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110385"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalBondIndex35_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110386"
      unitRef="pure">0.0080</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalBondIndex35_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-110387"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110388">Franklin 
Massachusetts Tax-Free Income Fund</oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110389">Investment Goal</oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-3709">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;To provide investors with 
as high a level of income exempt from federal income taxes as is consistent with prudent investment management 
and the preservation of shareholders&#x2019; capital. The Fund also tries to provide a maximum level of 
income exempt from personal income taxes, if any, for resident shareholders of Massachusetts.&lt;/p&gt;</oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110390">Fees and 
Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-3712">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;These tables describe the fees and expenses that you may pay if you buy, hold 
and sell shares of the Fund. &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;You may pay other fees (including on Class R6 and Advisor Class 
shares), such as brokerage commissions and other fees to financial intermediaries, which are not reflected 
in the tables and examples below.&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor. 
More information about these and other discounts is available from your financial professional and under 
&#x201c;Your Account&#x201d; on page 94 in the Fund&#x2019;s Prospectus and under &#x201c;Buying and Selling 
Shares&#x201d; on page 53 of the Fund&#x2019;s Statement of Additional Information. In addition, more information 
about sales charge discounts and waivers for purchases of shares through specific financial intermediaries 
is set forth in Appendix A &#x2013; &#x201c;Intermediary Sales Charge Discounts and Waivers&#x201d; to the 
Fund&#x2019;s prospectus.&lt;/span&gt;&lt;/p&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110391">You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor.</oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110392"
      unitRef="usd">100000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110393">Shareholder Fees</oef:ShareholderFeesCaption>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110394"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018769Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110395"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018770Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110396"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194359Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110397"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000079636Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110398"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="_505_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018769Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="_506_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018770Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110401"
      unitRef="pure">0.0100</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194359Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110402"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000079636Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110403"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:OperatingExpensesCaption
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110404">Annual 
Fund Operating Expenses (expenses that you pay each year as a percentage of the value 
of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110405"
      unitRef="pure">0.0053</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018769Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110406"
      unitRef="pure">0.0053</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018770Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110407"
      unitRef="pure">0.0053</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000194359Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110408"
      unitRef="pure">0.0053</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000079636Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110409"
      unitRef="pure">0.0053</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110410"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018769Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110411"
      unitRef="pure">0.0010</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018770Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110412"
      unitRef="pure">0.0065</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000194359Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110413"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000079636Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110414"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110415"
      unitRef="pure">0.0016</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018769Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110416"
      unitRef="pure">0.0015</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018770Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110417"
      unitRef="pure">0.0014</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194359Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110418"
      unitRef="pure">0.0007</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079636Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110419"
      unitRef="pure">0.0016</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110420"
      unitRef="pure">0.0094</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018769Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110421"
      unitRef="pure">0.0078</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018770Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110422"
      unitRef="pure">0.0132</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194359Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110423"
      unitRef="pure">0.0060</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079636Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110424"
      unitRef="pure">0.0069</oef:ExpensesOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="_531_"
      unitRef="pure">-0.0004</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000018769Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="_532_"
      unitRef="pure">-0.0003</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000018770Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="_533_"
      unitRef="pure">-0.0002</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000194359Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="_534_"
      unitRef="pure">0</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000079636Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="_535_"
      unitRef="pure">-0.0004</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110430"
      unitRef="pure">0.0090</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018769Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110431"
      unitRef="pure">0.0075</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018770Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110432"
      unitRef="pure">0.0130</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194359Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110433"
      unitRef="pure">0.0060</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079636Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110434"
      unitRef="pure">0.0065</oef:NetExpensesOverAssets>
    <oef:ExpenseExampleHeading
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110435">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-4039">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;This 
Example is intended to help you compare the cost of investing in the Fund with the cost of investing 
in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated 
and then redeem all of your shares at the end of the period. The Example also assumes that your investment 
has a 5% return each year and that the Fund's operating expenses remain the same. The Example reflects 
adjustments made to the Fund's operating expenses due to the fee waivers and/or expense reimbursements 
by management for the 1 Year numbers only. Although your actual costs may be higher or lower, based on 
these assumptions your costs would be:&lt;/p&gt;</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110436"
      unitRef="usd">463</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110437"
      unitRef="usd">659</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110438"
      unitRef="usd">871</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110439"
      unitRef="usd">1482</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018769Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110440"
      unitRef="usd">449</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018769Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110441"
      unitRef="usd">612</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018769Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110442"
      unitRef="usd">789</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018769Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110443"
      unitRef="usd">1301</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018770Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110444"
      unitRef="usd">232</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018770Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110445"
      unitRef="usd">416</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018770Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110446"
      unitRef="usd">721</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018770Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110447"
      unitRef="usd">1483</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000194359Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110448"
      unitRef="usd">61</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000194359Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110449"
      unitRef="usd">192</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000194359Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110450"
      unitRef="usd">335</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000194359Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110451"
      unitRef="usd">750</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000079636Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110452"
      unitRef="usd">66</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000079636Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110453"
      unitRef="usd">217</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000079636Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110454"
      unitRef="usd">380</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000079636Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110455"
      unitRef="usd">855</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionByYearCaption
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110456">If you do not sell your shares:</oef:ExpenseExampleNoRedemptionByYearCaption>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Context_20260228_20260228_C000018770Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110457"
      unitRef="usd">132</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Context_20260228_20260228_C000018770Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110458"
      unitRef="usd">416</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Context_20260228_20260228_C000018770Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110459"
      unitRef="usd">721</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Context_20260228_20260228_C000018770Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110460"
      unitRef="usd">1483</oef:ExpenseExampleNoRedemptionYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110461">Portfolio 
Turnover</oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-4225">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities 
(or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs 
and may result in higher taxes when Fund shares are held &lt;/p&gt;

&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;in 
a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, 
affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate 
was 21.12% of the average value of its portfolio.&lt;/p&gt;</oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110462"
      unitRef="pure">0.2112</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110463">Principal Investment Strategies</oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-4248">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Under 
normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax. In addition, under 
normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest 
free from the personal income taxes, if any, of Massachusetts. &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the Fund tries 
to invest all of its assets in tax-free securities, it is possible that up to 20% of the Fund's total 
assets may be in securities that pay interest that may be subject to the federal alternative minimum 
tax and in securities that pay interest subject to other federal or state income taxes.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund only buys municipal 
securities rated, at the time of purchase, in one of the top four ratings categories by one or more U.S. 
nationally recognized rating services (or unrated or short-term rated securities of comparable credit 
quality).&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
Fund also may invest up to 35% of its total assets in municipal securities issued by U.S. territories.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although 
the investment manager will search for investments across a large number of municipal securities that 
finance different types of projects, from time to time, based on economic conditions, the Fund may have 
significant positions in municipal securities that finance similar types of projects.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The investment manager 
selects securities that it believes will provide the best balance between risk and return within the 
Fund&#x2019;s range of allowable investments and typically invests with a long-term time horizon. This 
means it generally holds securities in the Fund&#x2019;s portfolio for income purposes, although the investment 
manager may sell a security at any time if it believes it could help the Fund meet its goal. With a focus 
on income, individual securities are considered for purchase or sale based on various factors and considerations, 
including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, 
opportunistic trading and tax loss harvesting opportunities. &lt;/p&gt;</oef:StrategyNarrativeTextBlock>
    <oef:StrategyPortfolioConcentration
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110464">Under 
normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax.</oef:StrategyPortfolioConcentration>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110465">Under 
normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax. In addition, under 
normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest 
free from the personal income taxes, if any, of Massachusetts</fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110466">Under 
normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax. In addition, under 
normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest 
free from the personal income taxes, if any, of Massachusetts</fnd:NmRule35d1TermDfnSmryTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_PrincipalRisks2_S000006918Summary1Member"
      id="ixv-4255">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:13.0pt; font-family:Arial; text-align:left; color:#004C97; font-weight:normal; text-decoration:none;"&gt;Principal Risks&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;You could lose money by 
investing in the Fund. Mutual fund shares are not deposits or obligations of, or guaranteed or endorsed 
by, any bank, and are not insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, 
or any other agency of the U.S. government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_RiskLoseMoneyMember_S000006918Summary1Member"
      id="ixv-110469">You could lose money by 
investing in the Fund.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_RiskNotInsuredMember_S000006918Summary1Member"
      id="ixv-110470">Mutual fund shares are not deposits or obligations of, or guaranteed or endorsed 
by, any bank, and are not insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, 
or any other agency of the U.S. government.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_InterestRate2_S000006918Summary1Member"
      id="ixv-4276">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Interest 
Rate:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 When interest rates rise, debt security prices generally fall. The opposite is also generally true: 
debt security prices rise when interest rates fall. Interest rate changes are influenced by a number 
of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, 
and supply of and demand for bonds. In general, securities with longer maturities or durations are more 
sensitive to interest rate changes. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_Credit2_S000006918Summary1Member"
      id="ixv-4280">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Credit:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  An issuer of debt securities may fail 
to make interest payments or repay principal when due, in whole or in part. Changes in an issuer's financial 
strength or in a security's or government's credit rating may affect a security's value. A change in 
the credit rating of a municipal bond insurer that insures securities in the Fund&#x2019;s portfolio may 
affect the value of the securities it insures, the Fund&#x2019;s share price and Fund performance. The 
Fund might also be adversely impacted by the inability of an insurer to meet its insurance obligations.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_Liquidity2_S000006918Summary1Member"
      id="ixv-4284">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The trading market for a particular security or type of security or other investments in which the Fund 
invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the 
Fund&#x2019;s ability to sell such securities or other investments when necessary to meet the Fund&#x2019;s 
liquidity needs, which may arise or increase in response to a specific economic event or because the 
investment manager wishes to purchase particular investments or believes that a higher level of liquidity 
would be advantageous. Reduced liquidity will also generally lower the value of such securities or other 
investments. Market prices for such securities or other investments may be relatively volatile.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_TaxLegislativeandPoliticalChanges2_S000006918Summary1Member"
      id="ixv-4288">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax 
Legislative and Political Changes:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The municipal securities market could be significantly affected 
by adverse political and legislative changes or litigation at the federal or state level. The value of 
municipal bonds is closely tied to the benefits of tax-exempt income to investors. Significant revisions 
of federal income tax laws or regulations revising income tax rates or the tax-exempt character of municipal 
bonds, or even proposed changes and deliberations on this topic by the federal government, could cause 
municipal bond prices to fall. For example, lower federal income tax rates would reduce certain relative 
advantages of owning municipal bonds, and lower state income tax rates could have similar effects. In 
addition, the application of corporate minimum tax rates to financial statement income may have the effect 
of reducing demand for municipal bonds among corporate investors, which may in turn impact municipal 
bond prices.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_Tax-ExemptSecurities2_S000006918Summary1Member"
      id="ixv-4292">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax-Exempt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Failure of a municipal security issuer 
to comply with applicable tax requirements may make income paid thereon taxable, resulting in a decline 
in the security&#x2019;s value. In addition, there could be changes in applicable tax laws or tax treatments 
that reduce or eliminate the current federal income tax exemption on municipal securities or otherwise 
adversely affect the current federal or state tax status of municipal securities.&lt;/span&gt;&lt;/p&gt;
</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_Market2_S000006918Summary1Member"
      id="ixv-4315">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Market: 
 &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The 
market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly 
or unpredictably. The market value of a security or other investment may be reduced by market activity 
or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all 
investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more 
buyers than sellers, prices tend to rise. In addition, the value of the Fund&#x2019;s investments may 
go up or down due to general market or other conditions that are not specifically related to a particular 
issuer, such as: real or perceived adverse economic changes, including widespread liquidity issues and 
defaults in one or more industries; changes in interest, inflation or exchange rates; unexpected natural 
and man-made world events, such as diseases or disasters; financial, political or social disruptions, 
including terrorism and war; and U.S. trade disputes or other disputes with specific countries that could 
result in additional tariffs, trade barriers and/or investment restrictions in certain securities in 
those countries. Any of these conditions can adversely affect the economic prospects of many companies, 
sectors, nations, regions and the market in general, in ways that cannot necessarily be foreseen.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Ongoing 
or threatened armed conflicts throughout the world have caused and could continue to cause significant 
market disruptions and volatility. The hostilities and sanctions resulting from those hostilities could 
have a significant impact on certain investments of the Fund as well as the Fund&#x2019;s performance 
and liquidity.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_Massachusetts2_S000006918Summary1Member"
      id="ixv-4320">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Massachusetts:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund invests predominantly in Massachusetts 
municipal securities. Therefore, events in Massachusetts are likely to affect the Fund&#x2019;s investments 
and its performance. These events may include economic or political policy changes, tax base erosion, 
unfunded pension and healthcare liabilities, state constitutional limits on tax increases, budget deficits 
and other financial difficulties, and changes in the credit ratings assigned to municipal issuers of 
Massachusetts. The same is true of events in other states or U.S. territories, to the extent that the 
Fund has exposure to any other state or territory at any given time.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_Focus2_S000006918Summary1Member"
      id="ixv-4324">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Focus:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund may invest more than 25% of its assets in municipal securities that finance similar types of 
projects, such as utilities, hospitals, higher education and transportation. A change that affects one 
project, such as proposed legislation on the financing of the project, a shortage of the materials needed 
for the project, or a declining need for the project, would likely affect all similar projects, thereby 
increasing market risk.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_Income2_S000006918Summary1Member"
      id="ixv-4328">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Income:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund's distributions to shareholders 
may decline when prevailing interest rates fall, when the Fund experiences defaults on debt securities 
it holds or when the Fund realizes a loss upon the sale of a debt security. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_Prepayment2_S000006918Summary1Member"
      id="ixv-4332">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Prepayment:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Prepayment risk occurs when a debt security can be repaid in whole or in part prior to the security's 
maturity and the Fund must reinvest the proceeds it &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;receives, 
during periods of declining interest rates, in securities that pay a lower rate of interest. Also, if 
a security has been purchased at a premium, the value of the premium would be lost in the event of prepayment. 
Prepayments generally increase when interest rates fall.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_Inflation2_S000006918Summary1Member"
      id="ixv-4356">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Inflation:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;  &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The market price of 
debt securities generally falls as inflation increases because the purchasing power of the future income 
and repaid principal is expected to be worth less when received by the Fund. Debt securities that pay 
a fixed rather than variable interest rate are especially vulnerable to inflation risk because variable-rate 
debt securities may be able to participate, over the long term, in rising interest rates which have historically 
corresponded with long-term inflationary trends.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_BondInsurers2_S000006918Summary1Member"
      id="ixv-4361">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Bond Insurers:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Market conditions or changes to ratings criteria could adversely impact the ratings of municipal bond 
insurance companies. Downgrades and withdrawal of ratings from municipal bond insurers have substantially 
limited the availability of insurance sought by municipal bond issuers thereby reducing the supply of 
insured municipal securities.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because of the consolidation among municipal bond insurers 
the Fund is subject to additional risks including the risk that credit risk may be concentrated among 
fewer insurers and the risk that events involving one or more municipal bond insurers could have a significant 
adverse effect on the value of the securities insured by an insurer and on the municipal markets as a 
whole.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_UnratedDebtSecurities2_S000006918Summary1Member"
      id="ixv-4366">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Unrated 
Debt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Certain unrated debt securities determined by the investment manager to be of 
comparable credit quality to rated securities which the Fund may purchase may pay a higher interest rate 
than such rated debt securities and be subject to a greater risk of illiquidity or price changes. Less 
public information and independent credit analysis are typically available about unrated securities or 
issuers, and therefore they may be subject to greater risk of default.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_Management2_S000006918Summary1Member"
      id="ixv-4370">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Management:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund is subject to management risk because it is an actively managed investment portfolio. The Fund's 
investment manager applies investment techniques and risk analyses in making investment decisions for 
the Fund, but there can be no guarantee that these decisions will produce the desired results.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_Cybersecurity2_S000006918Summary1Member"
      id="ixv-4374">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Cybersecurity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain 
access to Fund assets, Fund or customer data (including private shareholder information), or proprietary 
information, cause the Fund, the investment manager, and/or their service providers (including, but not 
limited to, Fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) 
to suffer data breaches, data corruption or loss of operational functionality or prevent Fund investors 
from purchasing redeeming or exchanging shares or receiving distributions. The investment manager has 
limited ability to prevent or mitigate cybersecurity incidents affecting third party service &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;providers, 
and such third party service providers may have limited indemnification obligations to the Fund or the 
investment manager. Cybersecurity incidents may result in financial losses to the Fund and its shareholders, 
and substantial costs may be incurred in an effort to prevent or mitigate future cybersecurity incidents. 
Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value 
of these securities could decline if the issuers experience cybersecurity incidents.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because technology is 
frequently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a 
chance that some risks have not been identified or prepared for, or that an attack may not be detected, 
which puts limitations on the Fund's ability to plan for or respond to a cyber attack. Like other funds 
and business enterprises, the Fund, the investment manager, and their service providers are subject to 
the risk of cyber incidents occurring from time to time.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110471">Performance</oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-4400">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future. You can obtain updated performance information 
at www.franklintempleton.com or by calling (800) DIAL BEN/342-5236.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.&lt;/p&gt;</oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110472">The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance.</oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110473">The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110474">franklintempleton.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:PerformanceAvailabilityPhone
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110475">(800) DIAL BEN/342-5236</oef:PerformanceAvailabilityPhone>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110476">Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.</oef:BarChartDoesNotReflectSalesLoads>
    <oef:BarChartHeading
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110477">Class A Annual Total Returns</oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-4424">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:17.33%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:68%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.67%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Best Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2023, Q4&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;7.41%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Worst Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2022, Q1&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;-6.54%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="2" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:100%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; font-size:1pt;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.20%.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</oef:BarChartClosingTextBlock>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      id="ixv-110478">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      id="ixv-110479">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110480"
      unitRef="pure">0.0741</oef:BarChartHighestQuarterlyReturn>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      id="ixv-110481">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      id="ixv-110482">2022-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110483"
      unitRef="pure">-0.0654</oef:BarChartLowestQuarterlyReturn>
    <oef:YearToDateReturnLabel
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      id="ixv-110484">As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.20%.</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturnDate
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      id="ixv-110485">2026-03-31</oef:BarChartYearToDateReturnDate>
    <oef:BarChartYearToDateReturn
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110486"
      unitRef="pure">-0.0020</oef:BarChartYearToDateReturn>
    <oef:PerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110487">Average Annual Total Returns (figures 
reflect sales charges) For periods ended December 31, 2025</oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      id="ixv-110488">Return before taxes</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110489"
      unitRef="pure">-0.0115</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110490"
      unitRef="pure">-0.0110</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110491"
      unitRef="pure">0.0107</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205897Member_S000006918Member_S000006918Summary1Member"
      id="ixv-110492">Return after taxes on 
distributions</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110493"
      unitRef="pure">-0.0116</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110494"
      unitRef="pure">-0.0111</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110495"
      unitRef="pure">0.0106</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205897Member_S000006918Member_S000006918Summary1Member"
      id="ixv-110496">Return after taxes on distributions and sale of Fund shares</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110497"
      unitRef="pure">0.0046</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110498"
      unitRef="pure">-0.0031</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110499"
      unitRef="pure">0.0142</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018769Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110500"
      unitRef="pure">-0.0091</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018769Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110501"
      unitRef="pure">-0.0093</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018769Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110502"
      unitRef="pure">0.0118</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018770Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110503"
      unitRef="pure">0.0135</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018770Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110504"
      unitRef="pure">-0.0076</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018770Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110505"
      unitRef="pure">0.0099</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000194359Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110506"
      unitRef="pure">0.0311</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000194359Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110507"
      unitRef="pure">-0.0003</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20170801_20251231_C000194359Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="_648_"
      unitRef="pure">0.0151</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000079636Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110509"
      unitRef="pure">0.0305</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000079636Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110510"
      unitRef="pure">-0.0008</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000079636Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110511"
      unitRef="pure">0.0167</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalBondIndex36_S000006918Member_S000006918Summary1Member"
      id="ixv-110512">Bloomberg Municipal Bond Index </oef:AverageAnnualReturnLabel>
    <oef:IndexNoDeductionForFeesExpensesTaxes
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-110513">(index reflects no deduction 
for fees, expenses or taxes)</oef:IndexNoDeductionForFeesExpensesTaxes>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalBondIndex36_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110514"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalBondIndex36_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110515"
      unitRef="pure">0.0080</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalBondIndex36_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-110516"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110517">Franklin 
New Jersey Tax-Free Income Fund</oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110518">Investment Goal</oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-4802">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;To provide investors 
with as high a level of income exempt from federal income taxes and from personal income taxes, if any, 
for resident shareholders of New Jersey as is consistent with prudent investment management and the preservation 
of shareholders&#x2019; capital.&lt;/span&gt;&lt;/p&gt;</oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110519">Fees and Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-4806">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;These 
tables describe the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. 
&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;You 
may pay other fees (including on Class R6 and Advisor Class shares), such as brokerage commissions and 
other fees to financial intermediaries, which are not reflected in the tables and examples below.&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest 
in the future, at least $100,000 in Franklin Templeton funds and certain other funds distributed through 
Franklin Distributors, LLC, the Fund&#x2019;s distributor. More information about these and other discounts 
is available from your financial professional and under &#x201c;Your Account&#x201d; on page 94 in the 
Fund&#x2019;s Prospectus and under &#x201c;Buying and Selling Shares&#x201d; on page 53 of the Fund&#x2019;s 
Statement of Additional Information. In addition, more information about sales charge discounts and waivers 
for purchases of shares through specific financial intermediaries is set forth in Appendix A &#x2013; 
&#x201c;Intermediary Sales Charge Discounts and Waivers&#x201d; to the Fund&#x2019;s prospectus.&lt;/span&gt;&lt;/p&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110520">You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest 
in the future, at least $100,000 in Franklin Templeton funds and certain other funds distributed through 
Franklin Distributors, LLC, the Fund&#x2019;s distributor.</oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110521"
      unitRef="usd">100000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110522">Shareholder 
Fees</oef:ShareholderFeesCaption>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110523"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018781Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110524"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018783Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110525"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194364Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110526"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000068551Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110527"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="_670_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018781Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="_671_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018783Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110530"
      unitRef="pure">0.0100</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194364Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110531"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000068551Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110532"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:OperatingExpensesCaption
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110533">Annual 
Fund Operating Expenses (expenses that you pay each year as a percentage of the value 
of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110534"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018781Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110535"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018783Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110536"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000194364Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110537"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000068551Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110538"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110539"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018781Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110540"
      unitRef="pure">0.0010</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018783Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110541"
      unitRef="pure">0.0065</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000194364Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110542"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000068551Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110543"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110544"
      unitRef="pure">0.0012</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018781Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110545"
      unitRef="pure">0.0012</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018783Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110546"
      unitRef="pure">0.0011</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194364Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110547"
      unitRef="pure">0.0005</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000068551Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110548"
      unitRef="pure">0.0012</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110549"
      unitRef="pure">0.0085</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018781Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110550"
      unitRef="pure">0.0070</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018783Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110551"
      unitRef="pure">0.0124</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194364Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110552"
      unitRef="pure">0.0053</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000068551Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110553"
      unitRef="pure">0.0060</oef:ExpensesOverAssets>
    <oef:ExpenseExampleHeading
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110554">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-5082">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;This 
Example is intended to help you compare the cost of investing in the Fund with the cost of investing 
in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated 
and then redeem all of your shares at the end of the period. The Example also assumes that your investment 
has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual 
costs may be higher or lower, based on these assumptions your costs would be:&lt;/p&gt;</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110555"
      unitRef="usd">459</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110556"
      unitRef="usd">637</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110557"
      unitRef="usd">829</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110558"
      unitRef="usd">1385</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018781Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110559"
      unitRef="usd">444</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018781Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110560"
      unitRef="usd">591</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018781Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110561"
      unitRef="usd">750</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018781Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110562"
      unitRef="usd">1213</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018783Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110563"
      unitRef="usd">226</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018783Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110564"
      unitRef="usd">393</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018783Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110565"
      unitRef="usd">680</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018783Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110566"
      unitRef="usd">1392</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000194364Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110567"
      unitRef="usd">54</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000194364Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110568"
      unitRef="usd">170</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000194364Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110569"
      unitRef="usd">297</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000194364Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110570"
      unitRef="usd">665</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000068551Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110571"
      unitRef="usd">61</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000068551Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110572"
      unitRef="usd">192</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000068551Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110573"
      unitRef="usd">335</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000068551Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110574"
      unitRef="usd">750</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionByYearCaption
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110575">If you do not sell your shares:</oef:ExpenseExampleNoRedemptionByYearCaption>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Context_20260228_20260228_C000018783Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110576"
      unitRef="usd">126</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Context_20260228_20260228_C000018783Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110577"
      unitRef="usd">393</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Context_20260228_20260228_C000018783Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110578"
      unitRef="usd">680</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Context_20260228_20260228_C000018783Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110579"
      unitRef="usd">1392</oef:ExpenseExampleNoRedemptionYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110580">Portfolio 
Turnover</oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-5268">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities 
(or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs 
and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are 
not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During 
the most recent fiscal year, the Fund's portfolio turnover rate was 18.26% of the average value of its 
portfolio.&lt;/p&gt;</oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110581"
      unitRef="pure">0.1826</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110582">Principal Investment Strategies</oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-5271">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Under normal market conditions, 
the Fund invests at least 80% of its net assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of New Jersey. &lt;/p&gt;
&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although 
the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the 
Fund's net assets may be in securities that pay interest that may be subject to the federal alternative 
minimum tax and in securities that pay interest subject to other federal or state income taxes.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories 
by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities 
of comparable credit quality).&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund also may invest up to 35% of its total assets in municipal securities 
issued by U.S. territories.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the investment manager will search for investments across a large number 
of municipal securities that finance different types of projects, from time to time, based on economic 
conditions, the Fund may have significant positions in municipal securities that finance similar types 
of projects.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
investment manager selects securities that it believes will provide the best balance between risk and 
return within the Fund&#x2019;s range of allowable investments and typically invests with a long-term 
time horizon. This means it generally holds securities in the Fund&#x2019;s portfolio for income purposes, 
although the investment manager may sell a security at any time if it believes it could help the Fund 
meet its goal. With a focus on income, individual securities are considered for purchase or sale based 
on various factors and considerations, including credit profile, risk, structure, pricing, portfolio 
impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities. 
&lt;/p&gt;</oef:StrategyNarrativeTextBlock>
    <oef:StrategyPortfolioConcentration
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110583">Under normal market conditions, 
the Fund invests at least 80% of its net assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax.</oef:StrategyPortfolioConcentration>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110584">Under normal market conditions, 
the Fund invests at least 80% of its net assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of New Jersey</fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110585">Under normal market conditions, 
the Fund invests at least 80% of its net assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of New Jersey</fnd:NmRule35d1TermDfnSmryTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_PrincipalRisks2_S000006923Summary1Member"
      id="ixv-5297">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:13.0pt; font-family:Arial; text-align:left; color:#004C97; font-weight:normal; text-decoration:none;"&gt;Principal Risks&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;You could lose money by investing in the Fund. Mutual fund 
shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_RiskLoseMoneyMember_S000006923Summary1Member"
      id="ixv-110588">You could lose money by investing in the Fund.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_RiskNotInsuredMember_S000006923Summary1Member"
      id="ixv-110589">Mutual fund 
shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_InterestRate2_S000006923Summary1Member"
      id="ixv-5300">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Interest 
Rate:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 When interest rates rise, debt security prices generally fall. The opposite is also generally true: 
debt security prices rise when interest rates fall. Interest rate changes are influenced by a number 
of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, 
and supply of and demand for bonds. In general, securities with longer maturities or durations are more 
sensitive to interest rate changes. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_Credit2_S000006923Summary1Member"
      id="ixv-5304">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Credit:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  An issuer of debt securities may fail 
to make interest payments or repay principal when due, in whole or in part. Changes in an issuer's financial 
strength or in a security's or government's credit rating may affect a security's value. A change in 
the credit rating of a municipal bond insurer that insures securities in the Fund&#x2019;s portfolio may 
affect the value of the securities it insures, the Fund&#x2019;s share price and &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Fund 
performance. The Fund might also be adversely impacted by the inability of an insurer to meet its insurance 
obligations.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_Liquidity2_S000006923Summary1Member"
      id="ixv-5328">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The trading market for a particular security or type of security or other investments in which the Fund 
invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the 
Fund&#x2019;s ability to sell such securities or other investments when necessary to meet the Fund&#x2019;s 
liquidity needs, which may arise or increase in response to a specific economic event or because the 
investment manager wishes to purchase particular investments or believes that a higher level of liquidity 
would be advantageous. Reduced liquidity will also generally lower the value of such securities or other 
investments. Market prices for such securities or other investments may be relatively volatile.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_TaxLegislativeandPoliticalChanges2_S000006923Summary1Member"
      id="ixv-5332">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax 
Legislative and Political Changes:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The municipal securities market could be significantly affected 
by adverse political and legislative changes or litigation at the federal or state level. The value of 
municipal bonds is closely tied to the benefits of tax-exempt income to investors. Significant revisions 
of federal income tax laws or regulations revising income tax rates or the tax-exempt character of municipal 
bonds, or even proposed changes and deliberations on this topic by the federal government, could cause 
municipal bond prices to fall. For example, lower federal income tax rates would reduce certain relative 
advantages of owning municipal bonds, and lower state income tax rates could have similar effects. In 
addition, the application of corporate minimum tax rates to financial statement income may have the effect 
of reducing demand for municipal bonds among corporate investors, which may in turn impact municipal 
bond prices.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_Tax-ExemptSecurities2_S000006923Summary1Member"
      id="ixv-5336">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax-Exempt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Failure of a municipal security issuer 
to comply with applicable tax requirements may make income paid thereon taxable, resulting in a decline 
in the security&#x2019;s value. In addition, there could be changes in applicable tax laws or tax treatments 
that reduce or eliminate the current federal income tax exemption on municipal securities or otherwise 
adversely affect the current federal or state tax status of municipal securities.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_Market2_S000006923Summary1Member"
      id="ixv-5340">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Market: 
 &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The 
market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly 
or unpredictably. The market value of a security or other investment may be reduced by market activity 
or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all 
investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more 
buyers than sellers, prices tend to rise. In addition, the value of the Fund&#x2019;s investments may 
go up or down due to general market or other conditions that are not specifically related to a particular 
issuer, such as: real or perceived adverse economic changes, including widespread liquidity issues and 
defaults in one or more industries; changes in interest, inflation or exchange rates; unexpected natural 
and man-made world events, such as diseases or disasters; financial, political or social disruptions, 
including terrorism and war; and U.S. trade &lt;/span&gt;&lt;/p&gt;

&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;disputes 
or other disputes with specific countries that could result in additional tariffs, trade barriers and/or 
investment restrictions in certain securities in those countries. Any of these conditions can adversely 
affect the economic prospects of many companies, sectors, nations, regions and the market in general, 
in ways that cannot necessarily be foreseen.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Ongoing or threatened armed conflicts throughout the world 
have caused and could continue to cause significant market disruptions and volatility. The hostilities 
and sanctions resulting from those hostilities could have a significant impact on certain investments 
of the Fund as well as the Fund&#x2019;s performance and liquidity.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_NewJersey2_S000006923Summary1Member"
      id="ixv-5365">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;New Jersey:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund invests predominantly in New Jersey municipal securities. Therefore, events in New Jersey are 
likely to affect the Fund&#x2019;s investments and its performance. These events may include economic 
or political policy changes, tax base erosion, unfunded pension and healthcare liabilities, constitutional 
limits on tax increases, budget deficits and other financial difficulties, and changes in the credit 
ratings assigned to municipal issuers of New Jersey. The same is true of events in other states or U.S. 
territories, to the extent that the Fund has exposure to any other state or territory at any given time.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_Focus2_S000006923Summary1Member"
      id="ixv-5369">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Focus:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund may invest more than 25% of its assets in municipal securities that finance similar types of 
projects, such as utilities, hospitals, higher education and transportation. A change that affects one 
project, such as proposed legislation on the financing of the project, a shortage of the materials needed 
for the project, or a declining need for the project, would likely affect all similar projects, thereby 
increasing market risk.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_Income2_S000006923Summary1Member"
      id="ixv-5373">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Income:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund's distributions to shareholders 
may decline when prevailing interest rates fall, when the Fund experiences defaults on debt securities 
it holds or when the Fund realizes a loss upon the sale of a debt security. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_Prepayment2_S000006923Summary1Member"
      id="ixv-5377">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Prepayment:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Prepayment risk occurs when a debt security can be repaid in whole or in part prior to the security's 
maturity and the Fund must reinvest the proceeds it receives, during periods of declining interest rates, 
in securities that pay a lower rate of interest. Also, if a security has been purchased at a premium, 
the value of the premium would be lost in the event of prepayment. Prepayments generally increase when 
interest rates fall.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_Inflation2_S000006923Summary1Member"
      id="ixv-5381">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Inflation:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;  &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The market price of debt securities generally 
falls as inflation increases because the purchasing power of the future income and repaid principal is 
expected to be worth less when received by the Fund. Debt securities that pay a fixed rather than variable 
interest rate are especially vulnerable to inflation risk because variable-rate debt securities may be 
able to participate, over the long term, in rising interest rates which have historically corresponded 
with long-term inflationary trends.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_BondInsurers2_S000006923Summary1Member"
      id="ixv-5404">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Bond 
Insurers:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Market conditions or changes to ratings criteria could adversely impact the 
ratings of municipal bond insurance companies. Downgrades and withdrawal of ratings from municipal bond 
insurers have substantially limited the availability of insurance sought by municipal bond issuers thereby 
reducing the supply of insured municipal securities.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because of the consolidation among municipal 
bond insurers the Fund is subject to additional risks including the risk that credit risk may be concentrated 
among fewer insurers and the risk that events involving one or more municipal bond insurers could have 
a significant adverse effect on the value of the securities insured by an insurer and on the municipal 
markets as a whole.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_UnratedDebtSecurities2_S000006923Summary1Member"
      id="ixv-5409">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Unrated Debt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Certain unrated debt 
securities determined by the investment manager to be of comparable credit quality to rated securities 
which the Fund may purchase may pay a higher interest rate than such rated debt securities and be subject 
to a greater risk of illiquidity or price changes. Less public information and independent credit analysis 
are typically available about unrated securities or issuers, and therefore they may be subject to greater 
risk of default.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_Management2_S000006923Summary1Member"
      id="ixv-5413">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Management:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund is subject to management risk 
because it is an actively managed investment portfolio. The Fund's investment manager applies investment 
techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee 
that these decisions will produce the desired results.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_Cybersecurity2_S000006923Summary1Member"
      id="ixv-5417">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Cybersecurity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain 
access to Fund assets, Fund or customer data (including private shareholder information), or proprietary 
information, cause the Fund, the investment manager, and/or their service providers (including, but not 
limited to, Fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) 
to suffer data breaches, data corruption or loss of operational functionality or prevent Fund investors 
from purchasing, redeeming or exchanging shares or receiving distributions. The investment manager has 
limited ability to prevent or mitigate cybersecurity incidents affecting third party service providers, 
and such third party service providers may have limited indemnification obligations to the Fund or the 
investment manager. Cybersecurity incidents may result in financial losses to the Fund and its shareholders, 
and substantial costs may be incurred in an effort to prevent or mitigate future cybersecurity incidents. 
Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value 
of these securities could decline if the issuers experience cybersecurity incidents.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because technology is 
frequently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a 
chance that some risks have not been identified or prepared for, or that an attack may not be detected, 
which puts limitations on the Fund's ability to plan for or respond to a cyber attack. Like other &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;funds 
and business enterprises, the Fund, the investment manager, and their service providers are subject to 
the risk of cyber incidents occurring from time to time.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110590">Performance</oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-5443">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future. You can obtain updated performance information 
at www.franklintempleton.com or by calling (800) DIAL BEN/342-5236.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.&lt;/p&gt;</oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110591">The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance.</oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110592">The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110593">franklintempleton.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:PerformanceAvailabilityPhone
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110594">(800) DIAL BEN/342-5236</oef:PerformanceAvailabilityPhone>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110595">Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.</oef:BarChartDoesNotReflectSalesLoads>
    <oef:BarChartHeading
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110596">Class 
A Annual Total Returns</oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-5449">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:17.33%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:68%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.67%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Best Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2023, Q4&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;7.48%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Worst Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2022, Q1&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;-6.10%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="2" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:100%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; font-size:1pt;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.12%.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
</oef:BarChartClosingTextBlock>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member"
      id="ixv-110597">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member"
      id="ixv-110598">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110599"
      unitRef="pure">0.0748</oef:BarChartHighestQuarterlyReturn>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member"
      id="ixv-110600">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member"
      id="ixv-110601">2022-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110602"
      unitRef="pure">-0.0610</oef:BarChartLowestQuarterlyReturn>
    <oef:YearToDateReturnLabel
      contextRef="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member"
      id="ixv-110603">As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.12%.</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturnDate
      contextRef="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member"
      id="ixv-110604">2026-03-31</oef:BarChartYearToDateReturnDate>
    <oef:BarChartYearToDateReturn
      contextRef="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110605"
      unitRef="pure">-0.0012</oef:BarChartYearToDateReturn>
    <oef:PerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110606">Average 
Annual Total Returns (figures reflect sales charges) For periods ended December 
31, 2025</oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_C000205902Member_S000006923Member_S000006923Summary1Member"
      id="ixv-110607">Return before taxes</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110608"
      unitRef="pure">-0.0076</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110609"
      unitRef="pure">-0.0032</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110610"
      unitRef="pure">0.0142</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205902Member_S000006923Member_S000006923Summary1Member"
      id="ixv-110611">Return after taxes on 
distributions</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110612"
      unitRef="pure">-0.0078</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110613"
      unitRef="pure">-0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110614"
      unitRef="pure">0.0141</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205902Member_S000006923Member_S000006923Summary1Member"
      id="ixv-110615">Return after taxes on distributions and sale of Fund shares</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110616"
      unitRef="pure">0.0073</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110617"
      unitRef="pure">0.0036</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110618"
      unitRef="pure">0.0176</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018781Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110619"
      unitRef="pure">-0.0069</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018781Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110620"
      unitRef="pure">-0.0018</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018781Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110621"
      unitRef="pure">0.0151</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018783Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110622"
      unitRef="pure">0.0155</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018783Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110623"
      unitRef="pure">-0.0002</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018783Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110624"
      unitRef="pure">0.0132</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000194364Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110625"
      unitRef="pure">0.0331</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000194364Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110626"
      unitRef="pure">0.0072</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20170801_20251231_C000194364Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="_803_"
      unitRef="pure">0.0202</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000068551Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110628"
      unitRef="pure">0.0326</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000068551Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110629"
      unitRef="pure">0.0068</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000068551Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110630"
      unitRef="pure">0.0201</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalBondIndex37_S000006923Member_S000006923Summary1Member"
      id="ixv-110631">Bloomberg Municipal Bond Index </oef:AverageAnnualReturnLabel>
    <oef:IndexNoDeductionForFeesExpensesTaxes
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-110632">(index reflects no deduction 
for fees, expenses or taxes)</oef:IndexNoDeductionForFeesExpensesTaxes>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalBondIndex37_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110633"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalBondIndex37_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110634"
      unitRef="pure">0.0080</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalBondIndex37_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-110635"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <oef:ProspectusDate contextRef="Context_20260228_20260228" id="ixv-110636">2026-07-01</oef:ProspectusDate>
    <oef:RiskReturnHeading
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110637">Franklin 
Alabama Tax-Free Income Fund</oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110638">Investment Goal</oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-20103">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;To 
provide investors with as high a level of income exempt from federal income taxes as is consistent with 
prudent investment management and the preservation of shareholders&#x2019; capital. The Fund also tries 
to provide a maximum level of income exempt from personal income taxes, if any, for resident shareholders 
of Alabama.&lt;/p&gt;</oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110639">Fees and Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-20107">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;These tables describe 
the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;You may pay other fees 
(including on Class R6 and Advisor Class shares), such as brokerage commissions and other fees to financial 
intermediaries, which are not reflected in the tables and examples below.&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; You may qualify for 
sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at 
least $100,000 in Franklin Templeton funds and certain other funds distributed through Franklin Distributors, 
LLC, the Fund&#x2019;s distributor. More information about these and other discounts is available from 
your financial professional and under &#x201c;Your Account&#x201d; on page 120 in the Fund&#x2019;s Prospectus 
and under &#x201c;Buying and Selling Shares&#x201d; on page 55 of the Fund&#x2019;s Statement of Additional 
Information. In addition, more information about sales charge discounts and waivers for purchases of 
shares through specific financial intermediaries is set forth in Appendix A &#x2013; &#x201c;Intermediary 
Sales Charge Discounts and Waivers&#x201d; to the Fund&#x2019;s prospectus.&lt;/span&gt;&lt;/p&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110640">You may qualify for 
sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at 
least $100,000 in Franklin Templeton funds and certain other funds distributed through Franklin Distributors, 
LLC, the Fund&#x2019;s distributor.</oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110641"
      unitRef="usd">100000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110642">Shareholder 
Fees</oef:ShareholderFeesCaption>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110643"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018753Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110644"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018754Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110645"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194353Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110646"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000173665Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110647"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="_827_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018753Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="_828_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018754Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110650"
      unitRef="pure">0.0100</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194353Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110651"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000173665Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110652"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:OperatingExpensesCaption
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110653">Annual 
Fund Operating Expenses (expenses that you pay each year as a percentage of the value 
of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110654"
      unitRef="pure">0.0057</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018753Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110655"
      unitRef="pure">0.0057</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018754Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110656"
      unitRef="pure">0.0057</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000194353Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110657"
      unitRef="pure">0.0057</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000173665Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110658"
      unitRef="pure">0.0057</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110659"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018753Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110660"
      unitRef="pure">0.0010</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018754Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110661"
      unitRef="pure">0.0065</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000194353Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110662"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000173665Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110663"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110664"
      unitRef="pure">0.0015</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018753Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110665"
      unitRef="pure">0.0015</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018754Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110666"
      unitRef="pure">0.0014</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194353Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110667"
      unitRef="pure">0.0014</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000173665Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110668"
      unitRef="pure">0.0015</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110669"
      unitRef="pure">0.0097</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018753Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110670"
      unitRef="pure">0.0082</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018754Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110671"
      unitRef="pure">0.0136</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194353Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110672"
      unitRef="pure">0.0071</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000173665Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110673"
      unitRef="pure">0.0072</oef:ExpensesOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="_853_"
      unitRef="pure">-0.0007</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000018753Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="_854_"
      unitRef="pure">-0.0007</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000018754Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="_855_"
      unitRef="pure">-0.0006</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000194353Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="_856_"
      unitRef="pure">-0.0009</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000173665Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="_857_"
      unitRef="pure">-0.0007</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110679"
      unitRef="pure">0.0090</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018753Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110680"
      unitRef="pure">0.0075</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018754Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110681"
      unitRef="pure">0.0130</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194353Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110682"
      unitRef="pure">0.0062</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000173665Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110683"
      unitRef="pure">0.0065</oef:NetExpensesOverAssets>
    <oef:ExpenseExampleHeading
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110684">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-20434">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;This 
Example is intended to help you compare the cost of investing in the Fund with the cost of investing 
in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated 
and then redeem all of your shares at the end of the period. The Example also assumes that your investment 
has a 5% return each year and that the Fund's operating expenses remain the same. The Example reflects 
adjustments made to the Fund's operating expenses due to the fee waivers and/or expense reimbursements 
by management for the 1 Year numbers only. Although your actual costs may be higher or lower, based on 
these assumptions your costs would be:&lt;/p&gt;</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110685"
      unitRef="usd">463</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110686"
      unitRef="usd">665</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110687"
      unitRef="usd">884</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110688"
      unitRef="usd">1514</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018753Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110689"
      unitRef="usd">449</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018753Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110690"
      unitRef="usd">621</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018753Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110691"
      unitRef="usd">807</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018753Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110692"
      unitRef="usd">1345</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018754Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110693"
      unitRef="usd">232</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018754Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110694"
      unitRef="usd">425</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018754Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110695"
      unitRef="usd">739</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018754Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110696"
      unitRef="usd">1524</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000194353Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110697"
      unitRef="usd">63</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000194353Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110698"
      unitRef="usd">218</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000194353Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110699"
      unitRef="usd">386</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000194353Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110700"
      unitRef="usd">874</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000173665Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110701"
      unitRef="usd">66</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000173665Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110702"
      unitRef="usd">223</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000173665Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110703"
      unitRef="usd">393</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000173665Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110704"
      unitRef="usd">888</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionByYearCaption
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110705">If you do not sell your shares:</oef:ExpenseExampleNoRedemptionByYearCaption>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Context_20260228_20260228_C000018754Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110706"
      unitRef="usd">132</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Context_20260228_20260228_C000018754Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110707"
      unitRef="usd">425</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Context_20260228_20260228_C000018754Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110708"
      unitRef="usd">739</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Context_20260228_20260228_C000018754Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110709"
      unitRef="usd">1524</oef:ExpenseExampleNoRedemptionYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110710">Portfolio 
Turnover</oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-20621">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities 
(or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs 
and may result in higher taxes when Fund shares are held &lt;/p&gt;

&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;in 
a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, 
affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate 
was 15.17% of the average value of its portfolio.&lt;/p&gt;</oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110711"
      unitRef="pure">0.1517</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110712">Principal 
Investment Strategies</oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-20645">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Under normal market conditions, the Fund invests at least 
80% of its total assets in securities whose interest is free from federal income taxes, including the 
federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 
80% of its total assets in securities that pay interest free from the personal income taxes, if any, 
of Alabama. &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the Fund tries to invest all of its assets in tax-free securities, it 
is possible that up to 20% of the Fund's total assets may be in securities that pay interest that may 
be subject to the federal alternative minimum tax and in securities that pay interest subject to other 
federal or state income taxes.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund only buys municipal securities rated, at the time of purchase, in one 
of the top four ratings categories by one or more U.S. nationally recognized rating services (or unrated 
or short-term rated securities of comparable credit quality).&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund also may invest up to 35% of its 
total assets in municipal securities issued by U.S. territories.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the investment manager will search 
for investments across a large number of municipal securities that finance different types of projects, 
from time to time, based on economic conditions, the Fund may have significant positions in municipal 
securities that finance similar types of projects.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The investment manager selects securities that it believes 
will provide the best balance between risk and return within the Fund&#x2019;s range of allowable investments 
and typically invests with a long-term time horizon. This means it generally holds securities in the 
Fund&#x2019;s portfolio for income purposes, although the investment manager may sell a security at any 
time if it believes it could help the Fund meet its goal. With a focus on income, individual securities 
are considered for purchase or sale based on various factors and considerations, including credit profile, 
risk, structure, pricing, portfolio impact, duration management, restructuring, opportunistic trading 
and tax loss harvesting opportunities. &lt;/p&gt;</oef:StrategyNarrativeTextBlock>
    <oef:StrategyPortfolioConcentration
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110713">Under normal market conditions, the Fund invests at least 
80% of its total assets in securities whose interest is free from federal income taxes, including the 
federal alternative minimum tax.</oef:StrategyPortfolioConcentration>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110714">Under normal market conditions, the Fund invests at least 
80% of its total assets in securities whose interest is free from federal income taxes, including the 
federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 
80% of its total assets in securities that pay interest free from the personal income taxes, if any, 
of Alabama</fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110715">Under normal market conditions, the Fund invests at least 
80% of its total assets in securities whose interest is free from federal income taxes, including the 
federal alternative minimum tax. In addition, under normal market conditions, the Fund invests at least 
80% of its total assets in securities that pay interest free from the personal income taxes, if any, 
of Alabama</fnd:NmRule35d1TermDfnSmryTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_PrincipalRisks2_S000006911Summary2Member"
      id="ixv-20652">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:13.0pt; font-family:Arial; text-align:left; color:#004C97; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:13.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:normal; text-decoration:none;"&gt;Principal Risks&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;You 
could lose money by investing in the Fund. Mutual fund shares are not deposits or obligations of, or 
guaranteed or endorsed by, any bank, and are not insured by the Federal Deposit Insurance Corporation, 
the Federal Reserve Board, or any other agency of the U.S. government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_RiskLoseMoneyMember_S000006911Summary2Member"
      id="ixv-110718">You 
could lose money by investing in the Fund.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_RiskNotInsuredMember_S000006911Summary2Member"
      id="ixv-110719">Mutual fund shares are not deposits or obligations of, or 
guaranteed or endorsed by, any bank, and are not insured by the Federal Deposit Insurance Corporation, 
the Federal Reserve Board, or any other agency of the U.S. government.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_InterestRate2_S000006911Summary2Member"
      id="ixv-20674">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Interest 
Rate:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 When interest rates rise, debt security prices generally fall. The opposite is also generally true: 
debt security prices rise when interest rates fall. Interest rate changes are influenced by a number 
of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, 
and supply of and demand for bonds. In general, securities with longer maturities or durations are more 
sensitive to interest rate changes. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_Credit2_S000006911Summary2Member"
      id="ixv-20678">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Credit:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  An issuer of debt securities may fail 
to make interest payments or repay principal when due, in whole or in part. Changes in an issuer's financial 
strength or in a security's or government's credit rating may affect a security's value. A change in 
the credit rating of a municipal bond insurer that insures securities in the Fund&#x2019;s portfolio may 
affect the value of the securities it insures, the Fund&#x2019;s share price and Fund performance. The 
Fund might also be adversely impacted by the inability of an insurer to meet its insurance obligations.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_Liquidity2_S000006911Summary2Member"
      id="ixv-20682">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The trading market for a particular security or type of security or other investments in which the Fund 
invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the 
Fund&#x2019;s ability to sell such securities or other investments when necessary to meet the Fund&#x2019;s 
liquidity needs, which may arise or increase in response to a specific economic event or because the 
investment manager wishes to purchase particular investments or believes that a higher level of liquidity 
would be advantageous. Reduced liquidity will also generally lower the value of such securities or other 
investments. Market prices for such securities or other investments may be relatively volatile.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_TaxLegislativeandPoliticalChanges2_S000006911Summary2Member"
      id="ixv-20686">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax 
Legislative and Political Changes:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The municipal securities market could be significantly affected 
by adverse political and legislative changes or litigation at the federal or state level. The value of 
municipal bonds is closely tied to the benefits of tax-exempt income to investors. Significant revisions 
of federal income tax laws or regulations revising income tax rates or the tax-exempt character of municipal 
bonds, or even proposed changes and deliberations on this topic by the federal government, could cause 
municipal bond prices to fall. For example, lower federal income tax rates would reduce certain relative 
advantages of owning municipal bonds, and lower state income tax rates could have similar effects. In 
addition, the application of corporate minimum tax rates to financial statement income may have the effect 
of reducing demand for municipal bonds among corporate investors, which may in turn impact municipal 
bond prices.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_Tax-ExemptSecurities2_S000006911Summary2Member"
      id="ixv-20690">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax-Exempt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Failure of a municipal security issuer 
to comply with applicable tax requirements may make income paid thereon taxable, resulting in a decline 
in the security&#x2019;s value. In addition, there could be changes in applicable tax laws or tax treatments 
that reduce or eliminate the current federal income tax exemption on municipal securities or otherwise 
adversely affect the current federal or state tax status of municipal securities.&lt;/span&gt;&lt;/p&gt;
</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_Market2_S000006911Summary2Member"
      id="ixv-20713">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Market: 
 &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The 
market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly 
or unpredictably. The market value of a security or other investment may be reduced by market activity 
or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all 
investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more 
buyers than sellers, prices tend to rise. In addition, the value of the Fund&#x2019;s investments may 
go up or down due to general market or other conditions that are not specifically related to a particular 
issuer, such as: real or perceived adverse economic changes, including widespread liquidity issues and 
defaults in one or more industries; changes in interest, inflation or exchange rates; unexpected natural 
and man-made world events, such as diseases or disasters; financial, political or social disruptions, 
including terrorism and war; and U.S. trade disputes or other disputes with specific countries that could 
result in additional tariffs, trade barriers and/or investment restrictions in certain securities in 
those countries. Any of these conditions can adversely affect the economic prospects of many companies, 
sectors, nations, regions and the market in general, in ways that cannot necessarily be foreseen.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Ongoing 
or threatened armed conflicts throughout the world have caused and could continue to cause significant 
market disruptions and volatility. The hostilities and sanctions resulting from those hostilities could 
have a significant impact on certain investments of the Fund as well as the Fund&#x2019;s performance 
and liquidity.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_Alabama2_S000006911Summary2Member"
      id="ixv-20718">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Alabama:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund invests predominantly in Alabama 
municipal securities. Therefore, events in Alabama are likely to affect the Fund&#x2019;s investments 
and its performance. These events may include economic or political policy changes, tax base erosion, 
unfunded pension and healthcare liabilities, constitutional limits on tax increases, budget deficits 
and other financial difficulties, and changes in the credit ratings assigned to municipal issuers of 
Alabama. The same is true of events in other states or U.S. territories, to the extent that the Fund 
has exposure to any other state or territory at any given time.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_Focus2_S000006911Summary2Member"
      id="ixv-20722">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Focus:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund may invest more than 25% of its assets in municipal securities that finance similar types of 
projects, such as utilities, hospitals, higher education and transportation. A change that affects one 
project, such as proposed legislation on the financing of the project, a shortage of the materials needed 
for the project, or a declining need for the project, would likely affect all similar projects, thereby 
increasing market risk.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_Income2_S000006911Summary2Member"
      id="ixv-20726">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Income:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund's distributions to shareholders 
may decline when prevailing interest rates fall, when the Fund experiences defaults on debt securities 
it holds or when the Fund realizes a loss upon the sale of a debt security. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_Prepayment2_S000006911Summary2Member"
      id="ixv-20730">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Prepayment:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Prepayment risk occurs when a debt security can be repaid in whole or in part prior to the security's 
maturity and the Fund must reinvest the proceeds it &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;receives, 
during periods of declining interest rates, in securities that pay a lower rate of interest. Also, if 
a security has been purchased at a premium, the value of the premium would be lost in the event of prepayment. 
Prepayments generally increase when interest rates fall.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_Inflation2_S000006911Summary2Member"
      id="ixv-20754">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Inflation:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;  &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The market price of 
debt securities generally falls as inflation increases because the purchasing power of the future income 
and repaid principal is expected to be worth less when received by the Fund. Debt securities that pay 
a fixed rather than variable interest rate are especially vulnerable to inflation risk because variable-rate 
debt securities may be able to participate, over the long term, in rising interest rates which have historically 
corresponded with long-term inflationary trends.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_BondInsurers2_S000006911Summary2Member"
      id="ixv-20759">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Bond Insurers:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Market conditions or changes to ratings criteria could adversely impact the ratings of municipal bond 
insurance companies. Downgrades and withdrawal of ratings from municipal bond insurers have substantially 
limited the availability of insurance sought by municipal bond issuers thereby reducing the supply of 
insured municipal securities.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because of the consolidation among municipal bond insurers 
the Fund is subject to additional risks including the risk that credit risk may be concentrated among 
fewer insurers and the risk that events involving one or more municipal bond insurers could have a significant 
adverse effect on the value of the securities insured by an insurer and on the municipal markets as a 
whole.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_UnratedDebtSecurities2_S000006911Summary2Member"
      id="ixv-20764">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Unrated 
Debt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Certain unrated debt securities determined by the investment manager to be of 
comparable credit quality to rated securities which the Fund may purchase may pay a higher interest rate 
than such rated debt securities and be subject to a greater risk of illiquidity or price changes. Less 
public information and independent credit analysis are typically available about unrated securities or 
issuers, and therefore they may be subject to greater risk of default.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_Management2_S000006911Summary2Member"
      id="ixv-20768">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Management:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund is subject to management risk because it is an actively managed investment portfolio. The Fund's 
investment manager applies investment techniques and risk analyses in making investment decisions for 
the Fund, but there can be no guarantee that these decisions will produce the desired results.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_Cybersecurity2_S000006911Summary2Member"
      id="ixv-20772">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Cybersecurity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain 
access to Fund assets, Fund or customer data (including private shareholder information), or proprietary 
information, cause the Fund, the investment manager, and/or their service providers (including, but not 
limited to, Fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) 
to suffer data breaches, data corruption or loss of operational functionality or prevent Fund investors 
from purchasing, redeeming or exchanging shares or receiving distributions. The investment manager has 
limited ability to prevent or mitigate cybersecurity incidents affecting third party service &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;providers, 
and such third party service providers may have limited indemnification obligations to the Fund or the 
investment manager. Cybersecurity incidents may result in financial losses to the Fund and its shareholders, 
and substantial costs may be incurred in an effort to prevent or mitigate future cybersecurity incidents. 
Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value 
of these securities could decline if the issuers experience cybersecurity incidents.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because technology is 
frequently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a 
chance that some risks have not been identified or prepared for, or that an attack may not be detected, 
which puts limitations on the Fund's ability to plan for or respond to a cyber attack. Like other funds 
and business enterprises, the Fund, the investment manager, and their service providers are subject to 
the risk of cyber incidents occurring from time to time.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110720">Performance</oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-20799">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
following bar chart and table provide some indication of the risks of investing in the Fund. The bar 
chart shows changes in the Fund's performance from year to year for Class A shares. The table shows how 
the Fund's average annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared 
with those of a broad measure of market performance. The Fund's past performance (before and after taxes) 
is not necessarily an indication of how the Fund will perform in the future. You can obtain updated performance 
information at www.franklintempleton.com or by calling (800) DIAL BEN/342-5236.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Sales charges are not 
reflected in the bar chart, and if those charges were included, returns would be less than those shown.&lt;/p&gt;</oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110721">The 
following bar chart and table provide some indication of the risks of investing in the Fund. The bar 
chart shows changes in the Fund's performance from year to year for Class A shares. The table shows how 
the Fund's average annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared 
with those of a broad measure of market performance.</oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110722">The Fund's past performance (before and after taxes) 
is not necessarily an indication of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110723">franklintempleton.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:PerformanceAvailabilityPhone
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110724">(800) DIAL BEN/342-5236</oef:PerformanceAvailabilityPhone>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110725">Sales charges are not 
reflected in the bar chart, and if those charges were included, returns would be less than those shown.</oef:BarChartDoesNotReflectSalesLoads>
    <oef:BarChartHeading
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110726">Class A Annual Total Returns</oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-20823">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:17.33%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:68%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.67%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Best Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2023, Q4&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;8.92%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Worst Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2022, Q1&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;-6.32%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="2" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:100%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; font-size:1pt;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.35%.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</oef:BarChartClosingTextBlock>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      id="ixv-110727">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      id="ixv-110728">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110729"
      unitRef="pure">0.0892</oef:BarChartHighestQuarterlyReturn>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      id="ixv-110730">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      id="ixv-110731">2022-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110732"
      unitRef="pure">-0.0632</oef:BarChartLowestQuarterlyReturn>
    <oef:YearToDateReturnLabel
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      id="ixv-110733">As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.35%.</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturnDate
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      id="ixv-110734">2026-03-31</oef:BarChartYearToDateReturnDate>
    <oef:BarChartYearToDateReturn
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110735"
      unitRef="pure">-0.0035</oef:BarChartYearToDateReturn>
    <oef:PerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110736">Average Annual Total Returns (figures 
reflect sales charges) For periods ended December 31, 2025</oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      id="ixv-110737">Return before taxes</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110738"
      unitRef="pure">-0.0087</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110739"
      unitRef="pure">-0.0060</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110740"
      unitRef="pure">0.0130</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205892Member_S000006911Member_S000006911Summary2Member"
      id="ixv-110741">Return after taxes on 
distributions</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110742"
      unitRef="pure">-0.0089</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110743"
      unitRef="pure">-0.0061</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110744"
      unitRef="pure">0.0130</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205892Member_S000006911Member_S000006911Summary2Member"
      id="ixv-110745">Return after taxes on distributions and sale of Fund shares</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110746"
      unitRef="pure">0.0059</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110747"
      unitRef="pure">0.0007</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110748"
      unitRef="pure">0.0161</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018753Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110749"
      unitRef="pure">-0.0076</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018753Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110750"
      unitRef="pure">-0.0044</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018753Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110751"
      unitRef="pure">0.0141</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018754Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110752"
      unitRef="pure">0.0154</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018754Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110753"
      unitRef="pure">-0.0026</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018754Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110754"
      unitRef="pure">0.0121</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000194353Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110755"
      unitRef="pure">0.0329</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000194353Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110756"
      unitRef="pure">0.0047</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20170801_20251231_C000194353Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="_970_"
      unitRef="pure">0.0179</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000173665Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110758"
      unitRef="pure">0.0326</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000173665Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110759"
      unitRef="pure">0.0042</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000173665Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110760"
      unitRef="pure">0.0189</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalBondIndex38_S000006911Member_S000006911Summary2Member"
      id="ixv-110761">Bloomberg Municipal Bond 
Index </oef:AverageAnnualReturnLabel>
    <oef:IndexNoDeductionForFeesExpensesTaxes
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-110762">(index reflects no deduction for fees, expenses or taxes)</oef:IndexNoDeductionForFeesExpensesTaxes>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalBondIndex38_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110763"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalBondIndex38_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110764"
      unitRef="pure">0.0080</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalBondIndex38_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-110765"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110766">Franklin 
Georgia Tax-Free Income Fund</oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110767">Investment Goal</oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-21209">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;To provide investors with 
as high a level of income exempt from federal income taxes as is consistent with prudent investment management 
and the preservation of shareholders&#x2019; capital. The Fund also tries to provide a maximum level of 
income exempt from personal income taxes, if any, for resident shareholders of Georgia.&lt;/p&gt;</oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110768">Fees and 
Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-21212">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;These tables describe the fees and expenses that you may pay if you buy, hold 
and sell shares of the Fund. &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;You may pay other fees (including on Class R6 and Advisor Class 
shares), such as brokerage commissions and other fees to financial intermediaries, which are not reflected 
in the tables and examples below.&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor. 
More information about these and other discounts is available from your financial professional and under 
&#x201c;Your Account&#x201d; on page 120 in the Fund&#x2019;s Prospectus and under &#x201c;Buying and Selling 
Shares&#x201d; on page 55 of the Fund&#x2019;s Statement of Additional Information. In addition, more information 
about sales charge discounts and waivers for purchases of shares through specific financial intermediaries 
is set forth in Appendix A &#x2013; &#x201c;Intermediary Sales Charge Discounts and Waivers&#x201d; to the 
Fund&#x2019;s prospectus.&lt;/span&gt;&lt;/p&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110769">You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor.</oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110770"
      unitRef="usd">100000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110771">Shareholder Fees</oef:ShareholderFeesCaption>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110772"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018755Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110773"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018756Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110774"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194354Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110775"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000173666Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110776"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="_992_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018755Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="_993_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018756Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110779"
      unitRef="pure">0.0100</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194354Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110780"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000173666Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110781"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:OperatingExpensesCaption
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110782">Annual 
Fund Operating Expenses (expenses that you pay each year as a percentage of the value 
of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110783"
      unitRef="pure">0.0054</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018755Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110784"
      unitRef="pure">0.0054</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018756Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110785"
      unitRef="pure">0.0054</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000194354Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110786"
      unitRef="pure">0.0054</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000173666Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110787"
      unitRef="pure">0.0054</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110788"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018755Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110789"
      unitRef="pure">0.0010</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018756Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110790"
      unitRef="pure">0.0065</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000194354Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110791"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000173666Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110792"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110793"
      unitRef="pure">0.0013</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018755Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110794"
      unitRef="pure">0.0013</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018756Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110795"
      unitRef="pure">0.0012</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194354Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110796"
      unitRef="pure">0.0008</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000173666Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110797"
      unitRef="pure">0.0013</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110798"
      unitRef="pure">0.0092</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018755Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110799"
      unitRef="pure">0.0077</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018756Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110800"
      unitRef="pure">0.0131</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194354Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110801"
      unitRef="pure">0.0062</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000173666Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110802"
      unitRef="pure">0.0067</oef:ExpensesOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="_1018_"
      unitRef="pure">-0.0002</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000018755Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="_1019_"
      unitRef="pure">-0.0002</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000018756Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="_1020_"
      unitRef="pure">-0.0001</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000194354Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="_1021_"
      unitRef="pure">0</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000173666Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="_1022_"
      unitRef="pure">-0.0002</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110808"
      unitRef="pure">0.0090</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018755Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110809"
      unitRef="pure">0.0075</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018756Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110810"
      unitRef="pure">0.0130</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194354Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110811"
      unitRef="pure">0.0062</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000173666Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110812"
      unitRef="pure">0.0065</oef:NetExpensesOverAssets>
    <oef:ExpenseExampleHeading
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110813">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-21539">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;This 
Example is intended to help you compare the cost of investing in the Fund with the cost of investing 
in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated 
and then redeem all of your shares at the end of the period. The Example also assumes that your investment 
has a 5% return each year and that the Fund's operating expenses remain the same. The Example reflects 
adjustments made to the Fund's operating expenses due to the fee waivers and/or expense reimbursements 
by management for the 1 Year numbers only. Although your actual costs may be higher or lower, based on 
these assumptions your costs would be:&lt;/p&gt;</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110814"
      unitRef="usd">463</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110815"
      unitRef="usd">655</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110816"
      unitRef="usd">863</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110817"
      unitRef="usd">1462</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018755Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110818"
      unitRef="usd">449</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018755Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110819"
      unitRef="usd">610</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018755Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110820"
      unitRef="usd">785</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018755Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110821"
      unitRef="usd">1291</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018756Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110822"
      unitRef="usd">232</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018756Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110823"
      unitRef="usd">413</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018756Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110824"
      unitRef="usd">716</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018756Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110825"
      unitRef="usd">1470</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000194354Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110826"
      unitRef="usd">63</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000194354Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110827"
      unitRef="usd">198</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000194354Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110828"
      unitRef="usd">345</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000194354Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110829"
      unitRef="usd">774</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000173666Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110830"
      unitRef="usd">66</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000173666Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110831"
      unitRef="usd">212</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000173666Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110832"
      unitRef="usd">371</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000173666Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110833"
      unitRef="usd">832</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionByYearCaption
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110834">If you do not sell your shares:</oef:ExpenseExampleNoRedemptionByYearCaption>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Context_20260228_20260228_C000018756Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110835"
      unitRef="usd">132</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Context_20260228_20260228_C000018756Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110836"
      unitRef="usd">413</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Context_20260228_20260228_C000018756Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110837"
      unitRef="usd">716</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Context_20260228_20260228_C000018756Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110838"
      unitRef="usd">1470</oef:ExpenseExampleNoRedemptionYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110839">Portfolio 
Turnover</oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-21725">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities 
(or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs 
and may result in higher taxes when Fund shares are held &lt;/p&gt;

&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;in 
a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, 
affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate 
was 10.73% of the average value of its portfolio.&lt;/p&gt;</oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110840"
      unitRef="pure">0.1073</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110841">Principal Investment Strategies</oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-21748">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Under 
normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax. In addition, under 
normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest 
free from the personal income taxes, if any, of Georgia. &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the Fund tries to invest all of 
its assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in 
securities that pay interest that may be subject to the federal alternative minimum tax and in securities 
that pay interest subject to other federal or state income taxes.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund only buys municipal securities rated, 
at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized 
rating services (or unrated or short-term rated securities of comparable credit quality).&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund also may invest 
up to 35% of its total assets in municipal securities issued by U.S. territories.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the investment 
manager will search for investments across a large number of municipal securities that finance different 
types of projects, from time to time, based on economic conditions, the Fund may have significant positions 
in municipal securities that finance similar types of projects.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The investment manager selects securities 
that it believes will provide the best balance between risk and return within the Fund&#x2019;s range 
of allowable investments and typically invests with a long-term time horizon. This means it generally 
holds securities in the Fund&#x2019;s portfolio for income purposes, although the investment manager may 
sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, 
individual securities are considered for purchase or sale based on various factors and considerations, 
including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, 
opportunistic trading and tax loss harvesting opportunities. &lt;/p&gt;</oef:StrategyNarrativeTextBlock>
    <oef:StrategyPortfolioConcentration
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110842">Under 
normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax.</oef:StrategyPortfolioConcentration>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110843">Under 
normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax. In addition, under 
normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest 
free from the personal income taxes, if any, of Georgia</fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110844">Under 
normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax. In addition, under 
normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest 
free from the personal income taxes, if any, of Georgia</fnd:NmRule35d1TermDfnSmryTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_PrincipalRisks2_S000006912Summary2Member"
      id="ixv-21755">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:13.0pt; font-family:Arial; text-align:left; color:#004C97; font-weight:normal; text-decoration:none;"&gt;Principal Risks&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;You could lose money by 
investing in the Fund. Mutual fund shares are not deposits or obligations of, or guaranteed or endorsed 
by, any bank, and are not insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, 
or any other agency of the U.S. government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_RiskLoseMoneyMember_S000006912Summary2Member"
      id="ixv-110847">You could lose money by 
investing in the Fund.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_RiskNotInsuredMember_S000006912Summary2Member"
      id="ixv-110848">Mutual fund shares are not deposits or obligations of, or guaranteed or endorsed 
by, any bank, and are not insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, 
or any other agency of the U.S. government.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_InterestRate2_S000006912Summary2Member"
      id="ixv-21776">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Interest 
Rate:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 When interest rates rise, debt security prices generally fall. The opposite is also generally true: 
debt security prices rise when interest rates fall. Interest rate changes are influenced by a number 
of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, 
and supply of and demand for bonds. In general, securities with longer maturities or durations are more 
sensitive to interest rate changes. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_Credit2_S000006912Summary2Member"
      id="ixv-21780">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Credit:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  An issuer of debt securities may fail 
to make interest payments or repay principal when due, in whole or in part. Changes in an issuer's financial 
strength or in a security's or government's credit rating may affect a security's value. A change in 
the credit rating of a municipal bond insurer that insures securities in the Fund&#x2019;s portfolio may 
affect the value of the securities it insures, the Fund&#x2019;s share price and Fund performance. The 
Fund might also be adversely impacted by the inability of an insurer to meet its insurance obligations.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_Liquidity2_S000006912Summary2Member"
      id="ixv-21784">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The trading market for a particular security or type of security or other investments in which the Fund 
invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the 
Fund&#x2019;s ability to sell such securities or other investments when necessary to meet the Fund&#x2019;s 
liquidity needs, which may arise or increase in response to a specific economic event or because the 
investment manager wishes to purchase particular investments or believes that a higher level of liquidity 
would be advantageous. Reduced liquidity will also generally lower the value of such securities or other 
investments. Market prices for such securities or other investments may be relatively volatile.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_TaxLegislativeandPoliticalChanges2_S000006912Summary2Member"
      id="ixv-21788">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax 
Legislative and Political Changes:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The municipal securities market could be significantly affected 
by adverse political and legislative changes or litigation at the federal or state level. The value of 
municipal bonds is closely tied to the benefits of tax-exempt income to investors. Significant revisions 
of federal income tax laws or regulations revising income tax rates or the tax-exempt character of municipal 
bonds, or even proposed changes and deliberations on this topic by the federal government, could cause 
municipal bond prices to fall. For example, lower federal income tax rates would reduce certain relative 
advantages of owning municipal bonds, and lower state income tax rates could have similar effects. In 
addition, the application of corporate minimum tax rates to financial statement income may have the effect 
of reducing demand for municipal bonds among corporate investors, which may in turn impact municipal 
bond prices.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_Tax-ExemptSecurities2_S000006912Summary2Member"
      id="ixv-21792">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax-Exempt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Failure of a municipal security issuer 
to comply with applicable tax requirements may make income paid thereon taxable, resulting in a decline 
in the security&#x2019;s value. In addition, there could be changes in applicable tax laws or tax treatments 
that reduce or eliminate the current federal income tax exemption on municipal securities or otherwise 
adversely affect the current federal or state tax status of municipal securities.&lt;/span&gt;&lt;/p&gt;
</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_Market2_S000006912Summary2Member"
      id="ixv-21815">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Market: 
 &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The 
market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly 
or unpredictably. The market value of a security or other investment may be reduced by market activity 
or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all 
investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more 
buyers than sellers, prices tend to rise. In addition, the value of the Fund&#x2019;s investments may 
go up or down due to general market or other conditions that are not specifically related to a particular 
issuer, such as: real or perceived adverse economic changes, including widespread liquidity issues and 
defaults in one or more industries; changes in interest, inflation or exchange rates; unexpected natural 
and man-made world events, such as diseases or disasters; financial, political or social disruptions, 
including terrorism and war; and U.S. trade disputes or other disputes with specific countries that could 
result in additional tariffs, trade barriers and/or investment restrictions in certain securities in 
those countries. Any of these conditions can adversely affect the economic prospects of many companies, 
sectors, nations, regions and the market in general, in ways that cannot necessarily be foreseen.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Ongoing 
or threatened armed conflicts throughout the world have caused and could continue to cause significant 
market disruptions and volatility. The hostilities and sanctions resulting from those hostilities could 
have a significant impact on certain investments of the Fund as well as the Fund&#x2019;s performance 
and liquidity.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_Georgia2_S000006912Summary2Member"
      id="ixv-21820">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Georgia:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund invests predominantly in Georgia 
municipal securities. Therefore, events in Georgia are likely to affect the Fund&#x2019;s investments 
and its performance. These events may include economic or political policy changes, tax base erosion, 
unfunded pension and healthcare liabilities, constitutional limits on tax increases, budget deficits 
and other financial difficulties, and changes in the credit ratings assigned to municipal issuers of 
Georgia. The same is true of events in other states or U.S. territories, to the extent that the Fund 
has exposure to any other state or territory at any given time.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_Focus2_S000006912Summary2Member"
      id="ixv-21824">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Focus:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund may invest more than 25% of its assets in municipal securities that finance similar types of 
projects, such as utilities, hospitals, higher education and transportation. A change that affects one 
project, such as proposed legislation on the financing of the project, a shortage of the materials needed 
for the project, or a declining need for the project, would likely affect all similar projects, thereby 
increasing market risk.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_Income2_S000006912Summary2Member"
      id="ixv-21828">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Income:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund's distributions to shareholders 
may decline when prevailing interest rates fall, when the Fund experiences defaults on debt securities 
it holds or when the Fund realizes a loss upon the sale of a debt security. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_Prepayment2_S000006912Summary2Member"
      id="ixv-21832">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Prepayment:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Prepayment risk occurs when a debt security can be repaid in whole or in part prior to the security's 
maturity and the Fund must reinvest the proceeds it &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;receives, 
during periods of declining interest rates, in securities that pay a lower rate of interest. Also, if 
a security has been purchased at a premium, the value of the premium would be lost in the event of prepayment. 
Prepayments generally increase when interest rates fall.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_Inflation2_S000006912Summary2Member"
      id="ixv-21856">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Inflation:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;  &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The market price of 
debt securities generally falls as inflation increases because the purchasing power of the future income 
and repaid principal is expected to be worth less when received by the Fund. Debt securities that pay 
a fixed rather than variable interest rate are especially vulnerable to inflation risk because variable-rate 
debt securities may be able to participate, over the long term, in rising interest rates which have historically 
corresponded with long-term inflationary trends.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_BondInsurers2_S000006912Summary2Member"
      id="ixv-21861">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Bond Insurers:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Market conditions or changes to ratings criteria could adversely impact the ratings of municipal bond 
insurance companies. Downgrades and withdrawal of ratings from municipal bond insurers have substantially 
limited the availability of insurance sought by municipal bond issuers thereby reducing the supply of 
insured municipal securities.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because of the consolidation among municipal bond insurers 
the Fund is subject to additional risks including the risk that credit risk may be concentrated among 
fewer insurers and the risk that events involving one or more municipal bond insurers could have a significant 
adverse effect on the value of the securities insured by an insurer and on the municipal markets as a 
whole.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_UnratedDebtSecurities2_S000006912Summary2Member"
      id="ixv-21866">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Unrated 
Debt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Certain unrated debt securities determined by the investment manager to be of 
comparable credit quality to rated securities which the Fund may purchase may pay a higher interest rate 
than such rated debt securities and be subject to a greater risk of illiquidity or price changes. Less 
public information and independent credit analysis are typically available about unrated securities or 
issuers, and therefore they may be subject to greater risk of default.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_Management2_S000006912Summary2Member"
      id="ixv-21870">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Management:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund is subject to management risk because it is an actively managed investment portfolio. The Fund's 
investment manager applies investment techniques and risk analyses in making investment decisions for 
the Fund, but there can be no guarantee that these decisions will produce the desired results.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_Cybersecurity2_S000006912Summary2Member"
      id="ixv-21874">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Cybersecurity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain 
access to Fund assets, Fund or customer data (including private shareholder information), or proprietary 
information, cause the Fund, the investment manager, and/or their service providers (including, but not 
limited to, Fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) 
to suffer data breaches, data corruption or loss of operational functionality or prevent Fund investors 
from purchasing, redeeming or exchanging shares or receiving distributions. The investment manager has 
limited ability to prevent or mitigate cybersecurity incidents affecting third party service &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;providers, 
and such third party service providers may have limited indemnification obligations to the Fund or the 
investment manager. Cybersecurity incidents may result in financial losses to the Fund and its shareholders, 
and substantial costs may be incurred in an effort to prevent or mitigate future cybersecurity incidents. 
Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value 
of these securities could decline if the issuers experience cybersecurity incidents.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because technology is 
frequently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a 
chance that some risks have not been identified or prepared for, or that an attack may not be detected, 
which puts limitations on the Fund's ability to plan for or respond to a cyber attack. Like other funds 
and business enterprises, the Fund, the investment manager, and their service providers are subject to 
the risk of cyber incidents occurring from time to time.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110849">Performance</oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-21900">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future. You can obtain updated performance information 
at www.franklintempleton.com or by calling (800) DIAL BEN/342-5236.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.&lt;/p&gt;</oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110850">The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance.</oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110851">The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110852">franklintempleton.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:PerformanceAvailabilityPhone
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110853">(800) DIAL BEN/342-5236</oef:PerformanceAvailabilityPhone>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110854">Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.</oef:BarChartDoesNotReflectSalesLoads>
    <oef:BarChartHeading
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110855">Class A Annual Total Returns</oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-21924">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:17.33%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:68%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.67%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Best Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2023, Q4&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;8.92%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Worst Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2022, Q1&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;-6.42%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="2" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:100%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; font-size:1pt;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.31%.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</oef:BarChartClosingTextBlock>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      id="ixv-110856">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      id="ixv-110857">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110858"
      unitRef="pure">0.0892</oef:BarChartHighestQuarterlyReturn>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      id="ixv-110859">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      id="ixv-110860">2022-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110861"
      unitRef="pure">-0.0642</oef:BarChartLowestQuarterlyReturn>
    <oef:YearToDateReturnLabel
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      id="ixv-110862">As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.31%.</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturnDate
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      id="ixv-110863">2026-03-31</oef:BarChartYearToDateReturnDate>
    <oef:BarChartYearToDateReturn
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110864"
      unitRef="pure">-0.0031</oef:BarChartYearToDateReturn>
    <oef:PerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110865">Average Annual Total Returns (figures 
reflect sales charges) For periods ended December 31, 2025</oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      id="ixv-110866">Return before taxes</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110867"
      unitRef="pure">-0.0093</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110868"
      unitRef="pure">-0.0071</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110869"
      unitRef="pure">0.0108</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205893Member_S000006912Member_S000006912Summary2Member"
      id="ixv-110870">Return after taxes on 
distributions</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110871"
      unitRef="pure">-0.0094</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110872"
      unitRef="pure">-0.0072</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110873"
      unitRef="pure">0.0107</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205893Member_S000006912Member_S000006912Summary2Member"
      id="ixv-110874">Return after taxes on distributions and sale of Fund shares</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110875"
      unitRef="pure">0.0061</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110876"
      unitRef="pure">0.0003</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110877"
      unitRef="pure">0.0146</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018755Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110878"
      unitRef="pure">-0.0074</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018755Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110879"
      unitRef="pure">-0.0056</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018755Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110880"
      unitRef="pure">0.0118</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018756Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110881"
      unitRef="pure">0.0147</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018756Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110882"
      unitRef="pure">-0.0041</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018756Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110883"
      unitRef="pure">0.0099</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000194354Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110884"
      unitRef="pure">0.0322</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000194354Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110885"
      unitRef="pure">0.0034</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20170801_20251231_C000194354Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="_1135_"
      unitRef="pure">0.0166</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000173666Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110887"
      unitRef="pure">0.0309</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000173666Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110888"
      unitRef="pure">0.0030</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000173666Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110889"
      unitRef="pure">0.0167</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalBondIndex39_S000006912Member_S000006912Summary2Member"
      id="ixv-110890">Bloomberg Municipal Bond 
Index </oef:AverageAnnualReturnLabel>
    <oef:IndexNoDeductionForFeesExpensesTaxes
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-110891">(index reflects no deduction for fees, expenses or taxes)</oef:IndexNoDeductionForFeesExpensesTaxes>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalBondIndex39_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110892"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalBondIndex39_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110893"
      unitRef="pure">0.0080</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalBondIndex39_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-110894"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110895">Franklin 
Louisiana Tax-Free Income Fund</oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110896">Investment Goal</oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-22304">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;To provide investors with 
as high a level of income exempt from federal income taxes as is consistent with prudent investment management 
and the preservation of shareholders&#x2019; capital. The Fund also tries to provide a maximum level of 
income exempt from personal income taxes, if any, for resident shareholders of Louisiana.&lt;/p&gt;</oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110897">Fees and 
Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-22307">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;These tables describe the fees and expenses that you may pay if you buy, hold 
and sell shares of the Fund. &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;You may pay other fees (including on Class R6 and Advisor Class 
shares), such as brokerage commissions and other fees to financial intermediaries, which are not reflected 
in the tables and examples below.&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor. 
More information about these and other discounts is available from your financial professional and under 
&#x201c;Your Account&#x201d; on page 120 in the Fund&#x2019;s Prospectus and under &#x201c;Buying and Selling 
Shares&#x201d; on page 55 of the Fund&#x2019;s Statement of Additional Information. In addition, more information 
about sales charge discounts and waivers for purchases of shares through specific financial intermediaries 
is set forth in Appendix A &#x2013; &#x201c;Intermediary Sales Charge Discounts and Waivers&#x201d; to the 
Fund&#x2019;s prospectus.&lt;/span&gt;&lt;/p&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110898">You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor.</oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110899"
      unitRef="usd">100000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110900">Shareholder Fees</oef:ShareholderFeesCaption>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110901"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018765Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110902"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018766Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110903"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194357Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110904"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000173668Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110905"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="_1157_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018765Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="_1158_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018766Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110908"
      unitRef="pure">0.0100</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194357Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110909"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000173668Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110910"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:OperatingExpensesCaption
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110911">Annual 
Fund Operating Expenses (expenses that you pay each year as a percentage of the value 
of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110912"
      unitRef="pure">0.0055</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018765Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110913"
      unitRef="pure">0.0055</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018766Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110914"
      unitRef="pure">0.0055</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000194357Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110915"
      unitRef="pure">0.0055</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000173668Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110916"
      unitRef="pure">0.0055</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110917"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018765Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110918"
      unitRef="pure">0.0010</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018766Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110919"
      unitRef="pure">0.0065</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000194357Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110920"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000173668Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110921"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110922"
      unitRef="pure">0.0015</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018765Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110923"
      unitRef="pure">0.0015</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018766Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110924"
      unitRef="pure">0.0014</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194357Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110925"
      unitRef="pure">0.0011</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000173668Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110926"
      unitRef="pure">0.0015</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110927"
      unitRef="pure">0.0095</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018765Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110928"
      unitRef="pure">0.0080</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018766Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110929"
      unitRef="pure">0.0134</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194357Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110930"
      unitRef="pure">0.0066</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000173668Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110931"
      unitRef="pure">0.0070</oef:ExpensesOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="_1183_"
      unitRef="pure">-0.0005</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000018765Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="_1184_"
      unitRef="pure">-0.0005</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000018766Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="_1185_"
      unitRef="pure">-0.0004</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000194357Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="_1186_"
      unitRef="pure">-0.0004</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000173668Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="_1187_"
      unitRef="pure">-0.0005</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110937"
      unitRef="pure">0.0090</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018765Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110938"
      unitRef="pure">0.0075</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018766Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110939"
      unitRef="pure">0.0130</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194357Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110940"
      unitRef="pure">0.0062</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000173668Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110941"
      unitRef="pure">0.0065</oef:NetExpensesOverAssets>
    <oef:ExpenseExampleHeading
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110942">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-22634">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;This 
Example is intended to help you compare the cost of investing in the Fund with the cost of investing 
in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated 
and then redeem all of your shares at the end of the period. The Example also assumes that your investment 
has a 5% return each year and that the Fund's operating expenses remain the same. The Example reflects 
adjustments made to the Fund's operating expenses due to the fee waivers and/or expense reimbursements 
by management for the 1 Year numbers only. Although your actual costs may be higher or lower, based on 
these assumptions your costs would be:&lt;/p&gt;</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110943"
      unitRef="usd">463</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110944"
      unitRef="usd">661</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110945"
      unitRef="usd">875</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110946"
      unitRef="usd">1491</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018765Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110947"
      unitRef="usd">449</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018765Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110948"
      unitRef="usd">616</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018765Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110949"
      unitRef="usd">798</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018765Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110950"
      unitRef="usd">1324</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018766Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110951"
      unitRef="usd">232</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018766Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110952"
      unitRef="usd">421</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018766Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110953"
      unitRef="usd">731</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018766Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110954"
      unitRef="usd">1503</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000194357Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110955"
      unitRef="usd">63</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000194357Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110956"
      unitRef="usd">206</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000194357Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110957"
      unitRef="usd">363</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000194357Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110958"
      unitRef="usd">818</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000173668Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110959"
      unitRef="usd">66</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000173668Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110960"
      unitRef="usd">219</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000173668Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110961"
      unitRef="usd">385</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000173668Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110962"
      unitRef="usd">865</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionByYearCaption
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110963">If you do not sell your shares:</oef:ExpenseExampleNoRedemptionByYearCaption>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Context_20260228_20260228_C000018766Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110964"
      unitRef="usd">132</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Context_20260228_20260228_C000018766Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110965"
      unitRef="usd">421</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Context_20260228_20260228_C000018766Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110966"
      unitRef="usd">731</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Context_20260228_20260228_C000018766Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110967"
      unitRef="usd">1503</oef:ExpenseExampleNoRedemptionYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110968">Portfolio 
Turnover</oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-22820">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities 
(or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs 
and may result in higher taxes when Fund shares are held &lt;/p&gt;

&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;in 
a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, 
affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate 
was 13.78% of the average value of its portfolio.&lt;/p&gt;</oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110969"
      unitRef="pure">0.1378</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110970">Principal Investment Strategies</oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-22843">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Under 
normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax. In addition, under 
normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest 
free from the personal income taxes, if any, of Louisiana. &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the Fund tries to invest all of 
its assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in 
securities that pay interest that may be subject to the federal alternative minimum tax and in securities 
that pay interest subject to other federal or state income taxes.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund only buys municipal securities rated, 
at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized 
rating services (or unrated or short-term rated securities of comparable credit quality).&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund also may invest 
up to 35% of its total assets in municipal securities issued by U.S. territories.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the investment 
manager will search for investments across a large number of municipal securities that finance different 
types of projects, from time to time, based on economic conditions, the Fund may have significant positions 
in municipal securities that finance similar types of projects.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The investment manager selects securities 
that it believes will provide the best balance between risk and return within the Fund&#x2019;s range 
of allowable investments and typically invests with a long-term time horizon. This means it generally 
holds securities in the Fund&#x2019;s portfolio for income purposes, although the investment manager may 
sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, 
individual securities are considered for purchase or sale based on various factors and considerations, 
including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, 
opportunistic trading and tax loss harvesting opportunities. &lt;/p&gt;</oef:StrategyNarrativeTextBlock>
    <oef:StrategyPortfolioConcentration
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110971">Under 
normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax.</oef:StrategyPortfolioConcentration>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110972">Under 
normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax. In addition, under 
normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest 
free from the personal income taxes, if any, of Louisiana</fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110973">Under 
normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax. In addition, under 
normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest 
free from the personal income taxes, if any, of Louisiana</fnd:NmRule35d1TermDfnSmryTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_PrincipalRisks2_S000006916Summary2Member"
      id="ixv-22850">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:13.0pt; font-family:Arial; text-align:left; color:#004C97; font-weight:normal; text-decoration:none;"&gt;Principal Risks&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;You could lose money by 
investing in the Fund. Mutual fund shares are not deposits or obligations of, or guaranteed or endorsed 
by, any bank, and are not insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, 
or any other agency of the U.S. government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_RiskLoseMoneyMember_S000006916Summary2Member"
      id="ixv-110976">You could lose money by 
investing in the Fund.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_RiskNotInsuredMember_S000006916Summary2Member"
      id="ixv-110977">Mutual fund shares are not deposits or obligations of, or guaranteed or endorsed 
by, any bank, and are not insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, 
or any other agency of the U.S. government.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_InterestRate2_S000006916Summary2Member"
      id="ixv-22871">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Interest 
Rate:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 When interest rates rise, debt security prices generally fall. The opposite is also generally true: 
debt security prices rise when interest rates fall. Interest rate changes are influenced by a number 
of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, 
and supply of and demand for bonds. In general, securities with longer maturities or durations are more 
sensitive to interest rate changes. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_Credit2_S000006916Summary2Member"
      id="ixv-22875">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Credit:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  An issuer of debt securities may fail 
to make interest payments or repay principal when due, in whole or in part. Changes in an issuer's financial 
strength or in a security's or government's credit rating may affect a security's value. A change in 
the credit rating of a municipal bond insurer that insures securities in the Fund&#x2019;s portfolio may 
affect the value of the securities it insures, the Fund&#x2019;s share price and Fund performance. The 
Fund might also be adversely impacted by the inability of an insurer to meet its insurance obligations.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_Liquidity2_S000006916Summary2Member"
      id="ixv-22879">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The trading market for a particular security or type of security or other investments in which the Fund 
invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the 
Fund&#x2019;s ability to sell such securities or other investments when necessary to meet the Fund&#x2019;s 
liquidity needs, which may arise or increase in response to a specific economic event or because the 
investment manager wishes to purchase particular investments or believes that a higher level of liquidity 
would be advantageous. Reduced liquidity will also generally lower the value of such securities or other 
investments. Market prices for such securities or other investments may be relatively volatile.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_TaxLegislativeandPoliticalChanges2_S000006916Summary2Member"
      id="ixv-22883">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax 
Legislative and Political Changes:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The municipal securities market could be significantly affected 
by adverse political and legislative changes or litigation at the federal or state level. The value of 
municipal bonds is closely tied to the benefits of tax-exempt income to investors. Significant revisions 
of federal income tax laws or regulations revising income tax rates or the tax-exempt character of municipal 
bonds, or even proposed changes and deliberations on this topic by the federal government, could cause 
municipal bond prices to fall. For example, lower federal income tax rates would reduce certain relative 
advantages of owning municipal bonds, and lower state income tax rates could have similar effects. In 
addition, the application of corporate minimum tax rates to financial statement income may have the effect 
of reducing demand for municipal bonds among corporate investors, which may in turn impact municipal 
bond prices.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_Tax-ExemptSecurities2_S000006916Summary2Member"
      id="ixv-22887">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax-Exempt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Failure of a municipal security issuer 
to comply with applicable tax requirements may make income paid thereon taxable, resulting in a decline 
in the security&#x2019;s value. In addition, there could be changes in applicable tax laws or tax treatments 
that reduce or eliminate the current federal income tax exemption on municipal securities or otherwise 
adversely affect the current federal or state tax status of municipal securities.&lt;/span&gt;&lt;/p&gt;
</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_Market2_S000006916Summary2Member"
      id="ixv-22910">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Market: 
 &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The 
market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly 
or unpredictably. The market value of a security or other investment may be reduced by market activity 
or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all 
investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more 
buyers than sellers, prices tend to rise. In addition, the value of the Fund&#x2019;s investments may 
go up or down due to general market or other conditions that are not specifically related to a particular 
issuer, such as: real or perceived adverse economic changes, including widespread liquidity issues and 
defaults in one or more industries; changes in interest, inflation or exchange rates; unexpected natural 
and man-made world events, such as diseases or disasters; financial, political or social disruptions, 
including terrorism and war; and U.S. trade disputes or other disputes with specific countries that could 
result in additional tariffs, trade barriers and/or investment restrictions in certain securities in 
those countries. Any of these conditions can adversely affect the economic prospects of many companies, 
sectors, nations, regions and the market in general, in ways that cannot necessarily be foreseen.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Ongoing 
or threatened armed conflicts throughout the world have caused and could continue to cause significant 
market disruptions and volatility. The hostilities and sanctions resulting from those hostilities could 
have a significant impact on certain investments of the Fund as well as the Fund&#x2019;s performance 
and liquidity.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_Louisiana2_S000006916Summary2Member"
      id="ixv-22915">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Louisiana:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund invests predominantly in Louisiana 
municipal securities. Therefore, events in Louisiana are likely to affect the Fund&#x2019;s investments 
and its performance. These events may include economic or political policy changes, tax base erosion, 
unfunded pension and healthcare liabilities, constitutional limits on tax increases, budget deficits 
and other financial difficulties, and changes in the credit ratings assigned to municipal issuers of 
Louisiana. The same is true of events in other states or U.S. territories, to the extent that the Fund 
has exposure to any other state or territory at any given time.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_Focus2_S000006916Summary2Member"
      id="ixv-22919">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Focus:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund may invest more than 25% of its assets in municipal securities that finance similar types of 
projects, such as utilities, hospitals, higher education and transportation. A change that affects one 
project, such as proposed legislation on the financing of the project, a shortage of the materials needed 
for the project, or a declining need for the project, would likely affect all similar projects, thereby 
increasing market risk.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_Income2_S000006916Summary2Member"
      id="ixv-22923">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Income:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund's distributions to shareholders 
may decline when prevailing interest rates fall, when the Fund experiences defaults on debt securities 
it holds or when the Fund realizes a loss upon the sale of a debt security. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_Prepayment2_S000006916Summary2Member"
      id="ixv-22927">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Prepayment:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Prepayment risk occurs when a debt security can be repaid in whole or in part prior to the security's 
maturity and the Fund must reinvest the proceeds it &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;receives, 
during periods of declining interest rates, in securities that pay a lower rate of interest. Also, if 
a security has been purchased at a premium, the value of the premium would be lost in the event of prepayment. 
Prepayments generally increase when interest rates fall.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_Inflation2_S000006916Summary2Member"
      id="ixv-22951">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Inflation:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;  &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The market price of 
debt securities generally falls as inflation increases because the purchasing power of the future income 
and repaid principal is expected to be worth less when received by the Fund. Debt securities that pay 
a fixed rather than variable interest rate are especially vulnerable to inflation risk because variable-rate 
debt securities may be able to participate, over the long term, in rising interest rates which have historically 
corresponded with long-term inflationary trends.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_BondInsurers2_S000006916Summary2Member"
      id="ixv-22956">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Bond Insurers:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Market conditions or changes to ratings criteria could adversely impact the ratings of municipal bond 
insurance companies. Downgrades and withdrawal of ratings from municipal bond insurers have substantially 
limited the availability of insurance sought by municipal bond issuers thereby reducing the supply of 
insured municipal securities.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because of the consolidation among municipal bond insurers 
the Fund is subject to additional risks including the risk that credit risk may be concentrated among 
fewer insurers and the risk that events involving one or more municipal bond insurers could have a significant 
adverse effect on the value of the securities insured by an insurer and on the municipal markets as a 
whole.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_UnratedDebtSecurities2_S000006916Summary2Member"
      id="ixv-22961">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Unrated 
Debt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Certain unrated debt securities determined by the investment manager to be of 
comparable credit quality to rated securities which the Fund may purchase may pay a higher interest rate 
than such rated debt securities and be subject to a greater risk of illiquidity or price changes. Less 
public information and independent credit analysis are typically available about unrated securities or 
issuers, and therefore they may be subject to greater risk of default.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_Management2_S000006916Summary2Member"
      id="ixv-22965">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Management:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund is subject to management risk because it is an actively managed investment portfolio. The Fund's 
investment manager applies investment techniques and risk analyses in making investment decisions for 
the Fund, but there can be no guarantee that these decisions will produce the desired results.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_Cybersecurity2_S000006916Summary2Member"
      id="ixv-22969">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Cybersecurity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain 
access to Fund assets, Fund or customer data (including private shareholder information), or proprietary 
information, cause the Fund, the investment manager, and/or their service providers (including, but not 
limited to, Fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) 
to suffer data breaches, data corruption or loss of operational functionality or prevent Fund investors 
from purchasing, redeeming or exchanging shares or receiving distributions. The investment manager has 
limited ability to prevent or mitigate cybersecurity incidents affecting third party service &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;providers, 
and such third party service providers may have limited indemnification obligations to the Fund or the 
investment manager. Cybersecurity incidents may result in financial losses to the Fund and its shareholders, 
and substantial costs may be incurred in an effort to prevent or mitigate future cybersecurity incidents. 
Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value 
of these securities could decline if the issuers experience cybersecurity incidents.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because technology is 
frequently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a 
chance that some risks have not been identified or prepared for, or that an attack may not be detected, 
which puts limitations on the Fund's ability to plan for or respond to a cyber attack. Like other funds 
and business enterprises, the Fund, the investment manager, and their service providers are subject to 
the risk of cyber incidents occurring from time to time.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110978">Performance</oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-22995">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future. You can obtain updated performance information 
at www.franklintempleton.com or by calling (800) DIAL BEN/342-5236.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.&lt;/p&gt;</oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110979">The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance.</oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110980">The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110981">franklintempleton.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:PerformanceAvailabilityPhone
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110982">(800) DIAL BEN/342-5236</oef:PerformanceAvailabilityPhone>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110983">Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.</oef:BarChartDoesNotReflectSalesLoads>
    <oef:BarChartHeading
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110984">Class A Annual Total Returns</oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-23019">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:17.33%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:68%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.67%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Best Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2023, Q4&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;8.31%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Worst Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2022, Q1&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;-6.62%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="2" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:100%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; font-size:1pt;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.24%.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</oef:BarChartClosingTextBlock>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      id="ixv-110985">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      id="ixv-110986">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110987"
      unitRef="pure">0.0831</oef:BarChartHighestQuarterlyReturn>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      id="ixv-110988">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      id="ixv-110989">2022-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110990"
      unitRef="pure">-0.0662</oef:BarChartLowestQuarterlyReturn>
    <oef:YearToDateReturnLabel
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      id="ixv-110991">As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.24%.</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturnDate
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      id="ixv-110992">2026-03-31</oef:BarChartYearToDateReturnDate>
    <oef:BarChartYearToDateReturn
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110993"
      unitRef="pure">-0.0024</oef:BarChartYearToDateReturn>
    <oef:PerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-110994">Average Annual Total Returns (figures 
reflect sales charges) For periods ended December 31, 2025</oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      id="ixv-110995">Return before taxes</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110996"
      unitRef="pure">-0.0148</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110997"
      unitRef="pure">-0.0063</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-110998"
      unitRef="pure">0.0124</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205895Member_S000006916Member_S000006916Summary2Member"
      id="ixv-110999">Return after taxes on 
distributions</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-111000"
      unitRef="pure">-0.0150</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-111001"
      unitRef="pure">-0.0064</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-111002"
      unitRef="pure">0.0123</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205895Member_S000006916Member_S000006916Summary2Member"
      id="ixv-111003">Return after taxes on distributions and sale of Fund shares</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-111004"
      unitRef="pure">0.0029</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-111005"
      unitRef="pure">0.0008</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-111006"
      unitRef="pure">0.0158</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018765Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-111007"
      unitRef="pure">-0.0146</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018765Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-111008"
      unitRef="pure">-0.0048</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018765Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-111009"
      unitRef="pure">0.0133</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018766Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-111010"
      unitRef="pure">0.0081</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018766Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-111011"
      unitRef="pure">-0.0031</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018766Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-111012"
      unitRef="pure">0.0114</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000194357Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-111013"
      unitRef="pure">0.0254</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000194357Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-111014"
      unitRef="pure">0.0041</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20170801_20251231_C000194357Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="_1300_"
      unitRef="pure">0.0179</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000173668Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-111016"
      unitRef="pure">0.0261</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000173668Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-111017"
      unitRef="pure">0.0038</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000173668Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-111018"
      unitRef="pure">0.0183</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalBondIndex310_S000006916Member_S000006916Summary2Member"
      id="ixv-111019">Bloomberg Municipal Bond Index </oef:AverageAnnualReturnLabel>
    <oef:IndexNoDeductionForFeesExpensesTaxes
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-111020">(index reflects no deduction 
for fees, expenses or taxes)</oef:IndexNoDeductionForFeesExpensesTaxes>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalBondIndex310_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-111021"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalBondIndex310_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-111022"
      unitRef="pure">0.0080</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalBondIndex310_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-111023"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111024">Franklin 
Maryland Tax-Free Income Fund</oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111025">Investment Goal</oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-23399">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;To provide investors with 
as high a level of income exempt from federal income taxes as is consistent with prudent investment management 
and the preservation of shareholders&#x2019; capital. The Fund also tries to provide a maximum level of 
income exempt from personal income taxes, if any, for resident shareholders of Maryland.&lt;/p&gt;</oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111026">Fees and 
Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-23402">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;These tables describe the fees and expenses that you may pay if you buy, hold 
and sell shares of the Fund. &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;You may pay other fees (including on Class R6 and Advisor Class 
shares), such as brokerage commissions and other fees to financial intermediaries, which are not reflected 
in the tables and examples below.&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor. 
More information about these and other discounts is available from your financial professional and under 
&#x201c;Your Account&#x201d; on page 120 in the Fund&#x2019;s Prospectus and under &#x201c;Buying and Selling 
Shares&#x201d; on page 55 of the Fund&#x2019;s Statement of Additional Information. In addition, more information 
about sales charge discounts and waivers for purchases of shares through specific financial intermediaries 
is set forth in Appendix A &#x2013; &#x201c;Intermediary Sales Charge Discounts and Waivers&#x201d; to the 
Fund&#x2019;s prospectus.&lt;/span&gt;&lt;/p&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111027">You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor.</oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111028"
      unitRef="usd">100000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111029">Shareholder Fees</oef:ShareholderFeesCaption>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111030"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018767Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111031"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018768Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111032"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194358Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111033"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000079635Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111034"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="_1322_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018767Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="_1323_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018768Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111037"
      unitRef="pure">0.0100</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194358Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111038"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000079635Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111039"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:OperatingExpensesCaption
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111040">Annual 
Fund Operating Expenses (expenses that you pay each year as a percentage of the value 
of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111041"
      unitRef="pure">0.0053</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018767Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111042"
      unitRef="pure">0.0053</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018768Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111043"
      unitRef="pure">0.0053</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000194358Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111044"
      unitRef="pure">0.0053</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000079635Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111045"
      unitRef="pure">0.0053</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111046"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018767Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111047"
      unitRef="pure">0.0010</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018768Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111048"
      unitRef="pure">0.0065</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000194358Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111049"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000079635Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111050"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111051"
      unitRef="pure">0.0014</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018767Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111052"
      unitRef="pure">0.0014</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018768Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111053"
      unitRef="pure">0.0013</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194358Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111054"
      unitRef="pure">0.0007</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079635Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111055"
      unitRef="pure">0.0014</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111056"
      unitRef="pure">0.0092</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018767Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111057"
      unitRef="pure">0.0077</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018768Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111058"
      unitRef="pure">0.0131</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194358Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111059"
      unitRef="pure">0.0060</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079635Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111060"
      unitRef="pure">0.0067</oef:ExpensesOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="_1348_"
      unitRef="pure">-0.0002</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000018767Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="_1349_"
      unitRef="pure">-0.0002</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000018768Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="_1350_"
      unitRef="pure">-0.0001</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000194358Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="_1351_"
      unitRef="pure">0</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000079635Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="_1352_"
      unitRef="pure">-0.0002</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111066"
      unitRef="pure">0.0090</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018767Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111067"
      unitRef="pure">0.0075</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018768Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111068"
      unitRef="pure">0.0130</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194358Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111069"
      unitRef="pure">0.0060</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079635Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111070"
      unitRef="pure">0.0065</oef:NetExpensesOverAssets>
    <oef:ExpenseExampleHeading
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111071">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-23729">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;This 
Example is intended to help you compare the cost of investing in the Fund with the cost of investing 
in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated 
and then redeem all of your shares at the end of the period. The Example also assumes that your investment 
has a 5% return each year and that the Fund's operating expenses remain the same. The Example reflects 
adjustments made to the Fund's operating expenses due to the fee waivers and/or expense reimbursements 
by management for the 1 Year numbers only. Although your actual costs may be higher or lower, based on 
these assumptions your costs would be:&lt;/p&gt;</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111072"
      unitRef="usd">463</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111073"
      unitRef="usd">655</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111074"
      unitRef="usd">863</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111075"
      unitRef="usd">1462</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018767Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111076"
      unitRef="usd">449</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018767Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111077"
      unitRef="usd">610</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018767Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111078"
      unitRef="usd">785</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018767Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111079"
      unitRef="usd">1291</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018768Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111080"
      unitRef="usd">232</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018768Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111081"
      unitRef="usd">413</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018768Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111082"
      unitRef="usd">716</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018768Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111083"
      unitRef="usd">1470</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000194358Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111084"
      unitRef="usd">61</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000194358Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111085"
      unitRef="usd">192</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000194358Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111086"
      unitRef="usd">335</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000194358Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111087"
      unitRef="usd">750</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000079635Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111088"
      unitRef="usd">66</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000079635Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111089"
      unitRef="usd">212</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000079635Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111090"
      unitRef="usd">371</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000079635Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111091"
      unitRef="usd">832</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionByYearCaption
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111092">If you do not sell your shares:</oef:ExpenseExampleNoRedemptionByYearCaption>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Context_20260228_20260228_C000018768Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111093"
      unitRef="usd">132</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Context_20260228_20260228_C000018768Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111094"
      unitRef="usd">413</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Context_20260228_20260228_C000018768Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111095"
      unitRef="usd">716</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Context_20260228_20260228_C000018768Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111096"
      unitRef="usd">1470</oef:ExpenseExampleNoRedemptionYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111097">Portfolio 
Turnover</oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-23915">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities 
(or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs 
and may result in higher taxes when Fund shares are held &lt;/p&gt;

&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;in 
a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, 
affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate 
was 20.14% of the average value of its portfolio.&lt;/p&gt;</oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111098"
      unitRef="pure">0.2014</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111099">Principal Investment Strategies</oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-23938">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Under 
normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax. In addition, under 
normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest 
free from the personal income taxes, if any, of Maryland. &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the Fund tries to invest all of 
its assets in tax-free securities, it is possible that up to 20% of the Fund's total assets may be in 
securities that pay interest that may be subject to the federal alternative minimum tax and in securities 
that pay interest subject to other federal or state income taxes.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund only buys municipal securities rated, 
at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized 
rating services (or unrated or short-term rated securities of comparable credit quality).&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund also may invest 
up to 35% of its total assets in municipal securities issued by U.S. territories.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the investment 
manager will search for investments across a large number of municipal securities that finance different 
types of projects, from time to time, based on economic conditions, the Fund may have significant positions 
in municipal securities that finance similar types of projects.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The investment manager selects securities 
that it believes will provide the best balance between risk and return within the Fund&#x2019;s range 
of allowable investments and typically invests with a long-term time horizon. This means it generally 
holds securities in the Fund&#x2019;s portfolio for income purposes, although the investment manager may 
sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, 
individual securities are considered for purchase or sale based on various factors and considerations, 
including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, 
opportunistic trading and tax loss harvesting opportunities. &lt;/p&gt;</oef:StrategyNarrativeTextBlock>
    <oef:StrategyPortfolioConcentration
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111100">Under 
normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax.</oef:StrategyPortfolioConcentration>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111101">Under 
normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax. In addition, under 
normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest 
free from the personal income taxes, if any, of Maryland</fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111102">Under 
normal market conditions, the Fund invests at least 80% of its total assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax. In addition, under 
normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest 
free from the personal income taxes, if any, of Maryland</fnd:NmRule35d1TermDfnSmryTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_PrincipalRisks2_S000006917Summary2Member"
      id="ixv-23945">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:13.0pt; font-family:Arial; text-align:left; color:#004C97; font-weight:normal; text-decoration:none;"&gt;Principal Risks&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;You could lose money by 
investing in the Fund. Mutual fund shares are not deposits or obligations of, or guaranteed or endorsed 
by, any bank, and are not insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, 
or any other agency of the U.S. government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_RiskLoseMoneyMember_S000006917Summary2Member"
      id="ixv-111105">You could lose money by 
investing in the Fund.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_RiskNotInsuredMember_S000006917Summary2Member"
      id="ixv-111106">Mutual fund shares are not deposits or obligations of, or guaranteed or endorsed 
by, any bank, and are not insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, 
or any other agency of the U.S. government.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_InterestRate2_S000006917Summary2Member"
      id="ixv-23966">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Interest 
Rate:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 When interest rates rise, debt security prices generally fall. The opposite is also generally true: 
debt security prices rise when interest rates fall. Interest rate changes are influenced by a number 
of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, 
and supply of and demand for bonds. In general, securities with longer maturities or durations are more 
sensitive to interest rate changes. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_Credit2_S000006917Summary2Member"
      id="ixv-23970">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Credit:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  An issuer of debt securities may fail 
to make interest payments or repay principal when due, in whole or in part. Changes in an issuer's financial 
strength or in a security's or government's credit rating may affect a security's value. A change in 
the credit rating of a municipal bond insurer that insures securities in the Fund&#x2019;s portfolio may 
affect the value of the securities it insures, the Fund&#x2019;s share price and Fund performance. The 
Fund might also be adversely impacted by the inability of an insurer to meet its insurance obligations.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_Liquidity2_S000006917Summary2Member"
      id="ixv-23974">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The trading market for a particular security or type of security or other investments in which the Fund 
invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the 
Fund&#x2019;s ability to sell such securities or other investments when necessary to meet the Fund&#x2019;s 
liquidity needs, which may arise or increase in response to a specific economic event or because the 
investment manager wishes to purchase particular investments or believes that a higher level of liquidity 
would be advantageous. Reduced liquidity will also generally lower the value of such securities or other 
investments. Market prices for such securities or other investments may be relatively volatile.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_TaxLegislativeandPoliticalChanges2_S000006917Summary2Member"
      id="ixv-23978">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax 
Legislative and Political Changes:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The municipal securities market could be significantly affected 
by adverse political and legislative changes or litigation at the federal or state level. The value of 
municipal bonds is closely tied to the benefits of tax-exempt income to investors. Significant revisions 
of federal income tax laws or regulations revising income tax rates or the tax-exempt character of municipal 
bonds, or even proposed changes and deliberations on this topic by the federal government, could cause 
municipal bond prices to fall. For example, lower federal income tax rates would reduce certain relative 
advantages of owning municipal bonds, and lower state income tax rates could have similar effects. In 
addition, the application of corporate minimum tax rates to financial statement income may have the effect 
of reducing demand for municipal bonds among corporate investors, which may in turn impact municipal 
bond prices.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_Tax-ExemptSecurities2_S000006917Summary2Member"
      id="ixv-23982">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax-Exempt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Failure of a municipal security issuer 
to comply with applicable tax requirements may make income paid thereon taxable, resulting in a decline 
in the security&#x2019;s value. In addition, there could be changes in applicable tax laws or tax treatments 
that reduce or eliminate the current federal income tax exemption on municipal securities or otherwise 
adversely affect the current federal or state tax status of municipal securities.&lt;/span&gt;&lt;/p&gt;
</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_Market2_S000006917Summary2Member"
      id="ixv-24005">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Market: 
 &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The 
market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly 
or unpredictably. The market value of a security or other investment may be reduced by market activity 
or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all 
investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more 
buyers than sellers, prices tend to rise. In addition, the value of the Fund&#x2019;s investments may 
go up or down due to general market or other conditions that are not specifically related to a particular 
issuer, such as: real or perceived adverse economic changes, including widespread liquidity issues and 
defaults in one or more industries; changes in interest, inflation or exchange rates; unexpected natural 
and man-made world events, such as diseases or disasters; financial, political or social disruptions, 
including terrorism and war; and U.S. trade disputes or other disputes with specific countries that could 
result in additional tariffs, trade barriers and/or investment restrictions in certain securities in 
those countries. Any of these conditions can adversely affect the economic prospects of many companies, 
sectors, nations, regions and the market in general, in ways that cannot necessarily be foreseen.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Ongoing 
or threatened armed conflicts throughout the world have caused and could continue to cause significant 
market disruptions and volatility. The hostilities and sanctions resulting from those hostilities could 
have a significant impact on certain investments of the Fund as well as the Fund&#x2019;s performance 
and liquidity.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_Maryland2_S000006917Summary2Member"
      id="ixv-24010">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Maryland:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund invests predominantly in Maryland 
municipal securities. Therefore, events in Maryland are likely to affect the Fund&#x2019;s investments 
and its performance. These events may include economic or political policy changes, tax base erosion, 
unfunded pension and healthcare liabilities, constitutional limits on tax increases, budget deficits 
and other financial difficulties, and changes in the credit ratings assigned to municipal issuers of 
Maryland. The same is true of events in other states or U.S. territories, to the extent that the Fund 
has exposure to any other state or territory at any given time.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_Focus2_S000006917Summary2Member"
      id="ixv-24014">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Focus:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund may invest more than 25% of its assets in municipal securities that finance similar types of 
projects, such as utilities, hospitals, higher education and transportation. A change that affects one 
project, such as proposed legislation on the financing of the project, a shortage of the materials needed 
for the project, or a declining need for the project, would likely affect all similar projects, thereby 
increasing market risk.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_Income2_S000006917Summary2Member"
      id="ixv-24018">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Income:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund's distributions to shareholders 
may decline when prevailing interest rates fall, when the Fund experiences defaults on debt securities 
it holds or when the Fund realizes a loss upon the sale of a debt security. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_Prepayment2_S000006917Summary2Member"
      id="ixv-24022">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Prepayment:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Prepayment risk occurs when a debt security can be repaid in whole or in part prior to the security's 
maturity and the Fund must reinvest the proceeds it &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;receives, 
during periods of declining interest rates, in securities that pay a lower rate of interest. Also, if 
a security has been purchased at a premium, the value of the premium would be lost in the event of prepayment. 
Prepayments generally increase when interest rates fall.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_Inflation2_S000006917Summary2Member"
      id="ixv-24046">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Inflation:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;  &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The market price of 
debt securities generally falls as inflation increases because the purchasing power of the future income 
and repaid principal is expected to be worth less when received by the Fund. Debt securities that pay 
a fixed rather than variable interest rate are especially vulnerable to inflation risk because variable-rate 
debt securities may be able to participate, over the long term, in rising interest rates which have historically 
corresponded with long-term inflationary trends.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_BondInsurers2_S000006917Summary2Member"
      id="ixv-24051">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Bond Insurers:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Market conditions or changes to ratings criteria could adversely impact the ratings of municipal bond 
insurance companies. Downgrades and withdrawal of ratings from municipal bond insurers have substantially 
limited the availability of insurance sought by municipal bond issuers thereby reducing the supply of 
insured municipal securities.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because of the consolidation among municipal bond insurers 
the Fund is subject to additional risks including the risk that credit risk may be concentrated among 
fewer insurers and the risk that events involving one or more municipal bond insurers could have a significant 
adverse effect on the value of the securities insured by an insurer and on the municipal markets as a 
whole.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_UnratedDebtSecurities2_S000006917Summary2Member"
      id="ixv-24056">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Unrated 
Debt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Certain unrated debt securities determined by the investment manager to be of 
comparable credit quality to rated securities which the Fund may purchase may pay a higher interest rate 
than such rated debt securities and be subject to a greater risk of illiquidity or price changes. Less 
public information and independent credit analysis are typically available about unrated securities or 
issuers, and therefore they may be subject to greater risk of default.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_Management2_S000006917Summary2Member"
      id="ixv-24060">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Management:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund is subject to management risk because it is an actively managed investment portfolio. The Fund's 
investment manager applies investment techniques and risk analyses in making investment decisions for 
the Fund, but there can be no guarantee that these decisions will produce the desired results.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_Cybersecurity2_S000006917Summary2Member"
      id="ixv-24064">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Cybersecurity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain 
access to Fund assets, Fund or customer data (including private shareholder information), or proprietary 
information, cause the Fund, the investment manager, and/or their service providers (including, but not 
limited to, Fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) 
to suffer data breaches, data corruption or loss of operational functionality or prevent Fund investors 
from purchasing, redeeming or exchanging shares or receiving distributions. The investment manager has 
limited ability to prevent or mitigate cybersecurity incidents affecting third party service &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;providers, 
and such third party service providers may have limited indemnification obligations to the Fund or the 
investment manager. Cybersecurity incidents may result in financial losses to the Fund and its shareholders, 
and substantial costs may be incurred in an effort to prevent or mitigate future cybersecurity incidents. 
Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value 
of these securities could decline if the issuers experience cybersecurity incidents.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because technology is 
frequently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a 
chance that some risks have not been identified or prepared for, or that an attack may not be detected, 
which puts limitations on the Fund's ability to plan for or respond to a cyber attack. Like other funds 
and business enterprises, the Fund, the investment manager, and their service providers are subject to 
the risk of cyber incidents occurring from time to time.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111107">Performance</oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-24090">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future. You can obtain updated performance information 
at www.franklintempleton.com or by calling (800) DIAL BEN/342-5236.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.&lt;/p&gt;</oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111108">The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance.</oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111109">The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111110">franklintempleton.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:PerformanceAvailabilityPhone
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111111">(800) DIAL BEN/342-5236</oef:PerformanceAvailabilityPhone>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111112">Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.</oef:BarChartDoesNotReflectSalesLoads>
    <oef:BarChartHeading
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111113">Class A Annual Total Returns</oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-24114">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:17.33%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:68%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.67%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Best Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2023, Q4&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;7.71%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Worst Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2022, Q1&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;-6.25%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="2" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:100%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; font-size:1pt;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.09%.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</oef:BarChartClosingTextBlock>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      id="ixv-111114">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      id="ixv-111115">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111116"
      unitRef="pure">0.0771</oef:BarChartHighestQuarterlyReturn>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      id="ixv-111117">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      id="ixv-111118">2022-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111119"
      unitRef="pure">-0.0625</oef:BarChartLowestQuarterlyReturn>
    <oef:YearToDateReturnLabel
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      id="ixv-111120">As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.09%.</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturnDate
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      id="ixv-111121">2026-03-31</oef:BarChartYearToDateReturnDate>
    <oef:BarChartYearToDateReturn
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111122"
      unitRef="pure">-0.0009</oef:BarChartYearToDateReturn>
    <oef:PerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111123">Average Annual Total Returns (figures 
reflect sales charges) For periods ended December 31, 2025</oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      id="ixv-111124">Return before taxes</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111125"
      unitRef="pure">-0.0143</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111126"
      unitRef="pure">-0.0059</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111127"
      unitRef="pure">0.0116</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205896Member_S000006917Member_S000006917Summary2Member"
      id="ixv-111128">Return after taxes on 
distributions</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111129"
      unitRef="pure">-0.0144</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111130"
      unitRef="pure">-0.0060</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111131"
      unitRef="pure">0.0115</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205896Member_S000006917Member_S000006917Summary2Member"
      id="ixv-111132">Return after taxes on distributions and sale of Fund shares</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111133"
      unitRef="pure">0.0043</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111134"
      unitRef="pure">0.0017</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111135"
      unitRef="pure">0.0155</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018767Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111136"
      unitRef="pure">-0.0124</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018767Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111137"
      unitRef="pure">-0.0045</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018767Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111138"
      unitRef="pure">0.0127</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018768Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111139"
      unitRef="pure">0.0095</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018768Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111140"
      unitRef="pure">-0.0028</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018768Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111141"
      unitRef="pure">0.0107</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000194358Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111142"
      unitRef="pure">0.0271</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000194358Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111143"
      unitRef="pure">0.0047</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20170801_20251231_C000194358Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="_1465_"
      unitRef="pure">0.0172</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000079635Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111145"
      unitRef="pure">0.0266</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000079635Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111146"
      unitRef="pure">0.0042</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000079635Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111147"
      unitRef="pure">0.0175</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalBondIndex311_S000006917Member_S000006917Summary2Member"
      id="ixv-111148">Bloomberg Municipal Bond 
Index </oef:AverageAnnualReturnLabel>
    <oef:IndexNoDeductionForFeesExpensesTaxes
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-111149">(index reflects no deduction for fees, expenses or taxes)</oef:IndexNoDeductionForFeesExpensesTaxes>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalBondIndex311_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111150"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalBondIndex311_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111151"
      unitRef="pure">0.0080</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalBondIndex311_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-111152"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111153">Franklin 
Missouri Tax-Free Income Fund</oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111154">Investment Goal</oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-24494">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;To provide investors with 
as high a level of income exempt from federal income taxes as is consistent with prudent investment management 
and the preservation of shareholders&#x2019; capital. The Fund also tries to provide a maximum level of 
income exempt from personal income taxes, if any, for resident shareholders of Missouri.&lt;/p&gt;</oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111155">Fees and 
Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-24497">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;These tables describe the fees and expenses that you may pay if you buy, hold 
and sell shares of the Fund. &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;You may pay other fees (including on Class R6 and Advisor Class 
shares), such as brokerage commissions and other fees to financial intermediaries, which are not reflected 
in the tables and examples below.&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor. 
More information about these and other discounts is available from your financial professional and under 
&#x201c;Your Account&#x201d; on page 120 in the Fund&#x2019;s Prospectus and under &#x201c;Buying and Selling 
Shares&#x201d; on page 55 of the Fund&#x2019;s Statement of Additional Information. In addition, more information 
about sales charge discounts and waivers for purchases of shares through specific financial intermediaries 
is set forth in Appendix A &#x2013; &#x201c;Intermediary Sales Charge Discounts and Waivers&#x201d; to the 
Fund&#x2019;s prospectus.&lt;/span&gt;&lt;/p&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111156">You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor.</oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111157"
      unitRef="usd">100000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111158">Shareholder Fees</oef:ShareholderFeesCaption>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111159"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018776Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111160"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018777Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111161"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194362Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111162"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000079638Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111163"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="_1487_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018776Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="_1488_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018777Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111166"
      unitRef="pure">0.0100</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194362Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111167"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000079638Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111168"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:OperatingExpensesCaption
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111169">Annual 
Fund Operating Expenses (expenses that you pay each year as a percentage of the value 
of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111170"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018776Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111171"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018777Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111172"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000194362Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111173"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000079638Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111174"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111175"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018776Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111176"
      unitRef="pure">0.0010</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018777Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111177"
      unitRef="pure">0.0065</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000194362Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111178"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000079638Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111179"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111180"
      unitRef="pure">0.0010</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018776Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111181"
      unitRef="pure">0.0010</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018777Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111182"
      unitRef="pure">0.0009</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194362Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111183"
      unitRef="pure">0.0006</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079638Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111184"
      unitRef="pure">0.0010</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111185"
      unitRef="pure">0.0084</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018776Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111186"
      unitRef="pure">0.0069</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018777Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111187"
      unitRef="pure">0.0123</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194362Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111188"
      unitRef="pure">0.0055</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079638Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111189"
      unitRef="pure">0.0059</oef:ExpensesOverAssets>
    <oef:ExpenseExampleHeading
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111190">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-24773">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;This 
Example is intended to help you compare the cost of investing in the Fund with the cost of investing 
in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated 
and then redeem all of your shares at the end of the period. The Example also assumes that your investment 
has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual 
costs may be higher or lower, based on these assumptions your costs would be:&lt;/p&gt;</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111191"
      unitRef="usd">458</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111192"
      unitRef="usd">634</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111193"
      unitRef="usd">824</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111194"
      unitRef="usd">1373</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018776Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111195"
      unitRef="usd">443</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018776Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111196"
      unitRef="usd">588</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018776Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111197"
      unitRef="usd">745</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018776Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111198"
      unitRef="usd">1201</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018777Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111199"
      unitRef="usd">225</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018777Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111200"
      unitRef="usd">390</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018777Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111201"
      unitRef="usd">675</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018777Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111202"
      unitRef="usd">1379</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000194362Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111203"
      unitRef="usd">56</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000194362Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111204"
      unitRef="usd">176</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000194362Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111205"
      unitRef="usd">307</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000194362Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111206"
      unitRef="usd">689</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000079638Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111207"
      unitRef="usd">60</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000079638Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111208"
      unitRef="usd">189</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000079638Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111209"
      unitRef="usd">330</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000079638Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111210"
      unitRef="usd">739</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionByYearCaption
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111211">If you do not sell your shares:</oef:ExpenseExampleNoRedemptionByYearCaption>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Context_20260228_20260228_C000018777Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111212"
      unitRef="usd">125</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Context_20260228_20260228_C000018777Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111213"
      unitRef="usd">390</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Context_20260228_20260228_C000018777Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111214"
      unitRef="usd">675</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Context_20260228_20260228_C000018777Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111215"
      unitRef="usd">1379</oef:ExpenseExampleNoRedemptionYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111216">Portfolio 
Turnover</oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-24959">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities 
(or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs 
and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are 
not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During 
the most recent fiscal year, the Fund's portfolio turnover rate was 12.36% of the average value of its 
portfolio.&lt;/p&gt;</oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111217"
      unitRef="pure">0.1236</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111218">Principal Investment Strategies</oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-24962">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Missouri. &lt;/p&gt;
&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although 
the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the 
Fund's total assets may be in securities that pay interest that may be subject to the federal alternative 
minimum tax and in securities that pay interest subject to other federal or state income taxes.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories 
by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities 
of comparable credit quality).&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund also may invest up to 35% of its total assets in municipal securities 
issued by U.S. territories.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the investment manager will search for investments across a large number 
of municipal securities that finance different types of projects, from time to time, based on economic 
conditions, the Fund may have significant positions in municipal securities that finance similar types 
of projects.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
investment manager selects securities that it believes will provide the best balance between risk and 
return within the Fund&#x2019;s range of allowable investments and typically invests with a long-term 
time horizon. This means it generally holds securities in the Fund&#x2019;s portfolio for income purposes, 
although the investment manager may sell a security at any time if it believes it could help the Fund 
meet its goal. With a focus on income, individual securities are considered for purchase or sale based 
on various factors and considerations, including credit profile, risk, structure, pricing, portfolio 
impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities. 
&lt;/p&gt;</oef:StrategyNarrativeTextBlock>
    <oef:StrategyPortfolioConcentration
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111219">Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax.</oef:StrategyPortfolioConcentration>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111220">Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Missouri</fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111221">Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Missouri</fnd:NmRule35d1TermDfnSmryTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_PrincipalRisks2_S000006921Summary2Member"
      id="ixv-24988">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:13.0pt; font-family:Arial; text-align:left; color:#004C97; font-weight:normal; text-decoration:none;"&gt;Principal Risks&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;You could lose money by investing in the Fund. Mutual fund 
shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_RiskLoseMoneyMember_S000006921Summary2Member"
      id="ixv-111224">You could lose money by investing in the Fund.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_RiskNotInsuredMember_S000006921Summary2Member"
      id="ixv-111225">Mutual fund 
shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_InterestRate2_S000006921Summary2Member"
      id="ixv-24991">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Interest 
Rate:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 When interest rates rise, debt security prices generally fall. The opposite is also generally true: 
debt security prices rise when interest rates fall. Interest rate changes are influenced by a number 
of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, 
and supply of and demand for bonds. In general, securities with longer maturities or durations are more 
sensitive to interest rate changes. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_Credit2_S000006921Summary2Member"
      id="ixv-24995">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Credit:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  An issuer of debt securities may fail 
to make interest payments or repay principal when due, in whole or in part. Changes in an issuer's financial 
strength or in a security's or government's credit rating may affect a security's value. A change in 
the credit rating of a municipal bond insurer that insures securities in the Fund&#x2019;s portfolio may 
affect the value of the securities it insures, the Fund&#x2019;s share price and &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Fund 
performance. The Fund might also be adversely impacted by the inability of an insurer to meet its insurance 
obligations.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_Liquidity2_S000006921Summary2Member"
      id="ixv-25019">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The trading market for a particular security or type of security or other investments in which the Fund 
invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the 
Fund&#x2019;s ability to sell such securities or other investments when necessary to meet the Fund&#x2019;s 
liquidity needs, which may arise or increase in response to a specific economic event or because the 
investment manager wishes to purchase particular investments or believes that a higher level of liquidity 
would be advantageous. Reduced liquidity will also generally lower the value of such securities or other 
investments. Market prices for such securities or other investments may be relatively volatile.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_TaxLegislativeandPoliticalChanges2_S000006921Summary2Member"
      id="ixv-25023">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax 
Legislative and Political Changes:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The municipal securities market could be significantly affected 
by adverse political and legislative changes or litigation at the federal or state level. The value of 
municipal bonds is closely tied to the benefits of tax-exempt income to investors. Significant revisions 
of federal income tax laws or regulations revising income tax rates or the tax-exempt character of municipal 
bonds, or even proposed changes and deliberations on this topic by the federal government, could cause 
municipal bond prices to fall. For example, lower federal income tax rates would reduce certain relative 
advantages of owning municipal bonds, and lower state income tax rates could have similar effects. In 
addition, the application of corporate minimum tax rates to financial statement income may have the effect 
of reducing demand for municipal bonds among corporate investors, which may in turn impact municipal 
bond prices.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_Tax-ExemptSecurities2_S000006921Summary2Member"
      id="ixv-25027">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax-Exempt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Failure of a municipal security issuer 
to comply with applicable tax requirements may make income paid thereon taxable, resulting in a decline 
in the security&#x2019;s value. In addition, there could be changes in applicable tax laws or tax treatments 
that reduce or eliminate the current federal income tax exemption on municipal securities or otherwise 
adversely affect the current federal or state tax status of municipal securities.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_Market2_S000006921Summary2Member"
      id="ixv-25031">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Market: 
 &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The 
market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly 
or unpredictably. The market value of a security or other investment may be reduced by market activity 
or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all 
investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more 
buyers than sellers, prices tend to rise. In addition, the value of the Fund&#x2019;s investments may 
go up or down due to general market or other conditions that are not specifically related to a particular 
issuer, such as: real or perceived adverse economic changes, including widespread liquidity issues and 
defaults in one or more industries; changes in interest, inflation or exchange rates; unexpected natural 
and man-made world events, such as diseases or disasters; financial, political or social disruptions, 
including terrorism and war; and U.S. trade &lt;/span&gt;&lt;/p&gt;

&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;disputes 
or other disputes with specific countries that could result in additional tariffs, trade barriers and/or 
investment restrictions in certain securities in those countries. Any of these conditions can adversely 
affect the economic prospects of many companies, sectors, nations, regions and the market in general, 
in ways that cannot necessarily be foreseen.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Ongoing or threatened armed conflicts throughout the world 
have caused and could continue to cause significant market disruptions and volatility. The hostilities 
and sanctions resulting from those hostilities could have a significant impact on certain investments 
of the Fund as well as the Fund&#x2019;s performance and liquidity.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_Missouri2_S000006921Summary2Member"
      id="ixv-25056">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Missouri:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund invests predominantly in Missouri municipal securities. Therefore, events in Missouri are likely 
to affect the Fund&#x2019;s investments and its performance. These events may include economic or political 
policy changes, tax base erosion, unfunded pension and healthcare liabilities, constitutional limits 
on tax increases, budget deficits and other financial difficulties, and changes in the credit ratings 
assigned to municipal issuers of Missouri. The same is true of events in other states or U.S. territories, 
to the extent that the Fund has exposure to any other state or territory at any given time.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_Focus2_S000006921Summary2Member"
      id="ixv-25060">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Focus:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund may invest more than 25% of its assets in municipal securities that finance similar types of 
projects, such as utilities, hospitals, higher education and transportation. A change that affects one 
project, such as proposed legislation on the financing of the project, a shortage of the materials needed 
for the project, or a declining need for the project, would likely affect all similar projects, thereby 
increasing market risk.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_Income2_S000006921Summary2Member"
      id="ixv-25064">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Income:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund's distributions to shareholders 
may decline when prevailing interest rates fall, when the Fund experiences defaults on debt securities 
it holds or when the Fund realizes a loss upon the sale of a debt security. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_Prepayment2_S000006921Summary2Member"
      id="ixv-25068">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Prepayment:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Prepayment risk occurs when a debt security can be repaid in whole or in part prior to the security's 
maturity and the Fund must reinvest the proceeds it receives, during periods of declining interest rates, 
in securities that pay a lower rate of interest. Also, if a security has been purchased at a premium, 
the value of the premium would be lost in the event of prepayment. Prepayments generally increase when 
interest rates fall.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_Inflation2_S000006921Summary2Member"
      id="ixv-25072">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Inflation:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;  &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The market price of debt securities generally 
falls as inflation increases because the purchasing power of the future income and repaid principal is 
expected to be worth less when received by the Fund. Debt securities that pay a fixed rather than variable 
interest rate are especially vulnerable to inflation risk because variable-rate debt securities may be 
able to participate, over the long term, in rising interest rates which have historically corresponded 
with long-term inflationary trends.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_BondInsurers2_S000006921Summary2Member"
      id="ixv-25095">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Bond 
Insurers:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Market conditions or changes to ratings criteria could adversely impact the 
ratings of municipal bond insurance companies. Downgrades and withdrawal of ratings from municipal bond 
insurers have substantially limited the availability of insurance sought by municipal bond issuers thereby 
reducing the supply of insured municipal securities.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because of the consolidation among municipal 
bond insurers the Fund is subject to additional risks including the risk that credit risk may be concentrated 
among fewer insurers and the risk that events involving one or more municipal bond insurers could have 
a significant adverse effect on the value of the securities insured by an insurer and on the municipal 
markets as a whole.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_UnratedDebtSecurities2_S000006921Summary2Member"
      id="ixv-25100">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Unrated Debt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Certain unrated debt 
securities determined by the investment manager to be of comparable credit quality to rated securities 
which the Fund may purchase may pay a higher interest rate than such rated debt securities and be subject 
to a greater risk of illiquidity or price changes. Less public information and independent credit analysis 
are typically available about unrated securities or issuers, and therefore they may be subject to greater 
risk of default.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_Management2_S000006921Summary2Member"
      id="ixv-25104">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Management:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund is subject to management risk 
because it is an actively managed investment portfolio. The Fund's investment manager applies investment 
techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee 
that these decisions will produce the desired results.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_Cybersecurity2_S000006921Summary2Member"
      id="ixv-25108">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Cybersecurity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain 
access to Fund assets, Fund or customer data (including private shareholder information), or proprietary 
information, cause the Fund, the investment manager, and/or their service providers (including, but not 
limited to, Fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) 
to suffer data breaches, data corruption or loss of operational functionality or prevent Fund investors 
from purchasing, redeeming or exchanging shares or receiving distributions. The investment manager has 
limited ability to prevent or mitigate cybersecurity incidents affecting third party service providers, 
and such third party service providers may have limited indemnification obligations to the Fund or the 
investment manager. Cybersecurity incidents may result in financial losses to the Fund and its shareholders, 
and substantial costs may be incurred in an effort to prevent or mitigate future cybersecurity incidents. 
Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value 
of these securities could decline if the issuers experience cybersecurity incidents.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because technology is 
frequently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a 
chance that some risks have not been identified or prepared for, or that an attack may not be detected, 
which puts limitations on the Fund's ability to plan for or respond to a cyber attack. Like other &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;funds 
and business enterprises, the Fund, the investment manager, and their service providers are subject to 
the risk of cyber incidents occurring from time to time.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111226">Performance</oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-25134">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future. You can obtain updated performance information 
at www.franklintempleton.com or by calling (800) DIAL BEN/342-5236.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.&lt;/p&gt;</oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111227">The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance.</oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111228">The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111229">franklintempleton.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:PerformanceAvailabilityPhone
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111230">(800) DIAL BEN/342-5236</oef:PerformanceAvailabilityPhone>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111231">Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.</oef:BarChartDoesNotReflectSalesLoads>
    <oef:BarChartHeading
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111232">Class 
A Annual Total Returns</oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-25140">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:17.33%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:68%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.67%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Best Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2023, Q4&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;7.93%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Worst Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2022, Q1&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;-6.32%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="2" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:100%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; font-size:1pt;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was 0.09%.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
</oef:BarChartClosingTextBlock>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member"
      id="ixv-111233">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member"
      id="ixv-111234">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111235"
      unitRef="pure">0.0793</oef:BarChartHighestQuarterlyReturn>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member"
      id="ixv-111236">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member"
      id="ixv-111237">2022-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111238"
      unitRef="pure">-0.0632</oef:BarChartLowestQuarterlyReturn>
    <oef:YearToDateReturnLabel
      contextRef="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member"
      id="ixv-111239">As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was 0.09%.</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturnDate
      contextRef="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member"
      id="ixv-111240">2026-03-31</oef:BarChartYearToDateReturnDate>
    <oef:BarChartYearToDateReturn
      contextRef="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111241"
      unitRef="pure">0.0009</oef:BarChartYearToDateReturn>
    <oef:PerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111242">Average 
Annual Total Returns (figures reflect sales charges) For periods ended December 
31, 2025</oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_C000205900Member_S000006921Member_S000006921Summary2Member"
      id="ixv-111243">Return before taxes</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111244"
      unitRef="pure">-0.0066</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111245"
      unitRef="pure">-0.0064</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111246"
      unitRef="pure">0.0124</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205900Member_S000006921Member_S000006921Summary2Member"
      id="ixv-111247">Return after taxes on 
distributions</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111248"
      unitRef="pure">-0.0066</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111249"
      unitRef="pure">-0.0065</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111250"
      unitRef="pure">0.0123</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205900Member_S000006921Member_S000006921Summary2Member"
      id="ixv-111251">Return after taxes on distributions and sale of Fund shares</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111252"
      unitRef="pure">0.0096</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111253"
      unitRef="pure">0.0016</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111254"
      unitRef="pure">0.0162</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018776Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111255"
      unitRef="pure">-0.0054</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018776Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111256"
      unitRef="pure">-0.0050</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018776Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111257"
      unitRef="pure">0.0134</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018777Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111258"
      unitRef="pure">0.0177</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018777Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111259"
      unitRef="pure">-0.0032</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018777Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111260"
      unitRef="pure">0.0115</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000194362Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111261"
      unitRef="pure">0.0350</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000194362Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111262"
      unitRef="pure">0.0040</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20170801_20251231_C000194362Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="_1620_"
      unitRef="pure">0.0179</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000079638Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111264"
      unitRef="pure">0.0347</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000079638Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111265"
      unitRef="pure">0.0037</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000079638Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111266"
      unitRef="pure">0.0183</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalBondIndex312_S000006921Member_S000006921Summary2Member"
      id="ixv-111267">Bloomberg Municipal Bond 
Index </oef:AverageAnnualReturnLabel>
    <oef:IndexNoDeductionForFeesExpensesTaxes
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-111268">(index reflects no deduction for fees, expenses or taxes)</oef:IndexNoDeductionForFeesExpensesTaxes>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalBondIndex312_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111269"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalBondIndex312_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111270"
      unitRef="pure">0.0080</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalBondIndex312_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-111271"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111272">Franklin 
North Carolina Tax-Free Income Fund</oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111273">Investment Goal</oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-25519">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;To provide investors with 
as high a level of income exempt from federal income taxes as is consistent with prudent investment management 
and the preservation of shareholders&#x2019; capital. The Fund also tries to provide a maximum level of 
income exempt from personal income taxes, if any, for resident shareholders of North Carolina.&lt;/p&gt;</oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111274">Fees 
and Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-25522">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;These tables describe the fees and expenses that you may pay if you buy, hold 
and sell shares of the Fund. &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;You may pay other fees (including on Class R6 and Advisor Class 
shares), such as brokerage commissions and other fees to financial intermediaries, which are not reflected 
in the tables and examples below.&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor. 
More information about these and other discounts is available from your financial professional and under 
&#x201c;Your Account&#x201d; on page 120 in the Fund&#x2019;s Prospectus and under &#x201c;Buying and Selling 
Shares&#x201d; on page 55 of the Fund&#x2019;s Statement of Additional Information. In addition, more information 
about sales charge discounts and waivers for purchases of shares through specific financial intermediaries 
is set forth in Appendix A &#x2013; &#x201c;Intermediary Sales Charge Discounts and Waivers&#x201d; to the 
Fund&#x2019;s prospectus.&lt;/span&gt;&lt;/p&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111275">You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor.</oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111276"
      unitRef="usd">100000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111277">Shareholder Fees</oef:ShareholderFeesCaption>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111278"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018784Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111279"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018785Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111280"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194365Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111281"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000079639Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111282"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="_1642_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018784Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="_1643_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018785Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111285"
      unitRef="pure">0.0100</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194365Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111286"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000079639Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111287"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:OperatingExpensesCaption
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111288">Annual 
Fund Operating Expenses (expenses that you pay each year as a percentage of the value 
of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111289"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018784Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111290"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018785Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111291"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000194365Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111292"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000079639Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111293"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111294"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018784Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111295"
      unitRef="pure">0.0010</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018785Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111296"
      unitRef="pure">0.0065</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000194365Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111297"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000079639Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111298"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111299"
      unitRef="pure">0.0012</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018784Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111300"
      unitRef="pure">0.0012</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018785Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111301"
      unitRef="pure">0.0011</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194365Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111302"
      unitRef="pure">0.0007</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079639Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111303"
      unitRef="pure">0.0012</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111304"
      unitRef="pure">0.0086</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018784Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111305"
      unitRef="pure">0.0071</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018785Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111306"
      unitRef="pure">0.0125</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194365Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111307"
      unitRef="pure">0.0056</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079639Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111308"
      unitRef="pure">0.0061</oef:ExpensesOverAssets>
    <oef:ExpenseExampleHeading
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111309">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-25798">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;This 
Example is intended to help you compare the cost of investing in the Fund with the cost of investing 
in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated 
and then redeem all of your shares at the end of the period. The Example also assumes that your investment 
has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual 
costs may be higher or lower, based on these assumptions your costs would be:&lt;/p&gt;</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111310"
      unitRef="usd">459</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111311"
      unitRef="usd">639</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111312"
      unitRef="usd">833</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111313"
      unitRef="usd">1395</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018784Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111314"
      unitRef="usd">445</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018784Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111315"
      unitRef="usd">594</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018784Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111316"
      unitRef="usd">756</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018784Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111317"
      unitRef="usd">1226</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018785Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111318"
      unitRef="usd">227</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018785Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111319"
      unitRef="usd">396</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018785Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111320"
      unitRef="usd">686</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018785Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111321"
      unitRef="usd">1404</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000194365Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111322"
      unitRef="usd">57</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000194365Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111323"
      unitRef="usd">179</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000194365Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111324"
      unitRef="usd">312</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000194365Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111325"
      unitRef="usd">701</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000079639Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111326"
      unitRef="usd">62</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000079639Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111327"
      unitRef="usd">195</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000079639Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111328"
      unitRef="usd">340</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000079639Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111329"
      unitRef="usd">762</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionByYearCaption
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111330">If you do not sell your shares:</oef:ExpenseExampleNoRedemptionByYearCaption>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Context_20260228_20260228_C000018785Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111331"
      unitRef="usd">127</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Context_20260228_20260228_C000018785Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111332"
      unitRef="usd">396</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Context_20260228_20260228_C000018785Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111333"
      unitRef="usd">686</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Context_20260228_20260228_C000018785Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111334"
      unitRef="usd">1404</oef:ExpenseExampleNoRedemptionYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111335">Portfolio 
Turnover</oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-25984">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities 
(or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs 
and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are 
not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During 
the most recent fiscal year, the Fund's portfolio turnover rate was 16.41% of the average value of its 
portfolio.&lt;/p&gt;</oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111336"
      unitRef="pure">0.1641</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111337">Principal Investment Strategies</oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-25987">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of North Carolina. &lt;/p&gt;
&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although 
the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the 
Fund's total assets may be in securities that pay interest that may be subject to the federal alternative 
minimum tax and in securities that pay interest subject to other federal or state income taxes.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories 
by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities 
of comparable credit quality).&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund also may invest up to 35% of its total assets in municipal securities 
issued by U.S. territories.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the investment manager will search for investments across a large number 
of municipal securities that finance different types of projects, from time to time, based on economic 
conditions, the Fund may have significant positions in municipal securities that finance similar types 
of projects.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
investment manager selects securities that it believes will provide the best balance between risk and 
return within the Fund&#x2019;s range of allowable investments and typically invests with a long-term 
time horizon. This means it generally holds securities in the Fund&#x2019;s portfolio for income purposes, 
although the investment manager may sell a security at any time if it believes it could help the Fund 
meet its goal. With a focus on income, individual securities are considered for purchase or sale based 
on various factors and considerations, including credit profile, risk, structure, pricing, portfolio 
impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities. 
&lt;/p&gt;</oef:StrategyNarrativeTextBlock>
    <oef:StrategyPortfolioConcentration
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111338">Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax.</oef:StrategyPortfolioConcentration>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111339">Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of North Carolina</fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111340">Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of North Carolina</fnd:NmRule35d1TermDfnSmryTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_PrincipalRisks2_S000006924Summary2Member"
      id="ixv-26013">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:13.0pt; font-family:Arial; text-align:left; color:#004C97; font-weight:normal; text-decoration:none;"&gt;Principal Risks&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;You could lose money by investing in the Fund. Mutual fund 
shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_RiskLoseMoneyMember_S000006924Summary2Member"
      id="ixv-111343">You could lose money by investing in the Fund.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_RiskNotInsuredMember_S000006924Summary2Member"
      id="ixv-111344">Mutual fund 
shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_InterestRate2_S000006924Summary2Member"
      id="ixv-26016">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Interest 
Rate:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 When interest rates rise, debt security prices generally fall. The opposite is also generally true: 
debt security prices rise when interest rates fall. Interest rate changes are influenced by a number 
of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, 
and supply of and demand for bonds. In general, securities with longer maturities or durations are more 
sensitive to interest rate changes. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_Credit2_S000006924Summary2Member"
      id="ixv-26020">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Credit:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  An issuer of debt securities may fail 
to make interest payments or repay principal when due, in whole or in part. Changes in an issuer's financial 
strength or in a security's or government's credit rating may affect a security's value. A change in 
the credit rating of a municipal bond insurer that insures securities in the Fund&#x2019;s portfolio may 
affect the value of the securities it insures, the Fund&#x2019;s share price and &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Fund 
performance. The Fund might also be adversely impacted by the inability of an insurer to meet its insurance 
obligations.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_Liquidity2_S000006924Summary2Member"
      id="ixv-26044">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The trading market for a particular security or type of security or other investments in which the Fund 
invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the 
Fund&#x2019;s ability to sell such securities or other investments when necessary to meet the Fund&#x2019;s 
liquidity needs, which may arise or increase in response to a specific economic event or because the 
investment manager wishes to purchase particular investments or believes that a higher level of liquidity 
would be advantageous. Reduced liquidity will also generally lower the value of such securities or other 
investments. Market prices for such securities or other investments may be relatively volatile.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_TaxLegislativeandPoliticalChanges2_S000006924Summary2Member"
      id="ixv-26048">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax 
Legislative and Political Changes:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The municipal securities market could be significantly affected 
by adverse political and legislative changes or litigation at the federal or state level. The value of 
municipal bonds is closely tied to the benefits of tax-exempt income to investors. Significant revisions 
of federal income tax laws or regulations revising income tax rates or the tax-exempt character of municipal 
bonds, or even proposed changes and deliberations on this topic by the federal government, could cause 
municipal bond prices to fall. For example, lower federal income tax rates would reduce certain relative 
advantages of owning municipal bonds, and lower state income tax rates could have similar effects. In 
addition, the application of corporate minimum tax rates to financial statement income may have the effect 
of reducing demand for municipal bonds among corporate investors, which may in turn impact municipal 
bond prices.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_Tax-ExemptSecurities2_S000006924Summary2Member"
      id="ixv-26052">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax-Exempt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Failure of a municipal security issuer 
to comply with applicable tax requirements may make income paid thereon taxable, resulting in a decline 
in the security&#x2019;s value. In addition, there could be changes in applicable tax laws or tax treatments 
that reduce or eliminate the current federal income tax exemption on municipal securities or otherwise 
adversely affect the current federal or state tax status of municipal securities.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_Market2_S000006924Summary2Member"
      id="ixv-26056">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Market: 
 &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The 
market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly 
or unpredictably. The market value of a security or other investment may be reduced by market activity 
or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all 
investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more 
buyers than sellers, prices tend to rise. In addition, the value of the Fund&#x2019;s investments may 
go up or down due to general market or other conditions that are not specifically related to a particular 
issuer, such as: real or perceived adverse economic changes, including widespread liquidity issues and 
defaults in one or more industries; changes in interest, inflation or exchange rates; unexpected natural 
and man-made world events, such as diseases or disasters; financial, political or social disruptions, 
including terrorism and war; and U.S. trade &lt;/span&gt;&lt;/p&gt;

&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;disputes 
or other disputes with specific countries that could result in additional tariffs, trade barriers and/or 
investment restrictions in certain securities in those countries. Any of these conditions can adversely 
affect the economic prospects of many companies, sectors, nations, regions and the market in general, 
in ways that cannot necessarily be foreseen.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Ongoing or threatened armed conflicts throughout the world 
have caused and could continue to cause significant market disruptions and volatility. The hostilities 
and sanctions resulting from those hostilities could have a significant impact on certain investments 
of the Fund as well as the Fund&#x2019;s performance and liquidity.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_NorthCarolina2_S000006924Summary2Member"
      id="ixv-26081">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;North Carolina:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund invests predominantly in North Carolina municipal securities. Therefore, events in North Carolina 
are likely to affect the Fund&#x2019;s investments and its performance. These events may include economic 
or political policy changes, tax base erosion, unfunded pension and healthcare liabilities, constitutional 
limits on tax increases, budget deficits and other financial difficulties, and changes in the credit 
ratings assigned to municipal issuers of North Carolina. The same is true of events in other states or 
U.S. territories, to the extent that the Fund has exposure to any other state or territory at any given 
time.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_Focus2_S000006924Summary2Member"
      id="ixv-26085">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Focus:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund may invest more than 25% of its assets in municipal securities that finance similar types of 
projects, such as utilities, hospitals, higher education and transportation. A change that affects one 
project, such as proposed legislation on the financing of the project, a shortage of the materials needed 
for the project, or a declining need for the project, would likely affect all similar projects, thereby 
increasing market risk.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_Income2_S000006924Summary2Member"
      id="ixv-26089">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Income:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund's distributions to shareholders 
may decline when prevailing interest rates fall, when the Fund experiences defaults on debt securities 
it holds or when the Fund realizes a loss upon the sale of a debt security. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_Prepayment2_S000006924Summary2Member"
      id="ixv-26093">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Prepayment:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Prepayment risk occurs when a debt security can be repaid in whole or in part prior to the security's 
maturity and the Fund must reinvest the proceeds it receives, during periods of declining interest rates, 
in securities that pay a lower rate of interest. Also, if a security has been purchased at a premium, 
the value of the premium would be lost in the event of prepayment. Prepayments generally increase when 
interest rates fall.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_Inflation2_S000006924Summary2Member"
      id="ixv-26097">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Inflation:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;  &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The market price of debt securities generally 
falls as inflation increases because the purchasing power of the future income and repaid principal is 
expected to be worth less when received by the Fund. Debt securities that pay a fixed rather than variable 
interest rate are especially vulnerable to inflation risk because variable-rate debt securities may be 
able to participate, over the long term, in rising interest rates which have historically corresponded 
with long-term inflationary trends.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_BondInsurers2_S000006924Summary2Member"
      id="ixv-26120">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Bond 
Insurers:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Market conditions or changes to ratings criteria could adversely impact the 
ratings of municipal bond insurance companies. Downgrades and withdrawal of ratings from municipal bond 
insurers have substantially limited the availability of insurance sought by municipal bond issuers thereby 
reducing the supply of insured municipal securities.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because of the consolidation among municipal 
bond insurers the Fund is subject to additional risks including the risk that credit risk may be concentrated 
among fewer insurers and the risk that events involving one or more municipal bond insurers could have 
a significant adverse effect on the value of the securities insured by an insurer and on the municipal 
markets as a whole.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_UnratedDebtSecurities2_S000006924Summary2Member"
      id="ixv-26125">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Unrated Debt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Certain unrated debt 
securities determined by the investment manager to be of comparable credit quality to rated securities 
which the Fund may purchase may pay a higher interest rate than such rated debt securities and be subject 
to a greater risk of illiquidity or price changes. Less public information and independent credit analysis 
are typically available about unrated securities or issuers, and therefore they may be subject to greater 
risk of default.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_Management2_S000006924Summary2Member"
      id="ixv-26129">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Management:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund is subject to management risk 
because it is an actively managed investment portfolio. The Fund's investment manager applies investment 
techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee 
that these decisions will produce the desired results.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_Cybersecurity2_S000006924Summary2Member"
      id="ixv-26133">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Cybersecurity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain 
access to Fund assets, Fund or customer data (including private shareholder information), or proprietary 
information, cause the Fund, the investment manager, and/or their service providers (including, but not 
limited to, Fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) 
to suffer data breaches, data corruption or loss of operational functionality or prevent Fund investors 
from purchasing, redeeming or exchanging shares or receiving distributions. The investment manager has 
limited ability to prevent or mitigate cybersecurity incidents affecting third party service providers, 
and such third party service providers may have limited indemnification obligations to the Fund or the 
investment manager. Cybersecurity incidents may result in financial losses to the Fund and its shareholders, 
and substantial costs may be incurred in an effort to prevent or mitigate future cybersecurity incidents. 
Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value 
of these securities could decline if the issuers experience cybersecurity incidents.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because technology is 
frequently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a 
chance that some risks have not been identified or prepared for, or that an attack may not be detected, 
which puts limitations on the Fund's ability to plan for or respond to a cyber attack. Like other &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;funds 
and business enterprises, the Fund, the investment manager, and their service providers are subject to 
the risk of cyber incidents occurring from time to time.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111345">Performance</oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-26159">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future. You can obtain updated performance information 
at www.franklintempleton.com or by calling (800) DIAL BEN/342-5236.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.&lt;/p&gt;</oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111346">The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance.</oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111347">The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111348">franklintempleton.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:PerformanceAvailabilityPhone
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111349">(800) DIAL BEN/342-5236</oef:PerformanceAvailabilityPhone>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111350">Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.</oef:BarChartDoesNotReflectSalesLoads>
    <oef:BarChartHeading
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111351">Class 
A Annual Total Returns</oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-26165">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:17.33%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:68%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.67%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Best Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2023, Q4&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;7.73%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Worst Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2022, Q1&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;-6.64%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="2" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:100%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; font-size:1pt;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.13%.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
</oef:BarChartClosingTextBlock>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member"
      id="ixv-111352">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member"
      id="ixv-111353">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111354"
      unitRef="pure">0.0773</oef:BarChartHighestQuarterlyReturn>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member"
      id="ixv-111355">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member"
      id="ixv-111356">2022-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111357"
      unitRef="pure">-0.0664</oef:BarChartLowestQuarterlyReturn>
    <oef:YearToDateReturnLabel
      contextRef="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member"
      id="ixv-111358">As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.13%.</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturnDate
      contextRef="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member"
      id="ixv-111359">2026-03-31</oef:BarChartYearToDateReturnDate>
    <oef:BarChartYearToDateReturn
      contextRef="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111360"
      unitRef="pure">-0.0013</oef:BarChartYearToDateReturn>
    <oef:PerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111361">Average 
Annual Total Returns (figures reflect sales charges) For periods ended December 
31, 2025</oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_C000205903Member_S000006924Member_S000006924Summary2Member"
      id="ixv-111362">Return before taxes</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111363"
      unitRef="pure">-0.0059</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111364"
      unitRef="pure">-0.0070</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111365"
      unitRef="pure">0.0104</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205903Member_S000006924Member_S000006924Summary2Member"
      id="ixv-111366">Return after taxes on 
distributions</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111367"
      unitRef="pure">-0.0061</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111368"
      unitRef="pure">-0.0071</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111369"
      unitRef="pure">0.0104</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205903Member_S000006924Member_S000006924Summary2Member"
      id="ixv-111370">Return after taxes on distributions and sale of Fund shares</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111371"
      unitRef="pure">0.0075</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111372"
      unitRef="pure">-0.0001</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111373"
      unitRef="pure">0.0139</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018784Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111374"
      unitRef="pure">-0.0037</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018784Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111375"
      unitRef="pure">-0.0053</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018784Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111376"
      unitRef="pure">0.0116</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018785Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111377"
      unitRef="pure">0.0181</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018785Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111378"
      unitRef="pure">-0.0038</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018785Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111379"
      unitRef="pure">0.0095</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000194365Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111380"
      unitRef="pure">0.0369</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000194365Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111381"
      unitRef="pure">0.0037</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20170801_20251231_C000194365Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="_1775_"
      unitRef="pure">0.0165</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000079639Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111383"
      unitRef="pure">0.0354</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000079639Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111384"
      unitRef="pure">0.0031</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000079639Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111385"
      unitRef="pure">0.0164</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalBondIndex313_S000006924Member_S000006924Summary2Member"
      id="ixv-111386">Bloomberg Municipal Bond Index </oef:AverageAnnualReturnLabel>
    <oef:IndexNoDeductionForFeesExpensesTaxes
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-111387">(index reflects no deduction 
for fees, expenses or taxes)</oef:IndexNoDeductionForFeesExpensesTaxes>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalBondIndex313_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111388"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalBondIndex313_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111389"
      unitRef="pure">0.0080</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalBondIndex313_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-111390"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111391">Franklin 
Virginia Tax-Free Income Fund</oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111392">Investment Goal</oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-26544">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;To provide investors with 
as high a level of income exempt from federal income taxes as is consistent with prudent investment management 
and the preservation of shareholders&#x2019; capital. The Fund also tries to provide a maximum level of 
income exempt from personal income taxes, if any, for resident shareholders of Virginia.&lt;/p&gt;</oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111393">Fees and 
Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-26547">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;These tables describe the fees and expenses that you may pay if you buy, hold 
and sell shares of the Fund. &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;You may pay other fees (including on Class R6 and Advisor Class 
shares), such as brokerage commissions and other fees to financial intermediaries, which are not reflected 
in the tables and examples below.&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor. 
More information about these and other discounts is available from your financial professional and under 
&#x201c;Your Account&#x201d; on page 120 in the Fund&#x2019;s Prospectus and under &#x201c;Buying and Selling 
Shares&#x201d; on page 55 of the Fund&#x2019;s Statement of Additional Information. In addition, more information 
about sales charge discounts and waivers for purchases of shares through specific financial intermediaries 
is set forth in Appendix A &#x2013; &#x201c;Intermediary Sales Charge Discounts and Waivers&#x201d; to the 
Fund&#x2019;s prospectus.&lt;/span&gt;&lt;/p&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111394">You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor.</oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111395"
      unitRef="usd">100000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111396">Shareholder Fees</oef:ShareholderFeesCaption>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111397"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018794Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111398"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018795Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111399"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194369Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111400"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000079642Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111401"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="_1797_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018794Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="_1798_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018795Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111404"
      unitRef="pure">0.0100</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194369Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111405"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000079642Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111406"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:OperatingExpensesCaption
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111407">Annual 
Fund Operating Expenses (expenses that you pay each year as a percentage of the value 
of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111408"
      unitRef="pure">0.0051</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018794Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111409"
      unitRef="pure">0.0051</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018795Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111410"
      unitRef="pure">0.0051</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000194369Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111411"
      unitRef="pure">0.0051</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000079642Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111412"
      unitRef="pure">0.0051</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111413"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018794Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111414"
      unitRef="pure">0.0010</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018795Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111415"
      unitRef="pure">0.0065</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000194369Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111416"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000079642Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111417"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111418"
      unitRef="pure">0.0013</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018794Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111419"
      unitRef="pure">0.0013</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018795Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111420"
      unitRef="pure">0.0012</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194369Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111421"
      unitRef="pure">0.0006</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079642Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111422"
      unitRef="pure">0.0013</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111423"
      unitRef="pure">0.0089</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018794Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111424"
      unitRef="pure">0.0074</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018795Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111425"
      unitRef="pure">0.0128</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194369Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111426"
      unitRef="pure">0.0057</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079642Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111427"
      unitRef="pure">0.0064</oef:ExpensesOverAssets>
    <oef:ExpenseExampleHeading
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111428">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-26823">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;This 
Example is intended to help you compare the cost of investing in the Fund with the cost of investing 
in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated 
and then redeem all of your shares at the end of the period. The Example also assumes that your investment 
has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual 
costs may be higher or lower, based on these assumptions your costs would be:&lt;/p&gt;</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111429"
      unitRef="usd">462</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111430"
      unitRef="usd">648</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111431"
      unitRef="usd">850</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111432"
      unitRef="usd">1431</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018794Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111433"
      unitRef="usd">448</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018794Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111434"
      unitRef="usd">603</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018794Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111435"
      unitRef="usd">771</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018794Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111436"
      unitRef="usd">1259</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018795Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111437"
      unitRef="usd">230</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018795Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111438"
      unitRef="usd">405</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018795Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111439"
      unitRef="usd">701</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018795Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111440"
      unitRef="usd">1437</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000194369Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111441"
      unitRef="usd">58</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000194369Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111442"
      unitRef="usd">183</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000194369Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111443"
      unitRef="usd">318</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000194369Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111444"
      unitRef="usd">713</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000079642Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111445"
      unitRef="usd">65</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000079642Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111446"
      unitRef="usd">204</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000079642Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111447"
      unitRef="usd">356</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000079642Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111448"
      unitRef="usd">797</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionByYearCaption
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111449">If you do not sell your shares:</oef:ExpenseExampleNoRedemptionByYearCaption>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Context_20260228_20260228_C000018795Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111450"
      unitRef="usd">130</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Context_20260228_20260228_C000018795Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111451"
      unitRef="usd">405</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Context_20260228_20260228_C000018795Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111452"
      unitRef="usd">701</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Context_20260228_20260228_C000018795Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111453"
      unitRef="usd">1437</oef:ExpenseExampleNoRedemptionYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111454">Portfolio 
Turnover</oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-27009">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities 
(or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs 
and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are 
not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During 
the most recent fiscal year, the Fund's portfolio turnover rate was 15.57% of the average value of its 
portfolio.&lt;/p&gt;</oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111455"
      unitRef="pure">0.1557</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111456">Principal Investment Strategies</oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-27012">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Virginia. &lt;/p&gt;
&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although 
the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the 
Fund's total assets may be in securities that pay interest that may be subject to the federal alternative 
minimum tax and in securities that pay interest subject to other federal or state income taxes.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories 
by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities 
of comparable credit quality).&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund also may invest up to 35% of its total assets in municipal securities 
issued by U.S. territories.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the investment manager will search for investments across a large number 
of municipal securities that finance different types of projects, from time to time, based on economic 
conditions, the Fund may have significant positions in municipal securities that finance similar types 
of projects.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
investment manager selects securities that it believes will provide the best balance between risk and 
return within the Fund&#x2019;s range of allowable investments and typically invests with a long-term 
time horizon. This means it generally holds securities in the Fund&#x2019;s portfolio for income purposes, 
although the investment manager may sell a security at any time if it believes it could help the Fund 
meet its goal. With a focus on income, individual securities are considered for purchase or sale based 
on various factors and considerations, including credit profile, risk, structure, pricing, portfolio 
impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities. 
&lt;/p&gt;</oef:StrategyNarrativeTextBlock>
    <oef:StrategyPortfolioConcentration
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111457">Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax.</oef:StrategyPortfolioConcentration>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111458">Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Virginia</fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111459">Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Virginia</fnd:NmRule35d1TermDfnSmryTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_PrincipalRisks2_S000006928Summary2Member"
      id="ixv-27038">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:13.0pt; font-family:Arial; text-align:left; color:#004C97; font-weight:normal; text-decoration:none;"&gt;Principal Risks&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;You could lose money by investing in the Fund. Mutual fund 
shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_RiskLoseMoneyMember_S000006928Summary2Member"
      id="ixv-111462">You could lose money by investing in the Fund.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_RiskNotInsuredMember_S000006928Summary2Member"
      id="ixv-111463">Mutual fund 
shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_InterestRate2_S000006928Summary2Member"
      id="ixv-27041">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Interest 
Rate:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 When interest rates rise, debt security prices generally fall. The opposite is also generally true: 
debt security prices rise when interest rates fall. Interest rate changes are influenced by a number 
of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, 
and supply of and demand for bonds. In general, securities with longer maturities or durations are more 
sensitive to interest rate changes. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_Credit2_S000006928Summary2Member"
      id="ixv-27045">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Credit:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  An issuer of debt securities may fail 
to make interest payments or repay principal when due, in whole or in part. Changes in an issuer's financial 
strength or in a security's or government's credit rating may affect a security's value. A change in 
the credit rating of a municipal bond insurer that insures securities in the Fund&#x2019;s portfolio may 
affect the value of the securities it insures, the Fund&#x2019;s share price and &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Fund 
performance. The Fund might also be adversely impacted by the inability of an insurer to meet its insurance 
obligations.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_Liquidity2_S000006928Summary2Member"
      id="ixv-27069">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The trading market for a particular security or type of security or other investments in which the Fund 
invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the 
Fund&#x2019;s ability to sell such securities or other investments when necessary to meet the Fund&#x2019;s 
liquidity needs, which may arise or increase in response to a specific economic event or because the 
investment manager wishes to purchase particular investments or believes that a higher level of liquidity 
would be advantageous. Reduced liquidity will also generally lower the value of such securities or other 
investments. Market prices for such securities or other investments may be relatively volatile.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_TaxLegislativeandPoliticalChanges2_S000006928Summary2Member"
      id="ixv-27073">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax 
Legislative and Political Changes:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The municipal securities market could be significantly affected 
by adverse political and legislative changes or litigation at the federal or state level. The value of 
municipal bonds is closely tied to the benefits of tax-exempt income to investors. Significant revisions 
of federal income tax laws or regulations revising income tax rates or the tax-exempt character of municipal 
bonds, or even proposed changes and deliberations on this topic by the federal government, could cause 
municipal bond prices to fall. For example, lower federal income tax rates would reduce certain relative 
advantages of owning municipal bonds, and lower state income tax rates could have similar effects. In 
addition, the application of corporate minimum tax rates to financial statement income may have the effect 
of reducing demand for municipal bonds among corporate investors, which may in turn impact municipal 
bond prices.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_Tax-ExemptSecurities2_S000006928Summary2Member"
      id="ixv-27077">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax-Exempt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Failure of a municipal security issuer 
to comply with applicable tax requirements may make income paid thereon taxable, resulting in a decline 
in the security&#x2019;s value. In addition, there could be changes in applicable tax laws or tax treatments 
that reduce or eliminate the current federal income tax exemption on municipal securities or otherwise 
adversely affect the current federal or state tax status of municipal securities.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_Market2_S000006928Summary2Member"
      id="ixv-27081">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Market: 
 &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The 
market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly 
or unpredictably. The market value of a security or other investment may be reduced by market activity 
or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all 
investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more 
buyers than sellers, prices tend to rise. In addition, the value of the Fund&#x2019;s investments may 
go up or down due to general market or other conditions that are not specifically related to a particular 
issuer, such as: real or perceived adverse economic changes, including widespread liquidity issues and 
defaults in one or more industries; changes in interest, inflation or exchange rates; unexpected natural 
and man-made world events, such as diseases or disasters; financial, political or social disruptions, 
including terrorism and war; and U.S. trade &lt;/span&gt;&lt;/p&gt;

&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;disputes 
or other disputes with specific countries that could result in additional tariffs, trade barriers and/or 
investment restrictions in certain securities in those countries. Any of these conditions can adversely 
affect the economic prospects of many companies, sectors, nations, regions and the market in general, 
in ways that cannot necessarily be foreseen.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Ongoing or threatened armed conflicts throughout the world 
have caused and could continue to cause significant market disruptions and volatility. The hostilities 
and sanctions resulting from those hostilities could have a significant impact on certain investments 
of the Fund as well as the Fund&#x2019;s performance and liquidity.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_Virginia2_S000006928Summary2Member"
      id="ixv-27106">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Virginia:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund invests predominantly in Virginia municipal securities. Therefore, events in Virginia are likely 
to affect the Fund&#x2019;s investments and its performance. These events may include economic or political 
policy changes, tax base erosion, unfunded pension and healthcare liabilities, constitutional limits 
on tax increases, budget deficits and other financial difficulties, and changes in the credit ratings 
assigned to municipal issuers of Virginia. The same is true of events in other states or U.S. territories, 
to the extent that the Fund has exposure to any other state or territory at any given time.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_Focus2_S000006928Summary2Member"
      id="ixv-27110">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Focus:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund may invest more than 25% of its assets in municipal securities that finance similar types of 
projects, such as utilities, hospitals, higher education and transportation. A change that affects one 
project, such as proposed legislation on the financing of the project, a shortage of the materials needed 
for the project, or a declining need for the project, would likely affect all similar projects, thereby 
increasing market risk.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_Income2_S000006928Summary2Member"
      id="ixv-27114">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Income:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund's distributions to shareholders 
may decline when prevailing interest rates fall, when the Fund experiences defaults on debt securities 
it holds or when the Fund realizes a loss upon the sale of a debt security. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_Prepayment2_S000006928Summary2Member"
      id="ixv-27118">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Prepayment:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Prepayment risk occurs when a debt security can be repaid in whole or in part prior to the security's 
maturity and the Fund must reinvest the proceeds it receives, during periods of declining interest rates, 
in securities that pay a lower rate of interest. Also, if a security has been purchased at a premium, 
the value of the premium would be lost in the event of prepayment. Prepayments generally increase when 
interest rates fall.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_Inflation2_S000006928Summary2Member"
      id="ixv-27122">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Inflation:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;  &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The market price of debt securities generally 
falls as inflation increases because the purchasing power of the future income and repaid principal is 
expected to be worth less when received by the Fund. Debt securities that pay a fixed rather than variable 
interest rate are especially vulnerable to inflation risk because variable-rate debt securities may be 
able to participate, over the long term, in rising interest rates which have historically corresponded 
with long-term inflationary trends.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_BondInsurers2_S000006928Summary2Member"
      id="ixv-27145">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Bond 
Insurers:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Market conditions or changes to ratings criteria could adversely impact the 
ratings of municipal bond insurance companies. Downgrades and withdrawal of ratings from municipal bond 
insurers have substantially limited the availability of insurance sought by municipal bond issuers thereby 
reducing the supply of insured municipal securities.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because of the consolidation among municipal 
bond insurers the Fund is subject to additional risks including the risk that credit risk may be concentrated 
among fewer insurers and the risk that events involving one or more municipal bond insurers could have 
a significant adverse effect on the value of the securities insured by an insurer and on the municipal 
markets as a whole.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_UnratedDebtSecurities2_S000006928Summary2Member"
      id="ixv-27150">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Unrated Debt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Certain unrated debt 
securities determined by the investment manager to be of comparable credit quality to rated securities 
which the Fund may purchase may pay a higher interest rate than such rated debt securities and be subject 
to a greater risk of illiquidity or price changes. Less public information and independent credit analysis 
are typically available about unrated securities or issuers, and therefore they may be subject to greater 
risk of default.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_Management2_S000006928Summary2Member"
      id="ixv-27154">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Management:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund is subject to management risk 
because it is an actively managed investment portfolio. The Fund's investment manager applies investment 
techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee 
that these decisions will produce the desired results.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_Cybersecurity2_S000006928Summary2Member"
      id="ixv-27158">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Cybersecurity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain 
access to Fund assets, Fund or customer data (including private shareholder information), or proprietary 
information, cause the Fund, the investment manager, and/or their service providers (including, but not 
limited to, Fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) 
to suffer data breaches, data corruption or loss of operational functionality or prevent Fund investors 
from purchasing, redeeming or exchanging shares or receiving distributions. The investment manager has 
limited ability to prevent or mitigate cybersecurity incidents affecting third party service providers, 
and such third party service providers may have limited indemnification obligations to the Fund or the 
investment manager. Cybersecurity incidents may result in financial losses to the Fund and its shareholders, 
and substantial costs may be incurred in an effort to prevent or mitigate future cybersecurity incidents. 
Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value 
of these securities could decline if the issuers experience cybersecurity incidents.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because technology is 
frequently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a 
chance that some risks have not been identified or prepared for, or that an attack may not be detected, 
which puts limitations on the Fund's ability to plan for or respond to a cyber attack. Like other &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;funds 
and business enterprises, the Fund, the investment manager, and their service providers are subject to 
the risk of cyber incidents occurring from time to time.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111464">Performance</oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-27184">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future. You can obtain updated performance information 
at www.franklintempleton.com or by calling (800) DIAL BEN/342-5236.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.&lt;/p&gt;</oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111465">The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance.</oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111466">The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111467">franklintempleton.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:PerformanceAvailabilityPhone
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111468">(800) DIAL BEN/342-5236</oef:PerformanceAvailabilityPhone>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111469">Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.</oef:BarChartDoesNotReflectSalesLoads>
    <oef:BarChartHeading
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111470">Class 
A Annual Total Returns</oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-27190">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:17.33%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:68%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.67%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Best Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2023, Q4&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;7.89%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Worst Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2022, Q1&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;-6.72%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="2" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:100%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; font-size:1pt;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.09%.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
</oef:BarChartClosingTextBlock>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member"
      id="ixv-111471">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member"
      id="ixv-111472">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111473"
      unitRef="pure">0.0789</oef:BarChartHighestQuarterlyReturn>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member"
      id="ixv-111474">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member"
      id="ixv-111475">2022-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111476"
      unitRef="pure">-0.0672</oef:BarChartLowestQuarterlyReturn>
    <oef:YearToDateReturnLabel
      contextRef="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member"
      id="ixv-111477">As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.09%.</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturnDate
      contextRef="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member"
      id="ixv-111478">2026-03-31</oef:BarChartYearToDateReturnDate>
    <oef:BarChartYearToDateReturn
      contextRef="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111479"
      unitRef="pure">-0.0009</oef:BarChartYearToDateReturn>
    <oef:PerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111480">Average 
Annual Total Returns (figures reflect sales charges) For periods ended December 
31, 2025</oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_C000205907Member_S000006928Member_S000006928Summary2Member"
      id="ixv-111481">Return before taxes</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111482"
      unitRef="pure">-0.0179</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111483"
      unitRef="pure">-0.0107</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111484"
      unitRef="pure">0.0083</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205907Member_S000006928Member_S000006928Summary2Member"
      id="ixv-111485">Return after taxes on 
distributions</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111486"
      unitRef="pure">-0.0180</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111487"
      unitRef="pure">-0.0109</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111488"
      unitRef="pure">0.0082</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205907Member_S000006928Member_S000006928Summary2Member"
      id="ixv-111489">Return after taxes on distributions and sale of Fund shares</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111490"
      unitRef="pure">0.0007</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111491"
      unitRef="pure">-0.0029</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111492"
      unitRef="pure">0.0124</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018794Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111493"
      unitRef="pure">-0.0166</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018794Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111494"
      unitRef="pure">-0.0094</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018794Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111495"
      unitRef="pure">0.0093</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018795Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111496"
      unitRef="pure">0.0059</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018795Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111497"
      unitRef="pure">-0.0077</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018795Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111498"
      unitRef="pure">0.0075</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000194369Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111499"
      unitRef="pure">0.0235</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000194369Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111500"
      unitRef="pure">-0.0001</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20170801_20251231_C000194369Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="_1930_"
      unitRef="pure">0.0130</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000079642Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111502"
      unitRef="pure">0.0229</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000079642Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111503"
      unitRef="pure">-0.0008</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000079642Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111504"
      unitRef="pure">0.0143</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalBondIndex314_S000006928Member_S000006928Summary2Member"
      id="ixv-111505">Bloomberg Municipal Bond 
Index </oef:AverageAnnualReturnLabel>
    <oef:IndexNoDeductionForFeesExpensesTaxes
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-111506">(index reflects no deduction for fees, expenses or taxes)</oef:IndexNoDeductionForFeesExpensesTaxes>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalBondIndex314_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111507"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalBondIndex314_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111508"
      unitRef="pure">0.0080</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalBondIndex314_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-111509"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <oef:ProspectusDate contextRef="Context_20260228_20260228" id="ixv-111510">2026-07-01</oef:ProspectusDate>
    <oef:RiskReturnHeading
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111511">Franklin 
Arizona Tax-Free Income Fund</oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111512">Investment Goal</oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-46505">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;To 
provide investors with as high a level of income exempt from federal income taxes and from personal income 
taxes, if any, for resident shareholders of Arizona as is consistent with prudent investment management 
and the preservation of shareholders&#x2019; capital.&lt;/p&gt;</oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111513">Fees 
and Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-46509">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;These tables describe the fees and expenses that you may pay if you buy, hold 
and sell shares of the Fund. &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;You may pay other fees (including on Class R6 and Advisor Class 
shares), such as brokerage commissions and other fees to financial intermediaries, which are not reflected 
in the tables and examples below.&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor. 
More information about these and other discounts is available from your financial professional and under 
&#x201c;Your Account&#x201d; on page 133 in the Fund&#x2019;s Prospectus and under &#x201c;Buying and Selling 
Shares&#x201d; on page 58 of the Fund&#x2019;s Statement of Additional Information. In addition, more information 
about sales charge discounts and waivers for purchases of shares through specific financial intermediaries 
is set forth in Appendix A &#x2013; &#x201c;Intermediary Sales Charge Discounts and Waivers&#x201d; to the 
Fund&#x2019;s prospectus.&lt;/span&gt;&lt;/p&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111514">You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor.</oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111515"
      unitRef="usd">100000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111516">Shareholder Fees</oef:ShareholderFeesCaption>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111517"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018778Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111518"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018780Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111519"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194363Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111520"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000068550Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111521"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="_1954_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018778Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="_1955_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018780Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111524"
      unitRef="pure">0.0100</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194363Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111525"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000068550Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111526"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:OperatingExpensesCaption
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111527">Annual 
Fund Operating Expenses (expenses that you pay each year as a percentage of the value 
of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111528"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018778Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111529"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018780Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111530"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000194363Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111531"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000068550Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111532"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111533"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018778Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111534"
      unitRef="pure">0.0010</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018780Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111535"
      unitRef="pure">0.0065</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000194363Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111536"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000068550Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111537"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111538"
      unitRef="pure">0.0009</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018778Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111539"
      unitRef="pure">0.0009</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018780Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111540"
      unitRef="pure">0.0008</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194363Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111541"
      unitRef="pure">0.0006</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000068550Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111542"
      unitRef="pure">0.0009</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111543"
      unitRef="pure">0.0083</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018778Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111544"
      unitRef="pure">0.0068</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018780Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111545"
      unitRef="pure">0.0122</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194363Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111546"
      unitRef="pure">0.0055</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000068550Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111547"
      unitRef="pure">0.0058</oef:ExpensesOverAssets>
    <oef:ExpenseExampleHeading
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111548">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-46785">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;This 
Example is intended to help you compare the cost of investing in the Fund with the cost of investing 
in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated 
and then redeem all of your shares at the end of the period. The Example also assumes that your investment 
has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual 
costs may be higher or lower, based on these assumptions your costs would be:&lt;/p&gt;</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111549"
      unitRef="usd">457</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111550"
      unitRef="usd">630</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111551"
      unitRef="usd">818</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111552"
      unitRef="usd">1362</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018778Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111553"
      unitRef="usd">442</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018778Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111554"
      unitRef="usd">585</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018778Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111555"
      unitRef="usd">740</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018778Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111556"
      unitRef="usd">1191</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018780Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111557"
      unitRef="usd">224</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018780Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111558"
      unitRef="usd">387</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018780Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111559"
      unitRef="usd">670</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018780Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111560"
      unitRef="usd">1369</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000194363Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111561"
      unitRef="usd">56</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000194363Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111562"
      unitRef="usd">176</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000194363Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111563"
      unitRef="usd">307</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000194363Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111564"
      unitRef="usd">689</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000068550Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111565"
      unitRef="usd">59</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000068550Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111566"
      unitRef="usd">186</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000068550Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111567"
      unitRef="usd">323</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000068550Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111568"
      unitRef="usd">725</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionByYearCaption
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111569">If you do not sell your shares:</oef:ExpenseExampleNoRedemptionByYearCaption>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Context_20260228_20260228_C000018780Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111570"
      unitRef="usd">124</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Context_20260228_20260228_C000018780Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111571"
      unitRef="usd">387</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Context_20260228_20260228_C000018780Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111572"
      unitRef="usd">670</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Context_20260228_20260228_C000018780Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111573"
      unitRef="usd">1369</oef:ExpenseExampleNoRedemptionYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111574">Portfolio 
Turnover</oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-46972">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities 
(or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs 
and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are 
not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During 
the most recent fiscal year, the Fund's portfolio turnover rate was 17.42% of the average value of its 
portfolio.&lt;/p&gt;</oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111575"
      unitRef="pure">0.1742</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111576">Principal Investment Strategies</oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-46976">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Under 
normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax. In addition, under 
normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest 
free from the personal income taxes, if any, of Arizona. &lt;/p&gt;
&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although 
the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the 
Fund's net assets may be in securities that pay interest that may be subject to the federal alternative 
minimum tax and in securities that pay interest subject to other federal or state income taxes.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories 
by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities 
of comparable credit quality).&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund also may invest up to 35% of its total assets in municipal securities 
issued by U.S. territories.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the investment manager will search for investments across a large number 
of municipal securities that finance different types of projects, from time to time, based on economic 
conditions, the Fund may have significant positions in municipal securities that finance similar types 
of projects.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
investment manager selects securities that it believes will provide the best balance between risk and 
return within the Fund&#x2019;s range of allowable investments and typically invests with a long-term 
time horizon. This means it generally holds securities in the Fund&#x2019;s portfolio for income purposes, 
although the investment manager may sell a security at any time if it believes it could help the Fund 
meet its goal. With a focus on income, individual securities are considered for purchase or sale based 
on various factors and considerations, including credit profile, risk, structure, pricing, portfolio 
impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities. 
&lt;/p&gt;</oef:StrategyNarrativeTextBlock>
    <oef:StrategyPortfolioConcentration
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111577">Under 
normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax.</oef:StrategyPortfolioConcentration>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111578">Under 
normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax. In addition, under 
normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest 
free from the personal income taxes, if any, of Arizona</fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111579">Under 
normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax. In addition, under 
normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest 
free from the personal income taxes, if any, of Arizona</fnd:NmRule35d1TermDfnSmryTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_PrincipalRisks2_S000006922Summary3Member"
      id="ixv-47002">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:13.0pt; font-family:Arial; text-align:left; color:#004C97; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:13.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:normal; text-decoration:none;"&gt;Principal Risks&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;You could lose money by investing in the 
Fund. Mutual fund shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, 
and are not insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other 
agency of the U.S. government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_RiskLoseMoneyMember_S000006922Summary3Member"
      id="ixv-111582">You could lose money by investing in the 
Fund.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_RiskNotInsuredMember_S000006922Summary3Member"
      id="ixv-111583">Mutual fund shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, 
and are not insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other 
agency of the U.S. government.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_InterestRate2_S000006922Summary3Member"
      id="ixv-47006">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Interest Rate:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  When interest rates rise, debt security 
prices generally fall. The opposite is also generally true: debt security prices rise when interest rates 
fall. Interest rate changes are influenced by a number of factors, including government policy, monetary 
policy, inflation expectations, perceptions of risk, and supply of and demand for bonds. In general, 
securities with longer maturities or durations are more sensitive to interest rate changes. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_Credit2_S000006922Summary3Member"
      id="ixv-47010">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Credit:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 An issuer of debt securities may fail to make interest payments or repay principal when due, in whole 
or in part. Changes in an issuer's financial strength or in a security's or government's credit rating 
may affect a security's value. A change in the credit rating of a municipal bond insurer that insures 
securities in the Fund&#x2019;s portfolio may affect the value of the securities it insures, the Fund&#x2019;s 
share price and &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Fund 
performance. The Fund might also be adversely impacted by the inability of an insurer to meet its insurance 
obligations.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_Liquidity2_S000006922Summary3Member"
      id="ixv-47034">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The trading market for a particular security or type of security or other investments in which the Fund 
invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the 
Fund&#x2019;s ability to sell such securities or other investments when necessary to meet the Fund&#x2019;s 
liquidity needs, which may arise or increase in response to a specific economic event or because the 
investment manager wishes to purchase particular investments or believes that a higher level of liquidity 
would be advantageous. Reduced liquidity will also generally lower the value of such securities or other 
investments. Market prices for such securities or other investments may be relatively volatile.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_TaxLegislativeandPoliticalChanges2_S000006922Summary3Member"
      id="ixv-47038">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax 
Legislative and Political Changes:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The municipal securities market could be significantly affected 
by adverse political and legislative changes or litigation at the federal or state level. The value of 
municipal bonds is closely tied to the benefits of tax-exempt income to investors. Significant revisions 
of federal income tax laws or regulations revising income tax rates or the tax-exempt character of municipal 
bonds, or even proposed changes and deliberations on this topic by the federal government, could cause 
municipal bond prices to fall. For example, lower federal income tax rates would reduce certain relative 
advantages of owning municipal bonds, and lower state income tax rates could have similar effects. In 
addition, the application of corporate minimum tax rates to financial statement income may have the effect 
of reducing demand for municipal bonds among corporate investors, which may in turn impact municipal 
bond prices.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_Tax-ExemptSecurities2_S000006922Summary3Member"
      id="ixv-47042">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax-Exempt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Failure of a municipal security issuer 
to comply with applicable tax requirements may make income paid thereon taxable, resulting in a decline 
in the security&#x2019;s value. In addition, there could be changes in applicable tax laws or tax treatments 
that reduce or eliminate the current federal income tax exemption on municipal securities or otherwise 
adversely affect the current federal or state tax status of municipal securities.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_Market2_S000006922Summary3Member"
      id="ixv-47046">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Market: 
 &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The 
market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly 
or unpredictably. The market value of a security or other investment may be reduced by market activity 
or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all 
investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more 
buyers than sellers, prices tend to rise. In addition, the value of the Fund&#x2019;s investments may 
go up or down due to general market or other conditions that are not specifically related to a particular 
issuer, such as: real or perceived adverse economic changes, including widespread liquidity issues and 
defaults in one or more industries; changes in interest, inflation or exchange rates; unexpected natural 
and man-made world events, such as diseases or disasters; financial, political or social disruptions, 
including terrorism and war; and U.S. trade &lt;/span&gt;&lt;/p&gt;

&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;disputes 
or other disputes with specific countries that could result in additional tariffs, trade barriers and/or 
investment restrictions in certain securities in those countries. Any of these conditions can adversely 
affect the economic prospects of many companies, sectors, nations, regions and the market in general, 
in ways that cannot necessarily be foreseen.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Ongoing or threatened armed conflicts throughout the world 
have caused and could continue to cause significant market disruptions and volatility. The hostilities 
and sanctions resulting from those hostilities could have a significant impact on certain investments 
of the Fund as well as the Fund&#x2019;s performance and liquidity.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_Arizona2_S000006922Summary3Member"
      id="ixv-47071">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Arizona:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund invests predominantly in Arizona municipal securities. Therefore, events in Arizona are likely 
to affect the Fund&#x2019;s investments and its performance. These events may include economic or political 
policy changes, tax base erosion, unfunded pension and healthcare liabilities, constitutional limits 
on tax increases, budget deficits and other financial difficulties, and changes in the credit ratings 
assigned to municipal issuers of Arizona. The same is true of events in other states or U.S. territories, 
to the extent that the Fund has exposure to any other state or territory at any given time.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_Focus2_S000006922Summary3Member"
      id="ixv-47075">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Focus:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund may invest more than 25% of its assets in municipal securities that finance similar types of 
projects, such as utilities, hospitals, higher education and transportation. A change that affects one 
project, such as proposed legislation on the financing of the project, a shortage of the materials needed 
for the project, or a declining need for the project, would likely affect all similar projects, thereby 
increasing market risk.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_Income2_S000006922Summary3Member"
      id="ixv-47079">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Income:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund's distributions to shareholders 
may decline when prevailing interest rates fall, when the Fund experiences defaults on debt securities 
it holds or when the Fund realizes a loss upon the sale of a debt security. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_Prepayment2_S000006922Summary3Member"
      id="ixv-47083">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Prepayment:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Prepayment risk occurs when a debt security can be repaid in whole or in part prior to the security's 
maturity and the Fund must reinvest the proceeds it receives, during periods of declining interest rates, 
in securities that pay a lower rate of interest. Also, if a security has been purchased at a premium, 
the value of the premium would be lost in the event of prepayment. Prepayments generally increase when 
interest rates fall.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_Inflation2_S000006922Summary3Member"
      id="ixv-47087">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Inflation:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;  &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The market price of debt securities generally 
falls as inflation increases because the purchasing power of the future income and repaid principal is 
expected to be worth less when received by the Fund. Debt securities that pay a fixed rather than variable 
interest rate are especially vulnerable to inflation risk because variable-rate debt securities may be 
able to participate, over the long term, in rising interest rates which have historically corresponded 
with long-term inflationary trends.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_BondInsurers2_S000006922Summary3Member"
      id="ixv-47110">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Bond 
Insurers:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Market conditions or changes to ratings criteria could adversely impact the 
ratings of municipal bond insurance companies. Downgrades and withdrawal of ratings from municipal bond 
insurers have substantially limited the availability of insurance sought by municipal bond issuers thereby 
reducing the supply of insured municipal securities.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because of the consolidation among municipal 
bond insurers the Fund is subject to additional risks including the risk that credit risk may be concentrated 
among fewer insurers and the risk that events involving one or more municipal bond insurers could have 
a significant adverse effect on the value of the securities insured by an insurer and on the municipal 
markets as a whole.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_UnratedDebtSecurities2_S000006922Summary3Member"
      id="ixv-47115">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Unrated Debt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Certain unrated debt 
securities determined by the investment manager to be of comparable credit quality to rated securities 
which the Fund may purchase may pay a higher interest rate than such rated debt securities and be subject 
to a greater risk of illiquidity or price changes. Less public information and independent credit analysis 
are typically available about unrated securities or issuers, and therefore they may be subject to greater 
risk of default.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_Management2_S000006922Summary3Member"
      id="ixv-47119">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Management:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund is subject to management risk 
because it is an actively managed investment portfolio. The Fund's investment manager applies investment 
techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee 
that these decisions will produce the desired results.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_Cybersecurity2_S000006922Summary3Member"
      id="ixv-47123">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Cybersecurity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain 
access to Fund assets, Fund or customer data (including private shareholder information), or proprietary 
information, cause the Fund, the investment manager, and/or their service providers (including, but not 
limited to, Fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) 
to suffer data breaches, data corruption or loss of operational functionality or prevent Fund investors 
from purchasing, redeeming or exchanging shares or receiving distributions. The investment manager has 
limited ability to prevent or mitigate cybersecurity incidents affecting third party service providers, 
and such third party service providers may have limited indemnification obligations to the Fund or the 
investment manager. Cybersecurity incidents may result in financial losses to the Fund and its shareholders, 
and substantial costs may be incurred in an effort to prevent or mitigate future cybersecurity incidents. 
Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value 
of these securities could decline if the issuers experience cybersecurity incidents.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because technology is 
frequently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a 
chance that some risks have not been identified or prepared for, or that an attack may not be detected, 
which puts limitations on the Fund's ability to plan for or respond to a cyber attack. Like other &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;funds 
and business enterprises, the Fund, the investment manager, and their service providers are subject to 
the risk of cyber incidents occurring from time to time.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111584">Performance</oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-47150">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
following bar chart and table provide some indication of the risks of investing in the Fund. The bar 
chart shows changes in the Fund's performance from year to year for Class A shares. The table shows how 
the Fund's average annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared 
with those of a broad measure of market performance. The Fund's past performance (before and after taxes) 
is not necessarily an indication of how the Fund will perform in the future. You can obtain updated performance 
information at www.franklintempleton.com or by calling (800) DIAL BEN/342-5236.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Sales charges are not 
reflected in the bar chart, and if those charges were included, returns would be less than those shown.&lt;/p&gt;</oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111585">The 
following bar chart and table provide some indication of the risks of investing in the Fund. The bar 
chart shows changes in the Fund's performance from year to year for Class A shares. The table shows how 
the Fund's average annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared 
with those of a broad measure of market performance.</oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111586">The Fund's past performance (before and after taxes) 
is not necessarily an indication of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111587">franklintempleton.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:PerformanceAvailabilityPhone
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111588">(800) DIAL BEN/342-5236</oef:PerformanceAvailabilityPhone>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111589">Sales charges are not 
reflected in the bar chart, and if those charges were included, returns would be less than those shown.</oef:BarChartDoesNotReflectSalesLoads>
    <oef:BarChartHeading
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111590">Class A Annual Total Returns</oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-47156">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:17.33%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:68%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.67%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Best Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2023, Q4&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;7.76%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Worst Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2022, Q1&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;-6.35%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="2" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:100%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; font-size:1pt;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.11%.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
</oef:BarChartClosingTextBlock>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member"
      id="ixv-111591">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member"
      id="ixv-111592">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111593"
      unitRef="pure">0.0776</oef:BarChartHighestQuarterlyReturn>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member"
      id="ixv-111594">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member"
      id="ixv-111595">2022-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111596"
      unitRef="pure">-0.0635</oef:BarChartLowestQuarterlyReturn>
    <oef:YearToDateReturnLabel
      contextRef="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member"
      id="ixv-111597">As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.11%.</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturnDate
      contextRef="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member"
      id="ixv-111598">2026-03-31</oef:BarChartYearToDateReturnDate>
    <oef:BarChartYearToDateReturn
      contextRef="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111599"
      unitRef="pure">-0.0011</oef:BarChartYearToDateReturn>
    <oef:PerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111600">Average 
Annual Total Returns (figures reflect sales charges) For periods ended December 
31, 2025</oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_C000205901Member_S000006922Member_S000006922Summary3Member"
      id="ixv-111601">Return before taxes</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111602"
      unitRef="pure">-0.0083</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111603"
      unitRef="pure">-0.0048</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111604"
      unitRef="pure">0.0144</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205901Member_S000006922Member_S000006922Summary3Member"
      id="ixv-111605">Return after taxes on 
distributions</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111606"
      unitRef="pure">-0.0084</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111607"
      unitRef="pure">-0.0050</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111608"
      unitRef="pure">0.0143</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205901Member_S000006922Member_S000006922Summary3Member"
      id="ixv-111609">Return after taxes on distributions and sale of Fund shares</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111610"
      unitRef="pure">0.0075</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111611"
      unitRef="pure">0.0024</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111612"
      unitRef="pure">0.0176</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018778Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111613"
      unitRef="pure">-0.0066</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018778Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111614"
      unitRef="pure">-0.0032</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018778Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111615"
      unitRef="pure">0.0153</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018780Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111616"
      unitRef="pure">0.0157</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018780Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111617"
      unitRef="pure">-0.0016</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018780Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111618"
      unitRef="pure">0.0133</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000194363Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111619"
      unitRef="pure">0.0332</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000194363Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111620"
      unitRef="pure">0.0057</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20170801_20251231_C000194363Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="_2087_"
      unitRef="pure">0.0196</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000068550Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111622"
      unitRef="pure">0.0328</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000068550Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111623"
      unitRef="pure">0.0054</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000068550Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111624"
      unitRef="pure">0.0202</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalBondIndex315_S000006922Member_S000006922Summary3Member"
      id="ixv-111625">Bloomberg Municipal Bond 
Index </oef:AverageAnnualReturnLabel>
    <oef:IndexNoDeductionForFeesExpensesTaxes
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-111626">(index reflects no deduction for fees, expenses or taxes)</oef:IndexNoDeductionForFeesExpensesTaxes>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalBondIndex315_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111627"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalBondIndex315_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111628"
      unitRef="pure">0.0080</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalBondIndex315_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-111629"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111630">Franklin 
Colorado Tax-Free Income Fund</oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111631">Investment Goal</oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-47541">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;To provide investors with 
as high a level of income exempt from federal income taxes and from personal income taxes, if any, for 
resident shareholders of Colorado as is consistent with prudent investment management and the preservation 
of shareholders&#x2019; capital.&lt;/p&gt;</oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111632">Fees and Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-47544">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;These tables describe 
the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;You may pay other fees 
(including on Class R6 and Advisor Class shares), such as brokerage commissions and other fees to financial 
intermediaries, which are not reflected in the tables and examples below.&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; You may qualify for 
sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at 
least $100,000 in Franklin Templeton funds and certain other funds distributed through Franklin Distributors, 
LLC, the Fund&#x2019;s distributor. More information about these and other discounts is available from 
your financial professional and under &#x201c;Your Account&#x201d; on page 133 in the Fund&#x2019;s Prospectus 
and under &#x201c;Buying and Selling Shares&#x201d; on page 58 of the Fund&#x2019;s Statement of Additional 
Information. In addition, more information about sales charge discounts and waivers for purchases of 
shares through specific financial intermediaries is set forth in Appendix A &#x2013; &#x201c;Intermediary 
Sales Charge Discounts and Waivers&#x201d; to the Fund&#x2019;s prospectus.&lt;/span&gt;&lt;/p&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111633">You may qualify for 
sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at 
least $100,000 in Franklin Templeton funds and certain other funds distributed through Franklin Distributors, 
LLC, the Fund&#x2019;s distributor.</oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111634"
      unitRef="usd">100000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111635">Shareholder 
Fees</oef:ShareholderFeesCaption>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111636"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018796Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111637"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018797Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111638"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194370Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111639"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000079643Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111640"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="_2109_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018796Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="_2110_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018797Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111643"
      unitRef="pure">0.0100</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194370Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111644"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000079643Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111645"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:OperatingExpensesCaption
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111646">Annual 
Fund Operating Expenses (expenses that you pay each year as a percentage of the value 
of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111647"
      unitRef="pure">0.0050</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018796Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111648"
      unitRef="pure">0.0050</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018797Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111649"
      unitRef="pure">0.0050</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000194370Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111650"
      unitRef="pure">0.0050</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000079643Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111651"
      unitRef="pure">0.0050</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111652"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018796Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111653"
      unitRef="pure">0.0010</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018797Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111654"
      unitRef="pure">0.0065</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000194370Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111655"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000079643Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111656"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111657"
      unitRef="pure">0.0012</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018796Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111658"
      unitRef="pure">0.0012</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018797Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111659"
      unitRef="pure">0.0011</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194370Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111660"
      unitRef="pure">0.0008</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079643Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111661"
      unitRef="pure">0.0012</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111662"
      unitRef="pure">0.0087</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018796Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111663"
      unitRef="pure">0.0072</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018797Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111664"
      unitRef="pure">0.0126</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194370Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111665"
      unitRef="pure">0.0058</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079643Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111666"
      unitRef="pure">0.0062</oef:ExpensesOverAssets>
    <oef:ExpenseExampleHeading
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111667">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-47820">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;This 
Example is intended to help you compare the cost of investing in the Fund with the cost of investing 
in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated 
and then redeem all of your shares at the end of the period. The Example also assumes that your investment 
has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual 
costs may be higher or lower, based on these assumptions your costs would be:&lt;/p&gt;</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111668"
      unitRef="usd">460</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111669"
      unitRef="usd">642</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111670"
      unitRef="usd">838</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111671"
      unitRef="usd">1406</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018796Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111672"
      unitRef="usd">446</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018796Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111673"
      unitRef="usd">597</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018796Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111674"
      unitRef="usd">761</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018796Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111675"
      unitRef="usd">1236</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018797Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111676"
      unitRef="usd">228</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018797Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111677"
      unitRef="usd">399</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018797Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111678"
      unitRef="usd">691</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018797Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111679"
      unitRef="usd">1414</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000194370Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111680"
      unitRef="usd">59</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000194370Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111681"
      unitRef="usd">186</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000194370Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111682"
      unitRef="usd">323</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000194370Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111683"
      unitRef="usd">725</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000079643Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111684"
      unitRef="usd">63</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000079643Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111685"
      unitRef="usd">198</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000079643Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111686"
      unitRef="usd">345</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000079643Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111687"
      unitRef="usd">774</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionByYearCaption
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111688">If you do not sell your shares:</oef:ExpenseExampleNoRedemptionByYearCaption>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Context_20260228_20260228_C000018797Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111689"
      unitRef="usd">128</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Context_20260228_20260228_C000018797Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111690"
      unitRef="usd">399</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Context_20260228_20260228_C000018797Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111691"
      unitRef="usd">691</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Context_20260228_20260228_C000018797Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111692"
      unitRef="usd">1414</oef:ExpenseExampleNoRedemptionYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111693">Portfolio 
Turnover</oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-48006">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities 
(or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs 
and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are 
not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During 
the most recent fiscal year, the Fund's portfolio turnover rate was 11.43% of the average value of its 
portfolio.&lt;/p&gt;</oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111694"
      unitRef="pure">0.1143</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111695">Principal Investment Strategies</oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-48009">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Under normal market conditions, 
the Fund invests at least 80% of its net assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Colorado. &lt;/p&gt;
&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although 
the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the 
Fund's net assets may be in securities that pay interest that may be subject to the federal alternative 
minimum tax and in securities that pay interest subject to other federal or state income taxes.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories 
by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities 
of comparable credit quality).&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund also may invest up to 35% of its total assets in municipal securities 
issued by U.S. territories.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the investment manager will search for investments across a large number 
of municipal securities that finance different types of projects, from time to time, based on economic 
conditions, the Fund may have significant positions in municipal securities that finance similar types 
of projects.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
investment manager selects securities that it believes will provide the best balance between risk and 
return within the Fund&#x2019;s range of allowable investments and typically invests with a long-term 
time horizon. This means it generally holds securities in the Fund&#x2019;s portfolio for income purposes, 
although the investment manager may sell a security at any time if it believes it could help the Fund 
meet its goal. With a focus on income, individual securities are considered for purchase or sale based 
on various factors and considerations, including credit profile, risk, structure, pricing, portfolio 
impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities. 
&lt;/p&gt;</oef:StrategyNarrativeTextBlock>
    <oef:StrategyPortfolioConcentration
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111696">Under normal market conditions, 
the Fund invests at least 80% of its net assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax.</oef:StrategyPortfolioConcentration>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111697">Under normal market conditions, 
the Fund invests at least 80% of its net assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Colorado</fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111698">Under normal market conditions, 
the Fund invests at least 80% of its net assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Colorado</fnd:NmRule35d1TermDfnSmryTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_PrincipalRisks2_S000006929Summary3Member"
      id="ixv-48035">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:13.0pt; font-family:Arial; text-align:left; color:#004C97; font-weight:normal; text-decoration:none;"&gt;Principal Risks&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;You could lose money by investing in the Fund. Mutual fund 
shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_RiskLoseMoneyMember_S000006929Summary3Member"
      id="ixv-111701">You could lose money by investing in the Fund.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_RiskNotInsuredMember_S000006929Summary3Member"
      id="ixv-111702">Mutual fund 
shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_InterestRate2_S000006929Summary3Member"
      id="ixv-48038">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Interest 
Rate:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 When interest rates rise, debt security prices generally fall. The opposite is also generally true: 
debt security prices rise when interest rates fall. Interest rate changes are influenced by a number 
of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, 
and supply of and demand for bonds. In general, securities with longer maturities or durations are more 
sensitive to interest rate changes. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_Credit2_S000006929Summary3Member"
      id="ixv-48042">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Credit:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  An issuer of debt securities may fail 
to make interest payments or repay principal when due, in whole or in part. Changes in an issuer's financial 
strength or in a security's or government's credit rating may affect a security's value. A change in 
the credit rating of a municipal bond insurer that insures securities in the Fund&#x2019;s portfolio may 
affect the value of the securities it insures, the Fund&#x2019;s share price and &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Fund 
performance. The Fund might also be adversely impacted by the inability of an insurer to meet its insurance 
obligations.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_Liquidity2_S000006929Summary3Member"
      id="ixv-48066">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The trading market for a particular security or type of security or other investments in which the Fund 
invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the 
Fund&#x2019;s ability to sell such securities or other investments when necessary to meet the Fund&#x2019;s 
liquidity needs, which may arise or increase in response to a specific economic event or because the 
investment manager wishes to purchase particular investments or believes that a higher level of liquidity 
would be advantageous. Reduced liquidity will also generally lower the value of such securities or other 
investments. Market prices for such securities or other investments may be relatively volatile.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_TaxLegislativeandPoliticalChanges2_S000006929Summary3Member"
      id="ixv-48070">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax 
Legislative and Political Changes:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The municipal securities market could be significantly affected 
by adverse political and legislative changes or litigation at the federal or state level. The value of 
municipal bonds is closely tied to the benefits of tax-exempt income to investors. Significant revisions 
of federal income tax laws or regulations revising income tax rates or the tax-exempt character of municipal 
bonds, or even proposed changes and deliberations on this topic by the federal government, could cause 
municipal bond prices to fall. For example, lower federal income tax rates would reduce certain relative 
advantages of owning municipal bonds, and lower state income tax rates could have similar effects. In 
addition, the application of corporate minimum tax rates to financial statement income may have the effect 
of reducing demand for municipal bonds among corporate investors, which may in turn impact municipal 
bond prices.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_Tax-ExemptSecurities2_S000006929Summary3Member"
      id="ixv-48074">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax-Exempt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Failure of a municipal security issuer 
to comply with applicable tax requirements may make income paid thereon taxable, resulting in a decline 
in the security&#x2019;s value. In addition, there could be changes in applicable tax laws or tax treatments 
that reduce or eliminate the current federal income tax exemption on municipal securities or otherwise 
adversely affect the current federal or state tax status of municipal securities.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_Market2_S000006929Summary3Member"
      id="ixv-48078">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Market: 
 &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The 
market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly 
or unpredictably. The market value of a security or other investment may be reduced by market activity 
or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all 
investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more 
buyers than sellers, prices tend to rise. In addition, the value of the Fund&#x2019;s investments may 
go up or down due to general market or other conditions that are not specifically related to a particular 
issuer, such as: real or perceived adverse economic changes, including widespread liquidity issues and 
defaults in one or more industries; changes in interest, inflation or exchange rates; unexpected natural 
and man-made world events, such as diseases or disasters; financial, political or social disruptions, 
including terrorism and war; and U.S. trade &lt;/span&gt;&lt;/p&gt;

&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;disputes 
or other disputes with specific countries that could result in additional tariffs, trade barriers and/or 
investment restrictions in certain securities in those countries. Any of these conditions can adversely 
affect the economic prospects of many companies, sectors, nations, regions and the market in general, 
in ways that cannot necessarily be foreseen.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Ongoing or threatened armed conflicts throughout the world 
have caused and could continue to cause significant market disruptions and volatility. The hostilities 
and sanctions resulting from those hostilities could have a significant impact on certain investments 
of the Fund as well as the Fund&#x2019;s performance and liquidity.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_Colorado2_S000006929Summary3Member"
      id="ixv-48103">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Colorado:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund invests predominantly in Colorado municipal securities. Therefore, events in Colorado are likely 
to affect the Fund&#x2019;s investments and its performance. These events may include economic or political 
policy changes, tax base erosion, unfunded pension and healthcare liabilities, constitutional limits 
on tax increases, budget deficits and other financial difficulties, and changes in the credit ratings 
assigned to municipal issuers of Colorado. The same is true of events in other states or U.S. territories, 
to the extent that the Fund has exposure to any other state or territory at any given time.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_Focus2_S000006929Summary3Member"
      id="ixv-48107">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Focus:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund may invest more than 25% of its assets in municipal securities that finance similar types of 
projects, such as utilities, hospitals, higher education and transportation. A change that affects one 
project, such as proposed legislation on the financing of the project, a shortage of the materials needed 
for the project, or a declining need for the project, would likely affect all similar projects, thereby 
increasing market risk.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_Income2_S000006929Summary3Member"
      id="ixv-48111">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Income:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund's distributions to shareholders 
may decline when prevailing interest rates fall, when the Fund experiences defaults on debt securities 
it holds or when the Fund realizes a loss upon the sale of a debt security. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_Prepayment2_S000006929Summary3Member"
      id="ixv-48115">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Prepayment:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Prepayment risk occurs when a debt security can be repaid in whole or in part prior to the security's 
maturity and the Fund must reinvest the proceeds it receives, during periods of declining interest rates, 
in securities that pay a lower rate of interest. Also, if a security has been purchased at a premium, 
the value of the premium would be lost in the event of prepayment. Prepayments generally increase when 
interest rates fall.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_Inflation2_S000006929Summary3Member"
      id="ixv-48119">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Inflation:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;  &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The market price of debt securities generally 
falls as inflation increases because the purchasing power of the future income and repaid principal is 
expected to be worth less when received by the Fund. Debt securities that pay a fixed rather than variable 
interest rate are especially vulnerable to inflation risk because variable-rate debt securities may be 
able to participate, over the long term, in rising interest rates which have historically corresponded 
with long-term inflationary trends.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_BondInsurers2_S000006929Summary3Member"
      id="ixv-48142">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Bond 
Insurers:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Market conditions or changes to ratings criteria could adversely impact the 
ratings of municipal bond insurance companies. Downgrades and withdrawal of ratings from municipal bond 
insurers have substantially limited the availability of insurance sought by municipal bond issuers thereby 
reducing the supply of insured municipal securities.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because of the consolidation among municipal 
bond insurers the Fund is subject to additional risks including the risk that credit risk may be concentrated 
among fewer insurers and the risk that events involving one or more municipal bond insurers could have 
a significant adverse effect on the value of the securities insured by an insurer and on the municipal 
markets as a whole.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_UnratedDebtSecurities2_S000006929Summary3Member"
      id="ixv-48147">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Unrated Debt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Certain unrated debt 
securities determined by the investment manager to be of comparable credit quality to rated securities 
which the Fund may purchase may pay a higher interest rate than such rated debt securities and be subject 
to a greater risk of illiquidity or price changes. Less public information and independent credit analysis 
are typically available about unrated securities or issuers, and therefore they may be subject to greater 
risk of default.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_Management2_S000006929Summary3Member"
      id="ixv-48151">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Management:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund is subject to management risk 
because it is an actively managed investment portfolio. The Fund's investment manager applies investment 
techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee 
that these decisions will produce the desired results.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_Cybersecurity2_S000006929Summary3Member"
      id="ixv-48155">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Cybersecurity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain 
access to Fund assets, Fund or customer data (including private shareholder information), or proprietary 
information, cause the Fund, the investment manager, and/or their service providers (including, but not 
limited to, Fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) 
to suffer data breaches, data corruption or loss of operational functionality or prevent Fund investors 
from purchasing, redeeming or exchanging shares or receiving distributions. The investment manager has 
limited ability to prevent or mitigate cybersecurity incidents affecting third party service providers, 
and such third party service providers may have limited indemnification obligations to the Fund or the 
investment manager. Cybersecurity incidents may result in financial losses to the Fund and its shareholders, 
and substantial costs may be incurred in an effort to prevent or mitigate future cybersecurity incidents. 
Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value 
of these securities could decline if the issuers experience cybersecurity incidents.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because technology is 
frequently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a 
chance that some risks have not been identified or prepared for, or that an attack may not be detected, 
which puts limitations on the Fund's ability to plan for or respond to a cyber attack. Like other &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;funds 
and business enterprises, the Fund, the investment manager, and their service providers are subject to 
the risk of cyber incidents occurring from time to time.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111703">Performance</oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-48181">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future. You can obtain updated performance information 
at www.franklintempleton.com or by calling (800) DIAL BEN/342-5236.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.&lt;/p&gt;</oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111704">The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance.</oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111705">The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111706">franklintempleton.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:PerformanceAvailabilityPhone
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111707">(800) DIAL BEN/342-5236</oef:PerformanceAvailabilityPhone>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111708">Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.</oef:BarChartDoesNotReflectSalesLoads>
    <oef:BarChartHeading
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111709">Class 
A Annual Total Returns</oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-48187">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:17.33%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:68%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.67%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Best Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2023, Q4&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;8.21%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Worst Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2022, Q1&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;-6.26%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="2" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:100%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; font-size:1pt;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.16%.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
</oef:BarChartClosingTextBlock>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member"
      id="ixv-111710">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member"
      id="ixv-111711">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111712"
      unitRef="pure">0.0821</oef:BarChartHighestQuarterlyReturn>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member"
      id="ixv-111713">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member"
      id="ixv-111714">2022-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111715"
      unitRef="pure">-0.0626</oef:BarChartLowestQuarterlyReturn>
    <oef:YearToDateReturnLabel
      contextRef="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member"
      id="ixv-111716">As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.16%.</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturnDate
      contextRef="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member"
      id="ixv-111717">2026-03-31</oef:BarChartYearToDateReturnDate>
    <oef:BarChartYearToDateReturn
      contextRef="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111718"
      unitRef="pure">-0.0016</oef:BarChartYearToDateReturn>
    <oef:PerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111719">Average 
Annual Total Returns (figures reflect sales charges) For periods ended December 
31, 2025</oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_C000205908Member_S000006929Member_S000006929Summary3Member"
      id="ixv-111720">Return before taxes</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111721"
      unitRef="pure">-0.0054</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111722"
      unitRef="pure">-0.0047</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111723"
      unitRef="pure">0.0137</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205908Member_S000006929Member_S000006929Summary3Member"
      id="ixv-111724">Return after taxes on 
distributions</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111725"
      unitRef="pure">-0.0055</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111726"
      unitRef="pure">-0.0049</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111727"
      unitRef="pure">0.0136</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205908Member_S000006929Member_S000006929Summary3Member"
      id="ixv-111728">Return after taxes on distributions and sale of Fund shares</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111729"
      unitRef="pure">0.0092</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111730"
      unitRef="pure">0.0022</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111731"
      unitRef="pure">0.0170</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018796Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111732"
      unitRef="pure">-0.0030</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018796Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111733"
      unitRef="pure">-0.0031</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018796Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111734"
      unitRef="pure">0.0149</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018797Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111735"
      unitRef="pure">0.0197</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018797Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111736"
      unitRef="pure">-0.0015</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018797Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111737"
      unitRef="pure">0.0129</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000194370Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111738"
      unitRef="pure">0.0364</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000194370Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111739"
      unitRef="pure">0.0057</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20170801_20251231_C000194370Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="_2242_"
      unitRef="pure">0.0190</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000079643Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111741"
      unitRef="pure">0.0369</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000079643Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111742"
      unitRef="pure">0.0055</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000079643Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111743"
      unitRef="pure">0.0197</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalBondIndex316_S000006929Member_S000006929Summary3Member"
      id="ixv-111744">Bloomberg Municipal Bond 
Index </oef:AverageAnnualReturnLabel>
    <oef:IndexNoDeductionForFeesExpensesTaxes
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-111745">(index reflects no deduction for fees, expenses or taxes)</oef:IndexNoDeductionForFeesExpensesTaxes>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalBondIndex316_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111746"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalBondIndex316_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111747"
      unitRef="pure">0.0080</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalBondIndex316_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-111748"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111749">Franklin 
Connecticut Tax-Free Income Fund</oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111750">Investment Goal</oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-48566">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;To provide investors with 
as high a level of income exempt from federal income taxes and from personal income taxes, if any, for 
resident shareholders of Connecticut as is consistent with prudent investment management and the preservation 
of shareholders&#x2019; capital.&lt;/p&gt;</oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111751">Fees and Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-48569">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;These tables describe 
the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;You may pay other fees 
(including on Class R6 and Advisor Class shares), such as brokerage commissions and other fees to financial 
intermediaries, which are not reflected in the tables and examples below.&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; You may qualify for 
sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at 
least $100,000 in Franklin Templeton funds and certain other funds distributed through Franklin Distributors, 
LLC, the Fund&#x2019;s distributor. More information about these and other discounts is available from 
your financial professional and under &#x201c;Your Account&#x201d; on page 133 in the Fund&#x2019;s Prospectus 
and under &#x201c;Buying and Selling Shares&#x201d; on page 58 of the Fund&#x2019;s Statement of Additional 
Information. In addition, more information about sales charge discounts and waivers for purchases of 
shares through specific financial intermediaries is set forth in Appendix A &#x2013; &#x201c;Intermediary 
Sales Charge Discounts and Waivers&#x201d; to the Fund&#x2019;s prospectus.&lt;/span&gt;&lt;/p&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111752">You may qualify for 
sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at 
least $100,000 in Franklin Templeton funds and certain other funds distributed through Franklin Distributors, 
LLC, the Fund&#x2019;s distributor.</oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111753"
      unitRef="usd">100000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111754">Shareholder 
Fees</oef:ShareholderFeesCaption>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111755"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018798Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111756"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018799Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111757"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194371Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111758"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000079644Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111759"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="_2264_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018798Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="_2265_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018799Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111762"
      unitRef="pure">0.0100</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194371Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111763"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000079644Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111764"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:OperatingExpensesCaption
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111765">Annual 
Fund Operating Expenses (expenses that you pay each year as a percentage of the value 
of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111766"
      unitRef="pure">0.0059</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018798Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111767"
      unitRef="pure">0.0059</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018799Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111768"
      unitRef="pure">0.0059</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000194371Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111769"
      unitRef="pure">0.0059</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000079644Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111770"
      unitRef="pure">0.0059</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111771"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018798Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111772"
      unitRef="pure">0.0010</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018799Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111773"
      unitRef="pure">0.0065</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000194371Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111774"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000079644Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111775"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111776"
      unitRef="pure">0.0017</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018798Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111777"
      unitRef="pure">0.0017</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018799Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111778"
      unitRef="pure">0.0017</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194371Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111779"
      unitRef="pure">0.0011</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079644Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111780"
      unitRef="pure">0.0018</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111781"
      unitRef="pure">0.0101</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018798Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111782"
      unitRef="pure">0.0086</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018799Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111783"
      unitRef="pure">0.0141</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194371Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111784"
      unitRef="pure">0.0070</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079644Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111785"
      unitRef="pure">0.0077</oef:ExpensesOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="_2290_"
      unitRef="pure">-0.0011</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000018798Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="_2291_"
      unitRef="pure">-0.0011</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000018799Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="_2292_"
      unitRef="pure">-0.0011</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000194371Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="_2293_"
      unitRef="pure">-0.0008</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets
      contextRef="Context_20260228_20260228_C000079644Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="_2294_"
      unitRef="pure">-0.0012</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111791"
      unitRef="pure">0.0090</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018798Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111792"
      unitRef="pure">0.0075</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018799Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111793"
      unitRef="pure">0.0130</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194371Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111794"
      unitRef="pure">0.0062</oef:NetExpensesOverAssets>
    <oef:NetExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079644Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111795"
      unitRef="pure">0.0065</oef:NetExpensesOverAssets>
    <oef:ExpenseExampleHeading
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111796">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-48896">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;This 
Example is intended to help you compare the cost of investing in the Fund with the cost of investing 
in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated 
and then redeem all of your shares at the end of the period. The Example also assumes that your investment 
has a 5% return each year and that the Fund's operating expenses remain the same. The Example reflects 
adjustments made to the Fund's operating expenses due to the fee waivers and/or expense reimbursements 
by management for the 1 Year numbers only. Although your actual costs may be higher or lower, based on 
these assumptions your costs would be:&lt;/p&gt;</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111797"
      unitRef="usd">463</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111798"
      unitRef="usd">673</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111799"
      unitRef="usd">901</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111800"
      unitRef="usd">1556</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018798Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111801"
      unitRef="usd">449</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018798Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111802"
      unitRef="usd">629</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018798Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111803"
      unitRef="usd">824</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018798Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111804"
      unitRef="usd">1387</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018799Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111805"
      unitRef="usd">232</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018799Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111806"
      unitRef="usd">435</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018799Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111807"
      unitRef="usd">760</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018799Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111808"
      unitRef="usd">1572</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000194371Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111809"
      unitRef="usd">63</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000194371Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111810"
      unitRef="usd">216</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000194371Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111811"
      unitRef="usd">382</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000194371Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111812"
      unitRef="usd">863</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000079644Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111813"
      unitRef="usd">66</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000079644Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111814"
      unitRef="usd">234</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000079644Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111815"
      unitRef="usd">416</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000079644Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111816"
      unitRef="usd">943</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionByYearCaption
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111817">If you do not sell your shares:</oef:ExpenseExampleNoRedemptionByYearCaption>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Context_20260228_20260228_C000018799Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111818"
      unitRef="usd">132</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Context_20260228_20260228_C000018799Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111819"
      unitRef="usd">435</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Context_20260228_20260228_C000018799Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111820"
      unitRef="usd">760</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Context_20260228_20260228_C000018799Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111821"
      unitRef="usd">1572</oef:ExpenseExampleNoRedemptionYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111822">Portfolio 
Turnover</oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-49082">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities 
(or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs 
and may result in higher taxes when Fund shares are held &lt;/p&gt;

&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;in 
a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, 
affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate 
was 10.75% of the average value of its portfolio.&lt;/p&gt;</oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111823"
      unitRef="pure">0.1075</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111824">Principal Investment Strategies</oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-49105">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Under 
normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax. In addition, under 
normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest 
free from the personal income taxes, if any, of Connecticut. &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the Fund tries to invest all of 
its assets in tax-free securities, it is possible that up to 20% of the Fund's net assets may be in securities 
that pay interest that may be subject to the federal alternative minimum tax and in securities that pay 
interest subject to other federal or state income taxes.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund only buys municipal securities rated, 
at the time of purchase, in one of the top four ratings categories by one or more U.S. nationally recognized 
rating services (or unrated or short-term rated securities of comparable credit quality).&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund also may invest 
up to 35% of its total assets in municipal securities issued by U.S. territories.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund is a "non-diversified" 
fund, which means it generally invests a greater proportion of its assets in the securities of one or 
more issuers and invests overall in a smaller number of issuers than a diversified fund.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the investment 
manager will search for investments across a large number of municipal securities that finance different 
types of projects, from time to time, based on economic conditions, the Fund may have significant positions 
in municipal securities that finance similar types of projects.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The investment manager selects securities 
that it believes will provide the best balance between risk and return within the Fund&#x2019;s range 
of allowable investments and typically invests with a long-term time horizon. This means it generally 
holds securities in the Fund&#x2019;s portfolio for income purposes, although the investment manager may 
sell a security at any time if it believes it could help the Fund meet its goal. With a focus on income, 
individual securities are considered for purchase or sale based on various factors and considerations, 
including credit profile, risk, structure, pricing, portfolio impact, duration management, restructuring, 
opportunistic trading and tax loss harvesting opportunities. &lt;/p&gt;</oef:StrategyNarrativeTextBlock>
    <oef:StrategyPortfolioConcentration
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111825">Under 
normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax.</oef:StrategyPortfolioConcentration>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111826">Under 
normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax. In addition, under 
normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest 
free from the personal income taxes, if any, of Connecticut</fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111827">Under 
normal market conditions, the Fund invests at least 80% of its net assets in securities whose interest 
is free from federal income taxes, including the federal alternative minimum tax. In addition, under 
normal market conditions, the Fund invests at least 80% of its total assets in securities that pay interest 
free from the personal income taxes, if any, of Connecticut</fnd:NmRule35d1TermDfnSmryTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_PrincipalRisks2_S000006930Summary3Member"
      id="ixv-49131">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:13.0pt; font-family:Arial; text-align:left; color:#004C97; font-weight:normal; text-decoration:none;"&gt;Principal 
Risks&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;You 
could lose money by investing in the Fund. Mutual fund shares are not deposits or obligations of, or 
guaranteed or endorsed by, any bank, and are not insured by the Federal Deposit Insurance Corporation, 
the Federal Reserve Board, or any other agency of the U.S. government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_RiskLoseMoneyMember_S000006930Summary3Member"
      id="ixv-111830">You 
could lose money by investing in the Fund.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_RiskNotInsuredMember_S000006930Summary3Member"
      id="ixv-111831">Mutual fund shares are not deposits or obligations of, or 
guaranteed or endorsed by, any bank, and are not insured by the Federal Deposit Insurance Corporation, 
the Federal Reserve Board, or any other agency of the U.S. government.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_InterestRate2_S000006930Summary3Member"
      id="ixv-49134">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Interest 
Rate:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 When interest rates rise, debt security prices generally fall. The opposite is also generally true: 
debt security prices rise when interest rates fall. Interest rate changes are influenced by a number 
of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, 
and supply of and demand for bonds. In general, securities with longer maturities or durations are more 
sensitive to interest rate changes. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_Credit2_S000006930Summary3Member"
      id="ixv-49138">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Credit:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  An issuer of debt securities may fail 
to make interest payments or repay principal when due, in whole or in part. Changes in an issuer's financial 
strength or in a security's or government's credit rating may affect a security's value. A change in 
the credit rating of a municipal bond insurer that insures securities in the Fund&#x2019;s portfolio may 
affect the value of the securities it insures, the Fund&#x2019;s share price and Fund performance. The 
Fund might also be adversely impacted by the inability of an insurer to meet its insurance obligations.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_Liquidity2_S000006930Summary3Member"
      id="ixv-49142">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The trading market for a particular security or type of security or other investments in which the Fund 
invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the 
Fund&#x2019;s ability to sell such securities or other investments when necessary to meet the Fund&#x2019;s 
liquidity needs, which may arise or increase in response to a specific economic event or because the 
investment manager wishes to purchase particular investments or believes that a higher level of liquidity 
would be advantageous. Reduced liquidity will also generally lower the value of such securities or other 
investments. Market prices for such securities or other investments may be relatively volatile.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_TaxLegislativeandPoliticalChanges2_S000006930Summary3Member"
      id="ixv-49146">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax 
Legislative and Political Changes:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The municipal securities market could be significantly affected 
by adverse political and legislative changes or litigation at the federal or state level. The value of 
municipal bonds is closely tied to the benefits of tax-exempt income to investors. Significant revisions 
of federal income tax laws or regulations revising income tax rates or the tax-exempt character of municipal 
bonds, or even proposed changes and deliberations on this topic by the federal government, could cause 
municipal bond prices to fall. For example, lower federal income tax rates would reduce certain relative 
advantages of owning municipal bonds, and lower state income tax rates could have similar effects. In 
addition, the application of corporate minimum tax rates to financial statement income may have the effect 
of reducing demand for municipal bonds among corporate investors, which may in turn impact municipal 
bond prices.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_Tax-ExemptSecurities2_S000006930Summary3Member"
      id="ixv-49168">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax-Exempt 
Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Failure of a municipal security issuer to comply with applicable tax requirements 
may make income paid thereon taxable, resulting in a decline in the security&#x2019;s value. In addition, 
there could be changes in applicable tax laws or tax treatments that reduce or eliminate the current 
federal income tax exemption on municipal securities or otherwise adversely affect the current federal 
or state tax status of municipal securities.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_Market2_S000006930Summary3Member"
      id="ixv-49172">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Market:  &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The market values of 
securities or other investments owned by the Fund will go up or down, sometimes rapidly or unpredictably. 
The market value of a security or other investment may be reduced by market activity or other results 
of supply and demand unrelated to the issuer. This is a basic risk associated with all investments. When 
there are more sellers than buyers, prices tend to fall. Likewise, when there are more buyers than sellers, 
prices tend to rise. In addition, the value of the Fund&#x2019;s investments may go up or down due to 
general market or other conditions that are not specifically related to a particular issuer, such as: 
real or perceived adverse economic changes, including widespread liquidity issues and defaults in one 
or more industries; changes in interest, inflation or exchange rates; unexpected natural and man-made 
world events, such as diseases or disasters; financial, political or social disruptions, including terrorism 
and war; and U.S. trade disputes or other disputes with specific countries that could result in additional 
tariffs, trade barriers and/or investment restrictions in certain securities in those countries. Any 
of these conditions can adversely affect the economic prospects of many companies, sectors, nations, 
regions and the market in general, in ways that cannot necessarily be foreseen.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Ongoing or threatened 
armed conflicts throughout the world have caused and could continue to cause significant market disruptions 
and volatility. The hostilities and sanctions resulting from those hostilities could have a significant 
impact on certain investments of the Fund as well as the Fund&#x2019;s performance and liquidity.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_Connecticut2_S000006930Summary3Member"
      id="ixv-49177">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Connecticut:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund invests predominantly in Connecticut municipal securities. Therefore, events in Connecticut 
are likely to affect the Fund&#x2019;s investments and its performance. These events may include economic 
or political policy changes, tax base erosion, unfunded pension and healthcare liabilities, constitutional 
limits on tax increases, budget deficits and other financial difficulties, and changes in the credit 
ratings assigned to municipal issuers of Connecticut. The same is true of events in other states or U.S. 
territories, to the extent that the Fund has exposure to any other state or territory at any given time.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_Focus2_S000006930Summary3Member"
      id="ixv-49181">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Focus:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund may invest more than 25% of its assets in municipal securities that finance similar types of 
projects, such as utilities, hospitals, higher education and transportation. A change that affects one 
project, such as proposed legislation on the financing of the project, a shortage of the materials needed 
for the project, or a declining need for the project, would likely affect all similar projects, thereby 
increasing market risk.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_Income2_S000006930Summary3Member"
      id="ixv-49203">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Income:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund's distributions to shareholders may decline when prevailing interest rates fall, when the Fund 
experiences defaults on debt securities it holds or when the Fund realizes a loss upon the sale of a 
debt security. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_Prepayment2_S000006930Summary3Member"
      id="ixv-49207">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Prepayment:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Prepayment risk occurs when a debt security 
can be repaid in whole or in part prior to the security's maturity and the Fund must reinvest the proceeds 
it receives, during periods of declining interest rates, in securities that pay a lower rate of interest. 
Also, if a security has been purchased at a premium, the value of the premium would be lost in the event 
of prepayment. Prepayments generally increase when interest rates fall.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_Inflation2_S000006930Summary3Member"
      id="ixv-49211">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Inflation:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt; 
 &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The 
market price of debt securities generally falls as inflation increases because the purchasing power of 
the future income and repaid principal is expected to be worth less when received by the Fund. Debt securities 
that pay a fixed rather than variable interest rate are especially vulnerable to inflation risk because 
variable-rate debt securities may be able to participate, over the long term, in rising interest rates 
which have historically corresponded with long-term inflationary trends.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_BondInsurers2_S000006930Summary3Member"
      id="ixv-49216">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Bond Insurers:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Market conditions or changes to ratings criteria could adversely impact the ratings of municipal bond 
insurance companies. Downgrades and withdrawal of ratings from municipal bond insurers have substantially 
limited the availability of insurance sought by municipal bond issuers thereby reducing the supply of 
insured municipal securities.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because of the consolidation among municipal bond insurers 
the Fund is subject to additional risks including the risk that credit risk may be concentrated among 
fewer insurers and the risk that events involving one or more municipal bond insurers could have a significant 
adverse effect on the value of the securities insured by an insurer and on the municipal markets as a 
whole.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_UnratedDebtSecurities2_S000006930Summary3Member"
      id="ixv-49221">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Unrated 
Debt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Certain unrated debt securities determined by the investment manager to be of 
comparable credit quality to rated securities which the Fund may purchase may pay a higher interest rate 
than such rated debt securities and be subject to a greater risk of illiquidity or price changes. Less 
public information and independent credit analysis are typically available about unrated securities or 
issuers, and therefore they may be subject to greater risk of default.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_Non-Diversification2_S000006930Summary3Member"
      id="ixv-49225">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Non-Diversification:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Because the Fund is non-diversified, it may be more sensitive to economic, business, political or other 
changes affecting individual issuers or investments than a diversified fund, which may negatively impact 
the Fund's performance and result in greater fluctuation in the value of the Fund&#x2019;s shares.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_Management2_S000006930Summary3Member"
      id="ixv-49229">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Management:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund is subject to management risk because it is an actively managed investment portfolio. The Fund's 
investment manager applies investment &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;techniques 
and risk analyses in making investment decisions for the Fund, but there can be no guarantee that these 
decisions will produce the desired results.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_Cybersecurity2_S000006930Summary3Member"
      id="ixv-49253">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Cybersecurity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Cybersecurity incidents, 
both intentional and unintentional, may allow an unauthorized party to gain access to Fund assets, Fund 
or customer data (including private shareholder information), or proprietary information, cause the Fund, 
the investment manager, and/or their service providers (including, but not limited to, Fund accountants, 
custodians, sub-custodians, transfer agents and financial intermediaries) to suffer data breaches, data 
corruption or loss of operational functionality or prevent Fund investors from purchasing, redeeming 
or exchanging shares or receiving distributions. The investment manager has limited ability to prevent 
or mitigate cybersecurity incidents affecting third party service providers, and such third party service 
providers may have limited indemnification obligations to the Fund or the investment manager. Cybersecurity 
incidents may result in financial losses to the Fund and its shareholders, and substantial costs may 
be incurred in an effort to prevent or mitigate future cybersecurity incidents. Issuers of securities 
in which the Fund invests are also subject to cybersecurity risks, and the value of these securities 
could decline if the issuers experience cybersecurity incidents.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because technology is 
frequently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a 
chance that some risks have not been identified or prepared for, or that an attack may not be detected, 
which puts limitations on the Fund's ability to plan for or respond to a cyber attack. Like other funds 
and business enterprises, the Fund, the investment manager, and their service providers are subject to 
the risk of cyber incidents occurring from time to time.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111832">Performance</oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-49259">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future. You can obtain updated performance information 
at www.franklintempleton.com or by calling (800) DIAL BEN/342-5236.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.&lt;/p&gt;</oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111833">The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance.</oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111834">The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111835">franklintempleton.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:PerformanceAvailabilityPhone
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111836">(800) DIAL BEN/342-5236</oef:PerformanceAvailabilityPhone>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111837">Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.</oef:BarChartDoesNotReflectSalesLoads>
    <oef:BarChartHeading
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111838">Class A Annual Total Returns</oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-49283">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:17.33%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:68%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.67%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Best Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2023, Q4&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;8.77%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Worst Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2022, Q1&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;-6.80%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="2" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:100%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; font-size:1pt;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.17%.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</oef:BarChartClosingTextBlock>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      id="ixv-111839">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      id="ixv-111840">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111841"
      unitRef="pure">0.0877</oef:BarChartHighestQuarterlyReturn>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      id="ixv-111842">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      id="ixv-111843">2022-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111844"
      unitRef="pure">-0.0680</oef:BarChartLowestQuarterlyReturn>
    <oef:YearToDateReturnLabel
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      id="ixv-111845">As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.17%.</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturnDate
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      id="ixv-111846">2026-03-31</oef:BarChartYearToDateReturnDate>
    <oef:BarChartYearToDateReturn
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111847"
      unitRef="pure">-0.0017</oef:BarChartYearToDateReturn>
    <oef:PerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111848">Average Annual Total Returns (figures 
reflect sales charges) For periods ended December 31, 2025</oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      id="ixv-111849">Return before taxes</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111850"
      unitRef="pure">-0.0037</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111851"
      unitRef="pure">-0.0065</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111852"
      unitRef="pure">0.0094</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205909Member_S000006930Member_S000006930Summary3Member"
      id="ixv-111853">Return after taxes on 
distributions</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111854"
      unitRef="pure">-0.0038</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111855"
      unitRef="pure">-0.0068</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111856"
      unitRef="pure">0.0093</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205909Member_S000006930Member_S000006930Summary3Member"
      id="ixv-111857">Return after taxes on distributions and sale of Fund shares</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111858"
      unitRef="pure">0.0086</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111859"
      unitRef="pure">0.0003</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111860"
      unitRef="pure">0.0133</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018798Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111861"
      unitRef="pure">-0.0018</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018798Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111862"
      unitRef="pure">-0.0050</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018798Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111863"
      unitRef="pure">0.0104</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018799Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111864"
      unitRef="pure">0.0218</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018799Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111865"
      unitRef="pure">-0.0029</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018799Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111866"
      unitRef="pure">0.0086</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000194371Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111867"
      unitRef="pure">0.0380</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000194371Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111868"
      unitRef="pure">0.0040</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20170801_20251231_C000194371Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="_2408_"
      unitRef="pure">0.0156</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000079644Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111870"
      unitRef="pure">0.0389</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000079644Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111871"
      unitRef="pure">0.0038</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000079644Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111872"
      unitRef="pure">0.0154</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalBondIndex317_S000006930Member_S000006930Summary3Member"
      id="ixv-111873">Bloomberg Municipal Bond Index </oef:AverageAnnualReturnLabel>
    <oef:IndexNoDeductionForFeesExpensesTaxes
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-111874">(index reflects no deduction 
for fees, expenses or taxes)</oef:IndexNoDeductionForFeesExpensesTaxes>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalBondIndex317_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111875"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalBondIndex317_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111876"
      unitRef="pure">0.0080</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalBondIndex317_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-111877"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111878">Franklin 
Michigan Tax-Free Income Fund</oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111879">Investment Goal</oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-49663">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;To provide investors with 
as high a level of income exempt from federal income taxes as is consistent with prudent investment management 
and the preservation of shareholders&#x2019; capital. The Fund also tries to provide a maximum level of 
income exempt from personal income taxes, if any, for resident shareholders of Michigan.&lt;/p&gt;</oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111880">Fees and 
Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-49666">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;These tables describe the fees and expenses that you may pay if you buy, hold 
and sell shares of the Fund. &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;You may pay other fees (including on Class R6 and Advisor Class 
shares), such as brokerage commissions and other fees to financial intermediaries, which are not reflected 
in the tables and examples below.&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor. 
More information about these and other discounts is available from your financial professional and under 
&#x201c;Your Account&#x201d; on page 133 in the Fund&#x2019;s Prospectus and under &#x201c;Buying and Selling 
Shares&#x201d; on page 58 of the Fund&#x2019;s Statement of Additional Information. In addition, more information 
about sales charge discounts and waivers for purchases of shares through specific financial intermediaries 
is set forth in Appendix A &#x2013; &#x201c;Intermediary Sales Charge Discounts and Waivers&#x201d; to the 
Fund&#x2019;s prospectus.&lt;/span&gt;&lt;/p&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111881">You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor.</oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111882"
      unitRef="usd">100000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111883">Shareholder Fees</oef:ShareholderFeesCaption>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111884"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018771Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111885"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018773Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111886"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194360Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111887"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000068549Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111888"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="_2430_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018771Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="_2431_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018773Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111891"
      unitRef="pure">0.0100</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194360Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111892"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000068549Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111893"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:OperatingExpensesCaption
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111894">Annual 
Fund Operating Expenses (expenses that you pay each year as a percentage of the value 
of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111895"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018771Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111896"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018773Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111897"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000194360Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111898"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000068549Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111899"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111900"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018771Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111901"
      unitRef="pure">0.0010</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018773Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111902"
      unitRef="pure">0.0065</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000194360Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111903"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000068549Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111904"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111905"
      unitRef="pure">0.0010</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018771Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111906"
      unitRef="pure">0.0011</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018773Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111907"
      unitRef="pure">0.0010</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194360Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111908"
      unitRef="pure">0.0006</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000068549Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111909"
      unitRef="pure">0.0010</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111910"
      unitRef="pure">0.0084</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018771Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111911"
      unitRef="pure">0.0070</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018773Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111912"
      unitRef="pure">0.0124</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194360Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111913"
      unitRef="pure">0.0055</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000068549Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111914"
      unitRef="pure">0.0059</oef:ExpensesOverAssets>
    <oef:ExpenseExampleHeading
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111915">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-49942">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;This 
Example is intended to help you compare the cost of investing in the Fund with the cost of investing 
in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated 
and then redeem all of your shares at the end of the period. The Example also assumes that your investment 
has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual 
costs may be higher or lower, based on these assumptions your costs would be:&lt;/p&gt;</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111916"
      unitRef="usd">458</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111917"
      unitRef="usd">634</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111918"
      unitRef="usd">824</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111919"
      unitRef="usd">1373</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018771Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111920"
      unitRef="usd">444</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018771Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111921"
      unitRef="usd">591</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018771Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111922"
      unitRef="usd">750</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018771Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111923"
      unitRef="usd">1213</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018773Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111924"
      unitRef="usd">226</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018773Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111925"
      unitRef="usd">393</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018773Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111926"
      unitRef="usd">680</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018773Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111927"
      unitRef="usd">1389</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000194360Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111928"
      unitRef="usd">56</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000194360Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111929"
      unitRef="usd">176</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000194360Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111930"
      unitRef="usd">307</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000194360Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111931"
      unitRef="usd">689</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000068549Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111932"
      unitRef="usd">60</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000068549Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111933"
      unitRef="usd">189</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000068549Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111934"
      unitRef="usd">330</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000068549Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111935"
      unitRef="usd">739</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionByYearCaption
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111936">If you do not sell your shares:</oef:ExpenseExampleNoRedemptionByYearCaption>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Context_20260228_20260228_C000018773Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111937"
      unitRef="usd">126</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Context_20260228_20260228_C000018773Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111938"
      unitRef="usd">393</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Context_20260228_20260228_C000018773Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111939"
      unitRef="usd">680</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Context_20260228_20260228_C000018773Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111940"
      unitRef="usd">1389</oef:ExpenseExampleNoRedemptionYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111941">Portfolio 
Turnover</oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-50128">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities 
(or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs 
and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are 
not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During 
the most recent fiscal year, the Fund's portfolio turnover rate was 14.13% of the average value of its 
portfolio.&lt;/p&gt;</oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111942"
      unitRef="pure">0.1413</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111943">Principal Investment Strategies</oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-50131">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Michigan. &lt;/p&gt;
&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although 
the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the 
Fund's total assets may be in securities that pay interest that may be subject to the federal alternative 
minimum tax and in securities that pay interest subject to other federal or state income taxes.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories 
by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities 
of comparable credit quality).&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund also may invest up to 35% of its total assets in municipal securities 
issued by U.S. territories.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the investment manager will search for investments across a large number 
of municipal securities that finance different types of projects, from time to time, based on economic 
conditions, the Fund may have significant positions in municipal securities that finance similar types 
of projects.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
investment manager selects securities that it believes will provide the best balance between risk and 
return within the Fund&#x2019;s range of allowable investments and typically invests with a long-term 
time horizon. This means it generally holds securities in the Fund&#x2019;s portfolio for income purposes, 
although the investment manager may sell a security at any time if it believes it could help the Fund 
meet its goal. With a focus on income, individual securities are considered for purchase or sale based 
on various factors and considerations, including credit profile, risk, structure, pricing, portfolio 
impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities. 
&lt;/p&gt;</oef:StrategyNarrativeTextBlock>
    <oef:StrategyPortfolioConcentration
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111944">Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax.</oef:StrategyPortfolioConcentration>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111945">Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Michigan</fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111946">Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Michigan</fnd:NmRule35d1TermDfnSmryTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_PrincipalRisks2_S000006919Summary3Member"
      id="ixv-50157">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:13.0pt; font-family:Arial; text-align:left; color:#004C97; font-weight:normal; text-decoration:none;"&gt;Principal Risks&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;You could lose money by investing in the Fund. Mutual fund 
shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_RiskLoseMoneyMember_S000006919Summary3Member"
      id="ixv-111949">You could lose money by investing in the Fund.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_RiskNotInsuredMember_S000006919Summary3Member"
      id="ixv-111950">Mutual fund 
shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_InterestRate2_S000006919Summary3Member"
      id="ixv-50160">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Interest 
Rate:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 When interest rates rise, debt security prices generally fall. The opposite is also generally true: 
debt security prices rise when interest rates fall. Interest rate changes are influenced by a number 
of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, 
and supply of and demand for bonds. In general, securities with longer maturities or durations are more 
sensitive to interest rate changes. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_Credit2_S000006919Summary3Member"
      id="ixv-50164">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Credit:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  An issuer of debt securities may fail 
to make interest payments or repay principal when due, in whole or in part. Changes in an issuer's financial 
strength or in a security's or government's credit rating may affect a security's value. A change in 
the credit rating of a municipal bond insurer that insures securities in the Fund&#x2019;s portfolio may 
affect the value of the securities it insures, the Fund&#x2019;s share price and &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Fund 
performance. The Fund might also be adversely impacted by the inability of an insurer to meet its insurance 
obligations.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_Liquidity2_S000006919Summary3Member"
      id="ixv-50188">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The trading market for a particular security or type of security or other investments in which the Fund 
invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the 
Fund&#x2019;s ability to sell such securities or other investments when necessary to meet the Fund&#x2019;s 
liquidity needs, which may arise or increase in response to a specific economic event or because the 
investment manager wishes to purchase particular investments or believes that a higher level of liquidity 
would be advantageous. Reduced liquidity will also generally lower the value of such securities or other 
investments. Market prices for such securities or other investments may be relatively volatile.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_TaxLegislativeandPoliticalChanges2_S000006919Summary3Member"
      id="ixv-50192">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax 
Legislative and Political Changes:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The municipal securities market could be significantly affected 
by adverse political and legislative changes or litigation at the federal or state level. The value of 
municipal bonds is closely tied to the benefits of tax-exempt income to investors. Significant revisions 
of federal income tax laws or regulations revising income tax rates or the tax-exempt character of municipal 
bonds, or even proposed changes and deliberations on this topic by the federal government, could cause 
municipal bond prices to fall. For example, lower federal income tax rates would reduce certain relative 
advantages of owning municipal bonds, and lower state income tax rates could have similar effects. In 
addition, the application of corporate minimum tax rates to financial statement income may have the effect 
of reducing demand for municipal bonds among corporate investors, which may in turn impact municipal 
bond prices.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_Tax-ExemptSecurities2_S000006919Summary3Member"
      id="ixv-50196">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax-Exempt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Failure of a municipal security issuer 
to comply with applicable tax requirements may make income paid thereon taxable, resulting in a decline 
in the security&#x2019;s value. In addition, there could be changes in applicable tax laws or tax treatments 
that reduce or eliminate the current federal income tax exemption on municipal securities or otherwise 
adversely affect the current federal or state tax status of municipal securities.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_Market2_S000006919Summary3Member"
      id="ixv-50200">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Market: 
 &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The 
market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly 
or unpredictably. The market value of a security or other investment may be reduced by market activity 
or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all 
investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more 
buyers than sellers, prices tend to rise. In addition, the value of the Fund&#x2019;s investments may 
go up or down due to general market or other conditions that are not specifically related to a particular 
issuer, such as: real or perceived adverse economic changes, including widespread liquidity issues and 
defaults in one or more industries; changes in interest, inflation or exchange rates; unexpected natural 
and man-made world events, such as diseases or disasters; financial, political or social disruptions, 
including terrorism and war; and U.S. trade &lt;/span&gt;&lt;/p&gt;

&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;disputes 
or other disputes with specific countries that could result in additional tariffs, trade barriers and/or 
investment restrictions in certain securities in those countries. Any of these conditions can adversely 
affect the economic prospects of many companies, sectors, nations, regions and the market in general, 
in ways that cannot necessarily be foreseen.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Ongoing or threatened armed conflicts throughout the world 
have caused and could continue to cause significant market disruptions and volatility. The hostilities 
and sanctions resulting from those hostilities could have a significant impact on certain investments 
of the Fund as well as the Fund&#x2019;s performance and liquidity.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_Michigan2_S000006919Summary3Member"
      id="ixv-50225">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Michigan:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund invests predominantly in Michigan municipal securities. Therefore, events in Michigan are likely 
to affect the Fund&#x2019;s investments and its performance. These events may include economic or political 
policy changes, tax base erosion, unfunded pension and healthcare liabilities, constitutional limits 
on tax increases, budget deficits and other financial difficulties, and changes in the credit ratings 
assigned to municipal issuers of Michigan. The same is true of events in other states or U.S. territories, 
to the extent that the Fund has exposure to any other state or territory at any given time.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_Focus2_S000006919Summary3Member"
      id="ixv-50229">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Focus:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund may invest more than 25% of its assets in municipal securities that finance similar types of 
projects, such as utilities, hospitals, higher education and transportation. A change that affects one 
project, such as proposed legislation on the financing of the project, a shortage of the materials needed 
for the project, or a declining need for the project, would likely affect all similar projects, thereby 
increasing market risk.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_Income2_S000006919Summary3Member"
      id="ixv-50233">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Income:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund's distributions to shareholders 
may decline when prevailing interest rates fall, when the Fund experiences defaults on debt securities 
it holds or when the Fund realizes a loss upon the sale of a debt security. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_Prepayment2_S000006919Summary3Member"
      id="ixv-50237">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Prepayment:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Prepayment risk occurs when a debt security can be repaid in whole or in part prior to the security's 
maturity and the Fund must reinvest the proceeds it receives, during periods of declining interest rates, 
in securities that pay a lower rate of interest. Also, if a security has been purchased at a premium, 
the value of the premium would be lost in the event of prepayment. Prepayments generally increase when 
interest rates fall.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_Inflation2_S000006919Summary3Member"
      id="ixv-50241">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Inflation:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;  &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The market price of debt securities generally 
falls as inflation increases because the purchasing power of the future income and repaid principal is 
expected to be worth less when received by the Fund. Debt securities that pay a fixed rather than variable 
interest rate are especially vulnerable to inflation risk because variable-rate debt securities may be 
able to participate, over the long term, in rising interest rates which have historically corresponded 
with long-term inflationary trends.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_BondInsurers2_S000006919Summary3Member"
      id="ixv-50264">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Bond 
Insurers:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Market conditions or changes to ratings criteria could adversely impact the 
ratings of municipal bond insurance companies. Downgrades and withdrawal of ratings from municipal bond 
insurers have substantially limited the availability of insurance sought by municipal bond issuers thereby 
reducing the supply of insured municipal securities.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because of the consolidation among municipal 
bond insurers the Fund is subject to additional risks including the risk that credit risk may be concentrated 
among fewer insurers and the risk that events involving one or more municipal bond insurers could have 
a significant adverse effect on the value of the securities insured by an insurer and on the municipal 
markets as a whole.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_UnratedDebtSecurities2_S000006919Summary3Member"
      id="ixv-50269">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Unrated Debt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Certain unrated debt 
securities determined by the investment manager to be of comparable credit quality to rated securities 
which the Fund may purchase may pay a higher interest rate than such rated debt securities and be subject 
to a greater risk of illiquidity or price changes. Less public information and independent credit analysis 
are typically available about unrated securities or issuers, and therefore they may be subject to greater 
risk of default.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_Management2_S000006919Summary3Member"
      id="ixv-50273">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Management:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund is subject to management risk 
because it is an actively managed investment portfolio. The Fund's investment manager applies investment 
techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee 
that these decisions will produce the desired results.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_Cybersecurity2_S000006919Summary3Member"
      id="ixv-50277">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Cybersecurity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain 
access to Fund assets, Fund or customer data (including private shareholder information), or proprietary 
information, cause the Fund, the investment manager, and/or their service providers (including, but not 
limited to, Fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) 
to suffer data breaches, data corruption or loss of operational functionality or prevent Fund investors 
from purchasing, redeeming or exchanging shares or receiving distributions. The investment manager has 
limited ability to prevent or mitigate cybersecurity incidents affecting third party service providers, 
and such third party service providers may have limited indemnification obligations to the Fund or the 
investment manager. Cybersecurity incidents may result in financial losses to the Fund and its shareholders, 
and substantial costs may be incurred in an effort to prevent or mitigate future cybersecurity incidents. 
Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value 
of these securities could decline if the issuers experience cybersecurity incidents.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because technology is 
frequently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a 
chance that some risks have not been identified or prepared for, or that an attack may not be detected, 
which puts limitations on the Fund's ability to plan for or respond to a cyber attack. Like other &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;funds 
and business enterprises, the Fund, the investment manager, and their service providers are subject to 
the risk of cyber incidents occurring from time to time.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111951">Performance</oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-50303">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future. You can obtain updated performance information 
at www.franklintempleton.com or by calling (800) DIAL BEN/342-5236.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.&lt;/p&gt;</oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111952">The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance.</oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111953">The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111954">franklintempleton.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:PerformanceAvailabilityPhone
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111955">(800) DIAL BEN/342-5236</oef:PerformanceAvailabilityPhone>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111956">Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.</oef:BarChartDoesNotReflectSalesLoads>
    <oef:BarChartHeading
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111957">Class 
A Annual Total Returns</oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-50309">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:17.33%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:68%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.67%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Best Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2023, Q4&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;7.37%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Worst Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2022, Q1&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;-6.39%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="2" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:100%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; font-size:1pt;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.25%.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
</oef:BarChartClosingTextBlock>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member"
      id="ixv-111958">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member"
      id="ixv-111959">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111960"
      unitRef="pure">0.0737</oef:BarChartHighestQuarterlyReturn>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member"
      id="ixv-111961">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member"
      id="ixv-111962">2022-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111963"
      unitRef="pure">-0.0639</oef:BarChartLowestQuarterlyReturn>
    <oef:YearToDateReturnLabel
      contextRef="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member"
      id="ixv-111964">As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.25%.</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturnDate
      contextRef="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member"
      id="ixv-111965">2026-03-31</oef:BarChartYearToDateReturnDate>
    <oef:BarChartYearToDateReturn
      contextRef="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111966"
      unitRef="pure">-0.0025</oef:BarChartYearToDateReturn>
    <oef:PerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111967">Average 
Annual Total Returns (figures reflect sales charges) For periods ended December 
31, 2025</oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_C000205898Member_S000006919Member_S000006919Summary3Member"
      id="ixv-111968">Return before taxes</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111969"
      unitRef="pure">-0.0077</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111970"
      unitRef="pure">-0.0075</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111971"
      unitRef="pure">0.0136</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205898Member_S000006919Member_S000006919Summary3Member"
      id="ixv-111972">Return after taxes on 
distributions</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111973"
      unitRef="pure">-0.0078</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111974"
      unitRef="pure">-0.0076</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111975"
      unitRef="pure">0.0135</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205898Member_S000006919Member_S000006919Summary3Member"
      id="ixv-111976">Return after taxes on distributions and sale of Fund shares</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111977"
      unitRef="pure">0.0077</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111978"
      unitRef="pure">0.0003</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111979"
      unitRef="pure">0.0168</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018771Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111980"
      unitRef="pure">-0.0064</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018771Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111981"
      unitRef="pure">-0.0061</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018771Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111982"
      unitRef="pure">0.0145</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018773Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111983"
      unitRef="pure">0.0154</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018773Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111984"
      unitRef="pure">-0.0045</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018773Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111985"
      unitRef="pure">0.0124</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000194360Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111986"
      unitRef="pure">0.0329</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000194360Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111987"
      unitRef="pure">0.0028</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20170801_20251231_C000194360Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="_2563_"
      unitRef="pure">0.0192</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000068549Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111989"
      unitRef="pure">0.0335</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000068549Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111990"
      unitRef="pure">0.0026</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000068549Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111991"
      unitRef="pure">0.0193</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalBondIndex318_S000006919Member_S000006919Summary3Member"
      id="ixv-111992">Bloomberg Municipal Bond 
Index </oef:AverageAnnualReturnLabel>
    <oef:IndexNoDeductionForFeesExpensesTaxes
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-111993">(index reflects no deduction for fees, expenses or taxes)</oef:IndexNoDeductionForFeesExpensesTaxes>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalBondIndex318_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111994"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalBondIndex318_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111995"
      unitRef="pure">0.0080</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalBondIndex318_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-111996"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-111997">Franklin 
Minnesota Tax-Free Income Fund</oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-111998">Investment Goal</oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-50686">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;To provide investors with 
as high a level of income exempt from federal income taxes as is consistent with prudent investment management 
and the preservation of shareholders&#x2019; capital. The Fund also tries to provide a maximum level of 
income exempt from personal income taxes, if any, for resident shareholders of Minnesota.&lt;/p&gt;</oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-111999">Fees and 
Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-50689">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;These tables describe the fees and expenses that you may pay if you buy, hold 
and sell shares of the Fund. &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;You may pay other fees (including on Class R6 and Advisor Class 
shares), such as brokerage commissions and other fees to financial intermediaries, which are not reflected 
in the tables and examples below.&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor. 
More information about these and other discounts is available from your financial professional and under 
&#x201c;Your Account&#x201d; on page 133 in the Fund&#x2019;s Prospectus and under &#x201c;Buying and Selling 
Shares&#x201d; on page 58 of the Fund&#x2019;s Statement of Additional Information. In addition, more information 
about sales charge discounts and waivers for purchases of shares through specific financial intermediaries 
is set forth in Appendix A &#x2013; &#x201c;Intermediary Sales Charge Discounts and Waivers&#x201d; to the 
Fund&#x2019;s prospectus.&lt;/span&gt;&lt;/p&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112000">You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor.</oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112001"
      unitRef="usd">100000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112002">Shareholder Fees</oef:ShareholderFeesCaption>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112003"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018774Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112004"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018775Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112005"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194361Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112006"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000079637Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112007"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="_2585_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018774Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="_2586_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018775Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112010"
      unitRef="pure">0.0100</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194361Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112011"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000079637Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112012"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:OperatingExpensesCaption
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112013">Annual 
Fund Operating Expenses (expenses that you pay each year as a percentage of the value 
of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112014"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018774Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112015"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018775Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112016"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000194361Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112017"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000079637Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112018"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112019"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018774Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112020"
      unitRef="pure">0.0010</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018775Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112021"
      unitRef="pure">0.0065</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000194361Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112022"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000079637Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112023"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112024"
      unitRef="pure">0.0011</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018774Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112025"
      unitRef="pure">0.0011</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018775Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112026"
      unitRef="pure">0.0011</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194361Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112027"
      unitRef="pure">0.0006</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079637Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112028"
      unitRef="pure">0.0011</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112029"
      unitRef="pure">0.0085</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018774Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112030"
      unitRef="pure">0.0070</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018775Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112031"
      unitRef="pure">0.0125</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194361Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112032"
      unitRef="pure">0.0055</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079637Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112033"
      unitRef="pure">0.0060</oef:ExpensesOverAssets>
    <oef:ExpenseExampleHeading
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112034">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-50965">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;This 
Example is intended to help you compare the cost of investing in the Fund with the cost of investing 
in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated 
and then redeem all of your shares at the end of the period. The Example also assumes that your investment 
has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual 
costs may be higher or lower, based on these assumptions your costs would be:&lt;/p&gt;</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112035"
      unitRef="usd">459</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112036"
      unitRef="usd">637</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112037"
      unitRef="usd">829</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112038"
      unitRef="usd">1385</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018774Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112039"
      unitRef="usd">444</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018774Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112040"
      unitRef="usd">591</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018774Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112041"
      unitRef="usd">750</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018774Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112042"
      unitRef="usd">1213</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018775Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112043"
      unitRef="usd">227</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018775Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112044"
      unitRef="usd">396</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018775Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112045"
      unitRef="usd">686</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018775Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112046"
      unitRef="usd">1400</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000194361Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112047"
      unitRef="usd">56</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000194361Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112048"
      unitRef="usd">176</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000194361Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112049"
      unitRef="usd">307</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000194361Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112050"
      unitRef="usd">689</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000079637Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112051"
      unitRef="usd">61</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000079637Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112052"
      unitRef="usd">192</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000079637Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112053"
      unitRef="usd">335</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000079637Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112054"
      unitRef="usd">750</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionByYearCaption
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112055">If you do not sell your shares:</oef:ExpenseExampleNoRedemptionByYearCaption>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Context_20260228_20260228_C000018775Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112056"
      unitRef="usd">127</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Context_20260228_20260228_C000018775Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112057"
      unitRef="usd">396</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Context_20260228_20260228_C000018775Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112058"
      unitRef="usd">686</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Context_20260228_20260228_C000018775Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112059"
      unitRef="usd">1400</oef:ExpenseExampleNoRedemptionYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112060">Portfolio 
Turnover</oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-51151">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities 
(or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs 
and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are 
not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During 
the most recent fiscal year, the Fund's portfolio turnover rate was 5.26% of the average value of its 
portfolio.&lt;/p&gt;</oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112061"
      unitRef="pure">0.0526</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112062">Principal Investment Strategies</oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-51154">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Minnesota. &lt;/p&gt;
&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although 
the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the 
Fund's total assets may be in securities that pay interest that may be subject to the federal alternative 
minimum tax and in securities that pay interest subject to other federal or state income taxes.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories 
by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities 
of comparable credit quality).&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund also may invest up to 35% of its total assets in municipal securities 
issued by U.S. territories.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the investment manager will search for investments across a large number 
of municipal securities that finance different types of projects, from time to time, based on economic 
conditions, the Fund may have significant positions in municipal securities that finance similar types 
of projects.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
investment manager selects securities that it believes will provide the best balance between risk and 
return within the Fund&#x2019;s range of allowable investments and typically invests with a long-term 
time horizon. This means it generally holds securities in the Fund&#x2019;s portfolio for income purposes, 
although the investment manager may sell a security at any time if it believes it could help the Fund 
meet its goal. With a focus on income, individual securities are considered for purchase or sale based 
on various factors and considerations, including credit profile, risk, structure, pricing, portfolio 
impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities. 
&lt;/p&gt;</oef:StrategyNarrativeTextBlock>
    <oef:StrategyPortfolioConcentration
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112063">Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax.</oef:StrategyPortfolioConcentration>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112064">Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Minnesota</fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112065">Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Minnesota</fnd:NmRule35d1TermDfnSmryTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_PrincipalRisks2_S000006920Summary3Member"
      id="ixv-51180">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:13.0pt; font-family:Arial; text-align:left; color:#004C97; font-weight:normal; text-decoration:none;"&gt;Principal Risks&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;You could lose money by investing in the Fund. Mutual fund 
shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_RiskLoseMoneyMember_S000006920Summary3Member"
      id="ixv-112068">You could lose money by investing in the Fund.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_RiskNotInsuredMember_S000006920Summary3Member"
      id="ixv-112069">Mutual fund 
shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_InterestRate2_S000006920Summary3Member"
      id="ixv-51183">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Interest 
Rate:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 When interest rates rise, debt security prices generally fall. The opposite is also generally true: 
debt security prices rise when interest rates fall. Interest rate changes are influenced by a number 
of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, 
and supply of and demand for bonds. In general, securities with longer maturities or durations are more 
sensitive to interest rate changes. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_Credit2_S000006920Summary3Member"
      id="ixv-51187">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Credit:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  An issuer of debt securities may fail 
to make interest payments or repay principal when due, in whole or in part. Changes in an issuer's financial 
strength or in a security's or government's credit rating may affect a security's value. A change in 
the credit rating of a municipal bond insurer that insures securities in the Fund&#x2019;s portfolio may 
affect the value of the securities it insures, the Fund&#x2019;s share price and &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Fund 
performance. The Fund might also be adversely impacted by the inability of an insurer to meet its insurance 
obligations.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_Liquidity2_S000006920Summary3Member"
      id="ixv-51211">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The trading market for a particular security or type of security or other investments in which the Fund 
invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the 
Fund&#x2019;s ability to sell such securities or other investments when necessary to meet the Fund&#x2019;s 
liquidity needs, which may arise or increase in response to a specific economic event or because the 
investment manager wishes to purchase particular investments or believes that a higher level of liquidity 
would be advantageous. Reduced liquidity will also generally lower the value of such securities or other 
investments. Market prices for such securities or other investments may be relatively volatile.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_TaxLegislativeandPoliticalChanges2_S000006920Summary3Member"
      id="ixv-51215">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax 
Legislative and Political Changes:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The municipal securities market could be significantly affected 
by adverse political and legislative changes or litigation at the federal or state level. The value of 
municipal bonds is closely tied to the benefits of tax-exempt income to investors. Significant revisions 
of federal income tax laws or regulations revising income tax rates or the tax-exempt character of municipal 
bonds, or even proposed changes and deliberations on this topic by the federal government, could cause 
municipal bond prices to fall. For example, lower federal income tax rates would reduce certain relative 
advantages of owning municipal bonds, and lower state income tax rates could have similar effects. In 
addition, the application of corporate minimum tax rates to financial statement income may have the effect 
of reducing demand for municipal bonds among corporate investors, which may in turn impact municipal 
bond prices.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_Tax-ExemptSecurities2_S000006920Summary3Member"
      id="ixv-51219">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax-Exempt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Failure of a municipal security issuer 
to comply with applicable tax requirements may make income paid thereon taxable, resulting in a decline 
in the security&#x2019;s value. In addition, there could be changes in applicable tax laws or tax treatments 
that reduce or eliminate the current federal income tax exemption on municipal securities or otherwise 
adversely affect the current federal or state tax status of municipal securities.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_Market2_S000006920Summary3Member"
      id="ixv-51223">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Market: 
 &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The 
market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly 
or unpredictably. The market value of a security or other investment may be reduced by market activity 
or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all 
investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more 
buyers than sellers, prices tend to rise. In addition, the value of the Fund&#x2019;s investments may 
go up or down due to general market or other conditions that are not specifically related to a particular 
issuer, such as: real or perceived adverse economic changes, including widespread liquidity issues and 
defaults in one or more industries; changes in interest, inflation or exchange rates; unexpected natural 
and man-made world events, such as diseases or disasters; financial, political or social disruptions, 
including terrorism and war; and U.S. trade &lt;/span&gt;&lt;/p&gt;

&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;disputes 
or other disputes with specific countries that could result in additional tariffs, trade barriers and/or 
investment restrictions in certain securities in those countries. Any of these conditions can adversely 
affect the economic prospects of many companies, sectors, nations, regions and the market in general, 
in ways that cannot necessarily be foreseen.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Ongoing or threatened armed conflicts throughout the world 
have caused and could continue to cause significant market disruptions and volatility. The hostilities 
and sanctions resulting from those hostilities could have a significant impact on certain investments 
of the Fund as well as the Fund&#x2019;s performance and liquidity.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_Minnesota2_S000006920Summary3Member"
      id="ixv-51248">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Minnesota:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund invests predominantly in Minnesota municipal securities. Therefore, events in Minnesota are 
likely to affect the Fund&#x2019;s investments and its performance. These events may include economic 
or political policy changes, tax base erosion, unfunded pension and healthcare liabilities, constitutional 
limits on tax increases, budget deficits and other financial difficulties, and changes in the credit 
ratings assigned to municipal issuers of Minnesota. The same is true of events in other states or U.S. 
territories, to the extent that the Fund has exposure to any other state or territory at any given time.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_Focus2_S000006920Summary3Member"
      id="ixv-51252">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Focus:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund may invest more than 25% of its assets in municipal securities that finance similar types of 
projects, such as utilities, hospitals, higher education and transportation. A change that affects one 
project, such as proposed legislation on the financing of the project, a shortage of the materials needed 
for the project, or a declining need for the project, would likely affect all similar projects, thereby 
increasing market risk.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_Income2_S000006920Summary3Member"
      id="ixv-51256">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Income:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund's distributions to shareholders 
may decline when prevailing interest rates fall, when the Fund experiences defaults on debt securities 
it holds or when the Fund realizes a loss upon the sale of a debt security. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_Prepayment2_S000006920Summary3Member"
      id="ixv-51260">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Prepayment:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Prepayment risk occurs when a debt security can be repaid in whole or in part prior to the security's 
maturity and the Fund must reinvest the proceeds it receives, during periods of declining interest rates, 
in securities that pay a lower rate of interest. Also, if a security has been purchased at a premium, 
the value of the premium would be lost in the event of prepayment. Prepayments generally increase when 
interest rates fall.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_Inflation2_S000006920Summary3Member"
      id="ixv-51264">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Inflation:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;  &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The market price of debt securities generally 
falls as inflation increases because the purchasing power of the future income and repaid principal is 
expected to be worth less when received by the Fund. Debt securities that pay a fixed rather than variable 
interest rate are especially vulnerable to inflation risk because variable-rate debt securities may be 
able to participate, over the long term, in rising interest rates which have historically corresponded 
with long-term inflationary trends.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_BondInsurers2_S000006920Summary3Member"
      id="ixv-51287">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Bond 
Insurers:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Market conditions or changes to ratings criteria could adversely impact the 
ratings of municipal bond insurance companies. Downgrades and withdrawal of ratings from municipal bond 
insurers have substantially limited the availability of insurance sought by municipal bond issuers thereby 
reducing the supply of insured municipal securities.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because of the consolidation among municipal 
bond insurers the Fund is subject to additional risks including the risk that credit risk may be concentrated 
among fewer insurers and the risk that events involving one or more municipal bond insurers could have 
a significant adverse effect on the value of the securities insured by an insurer and on the municipal 
markets as a whole.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_UnratedDebtSecurities2_S000006920Summary3Member"
      id="ixv-51292">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Unrated Debt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Certain unrated debt 
securities determined by the investment manager to be of comparable credit quality to rated securities 
which the Fund may purchase may pay a higher interest rate than such rated debt securities and be subject 
to a greater risk of illiquidity or price changes. Less public information and independent credit analysis 
are typically available about unrated securities or issuers, and therefore they may be subject to greater 
risk of default.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_Management2_S000006920Summary3Member"
      id="ixv-51296">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Management:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund is subject to management risk 
because it is an actively managed investment portfolio. The Fund's investment manager applies investment 
techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee 
that these decisions will produce the desired results.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_Cybersecurity2_S000006920Summary3Member"
      id="ixv-51300">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Cybersecurity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain 
access to Fund assets, Fund or customer data (including private shareholder information), or proprietary 
information, cause the Fund, the investment manager, and/or their service providers (including, but not 
limited to, Fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) 
to suffer data breaches, data corruption or loss of operational functionality or prevent Fund investors 
from purchasing, redeeming or exchanging shares or receiving distributions. The investment manager has 
limited ability to prevent or mitigate cybersecurity incidents affecting third party service providers, 
and such third party service providers may have limited indemnification obligations to the Fund or the 
investment manager. Cybersecurity incidents may result in financial losses to the Fund and its shareholders, 
and substantial costs may be incurred in an effort to prevent or mitigate future cybersecurity incidents. 
Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value 
of these securities could decline if the issuers experience cybersecurity incidents.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because technology is 
frequently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a 
chance that some risks have not been identified or prepared for, or that an attack may not be detected, 
which puts limitations on the Fund's ability to plan for or respond to a cyber attack. Like other &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;funds 
and business enterprises, the Fund, the investment manager, and their service providers are subject to 
the risk of cyber incidents occurring from time to time.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112070">Performance</oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-51326">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future. You can obtain updated performance information 
at www.franklintempleton.com or by calling (800) DIAL BEN/342-5236.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.&lt;/p&gt;</oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112071">The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance.</oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112072">The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112073">franklintempleton.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:PerformanceAvailabilityPhone
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112074">(800) DIAL BEN/342-5236</oef:PerformanceAvailabilityPhone>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112075">Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.</oef:BarChartDoesNotReflectSalesLoads>
    <oef:BarChartHeading
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112076">Class 
A Annual Total Returns</oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-51332">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:17.33%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:68%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.67%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Best Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2023, Q4&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;9.09%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Worst Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2022, Q1&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;-6.74%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="2" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:100%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; font-size:1pt;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.59%.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
</oef:BarChartClosingTextBlock>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member"
      id="ixv-112077">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member"
      id="ixv-112078">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112079"
      unitRef="pure">0.0909</oef:BarChartHighestQuarterlyReturn>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member"
      id="ixv-112080">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member"
      id="ixv-112081">2022-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112082"
      unitRef="pure">-0.0674</oef:BarChartLowestQuarterlyReturn>
    <oef:YearToDateReturnLabel
      contextRef="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member"
      id="ixv-112083">As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.59%.</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturnDate
      contextRef="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member"
      id="ixv-112084">2026-03-31</oef:BarChartYearToDateReturnDate>
    <oef:BarChartYearToDateReturn
      contextRef="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112085"
      unitRef="pure">-0.0059</oef:BarChartYearToDateReturn>
    <oef:PerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112086">Average 
Annual Total Returns (figures reflect sales charges) For periods ended December 
31, 2025</oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_C000205899Member_S000006920Member_S000006920Summary3Member"
      id="ixv-112087">Return before taxes</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112088"
      unitRef="pure">0.0024</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112089"
      unitRef="pure">-0.0081</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112090"
      unitRef="pure">0.0116</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205899Member_S000006920Member_S000006920Summary3Member"
      id="ixv-112091">Return after taxes on 
distributions</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112092"
      unitRef="pure">0.0024</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112093"
      unitRef="pure">-0.0082</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112094"
      unitRef="pure">0.0116</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205899Member_S000006920Member_S000006920Summary3Member"
      id="ixv-112095">Return after taxes on distributions and sale of Fund shares</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112096"
      unitRef="pure">0.0136</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112097"
      unitRef="pure">-0.0006</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112098"
      unitRef="pure">0.0148</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018774Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112099"
      unitRef="pure">0.0052</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018774Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112100"
      unitRef="pure">-0.0066</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018774Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112101"
      unitRef="pure">0.0127</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018775Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112102"
      unitRef="pure">0.0277</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018775Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112103"
      unitRef="pure">-0.0048</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018775Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112104"
      unitRef="pure">0.0109</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000194361Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112105"
      unitRef="pure">0.0454</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000194361Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112106"
      unitRef="pure">0.0025</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20170801_20251231_C000194361Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="_2718_"
      unitRef="pure">0.0173</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000079637Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112108"
      unitRef="pure">0.0450</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000079637Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112109"
      unitRef="pure">0.0022</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000079637Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112110"
      unitRef="pure">0.0177</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalBondIndex319_S000006920Member_S000006920Summary3Member"
      id="ixv-112111">Bloomberg Municipal Bond Index </oef:AverageAnnualReturnLabel>
    <oef:IndexNoDeductionForFeesExpensesTaxes
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112112">(index reflects no deduction 
for fees, expenses or taxes)</oef:IndexNoDeductionForFeesExpensesTaxes>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalBondIndex319_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112113"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalBondIndex319_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112114"
      unitRef="pure">0.0080</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalBondIndex319_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-112115"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112116">Franklin 
Ohio Tax-Free Income Fund</oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112117">Investment Goal</oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-51709">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;To provide investors with as high a level 
of income exempt from federal income taxes as is consistent with prudent investment management and the 
preservation of shareholders&#x2019; capital. The Fund also tries to provide a maximum level of income 
exempt from personal income taxes, if any, for resident shareholders of Ohio.&lt;/p&gt;</oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112118">Fees and 
Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-51712">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;These tables describe the fees and expenses that you may pay if you buy, hold 
and sell shares of the Fund. &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;You may pay other fees (including on Class R6 and Advisor Class 
shares), such as brokerage commissions and other fees to financial intermediaries, which are not reflected 
in the tables and examples below.&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor. 
More information about these and other discounts is available from your financial professional and under 
&#x201c;Your Account&#x201d; on page 133 in the Fund&#x2019;s Prospectus and under &#x201c;Buying and Selling 
Shares&#x201d; on page 58 of the Fund&#x2019;s Statement of Additional Information. In addition, more information 
about sales charge discounts and waivers for purchases of shares through specific financial intermediaries 
is set forth in Appendix A &#x2013; &#x201c;Intermediary Sales Charge Discounts and Waivers&#x201d; to the 
Fund&#x2019;s prospectus.&lt;/span&gt;&lt;/p&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112119">You may qualify for sales charge discounts in Class A if 
you and your family invest, or agree to invest in the future, at least $100,000 in Franklin Templeton 
funds and certain other funds distributed through Franklin Distributors, LLC, the Fund&#x2019;s distributor.</oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112120"
      unitRef="usd">100000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112121">Shareholder Fees</oef:ShareholderFeesCaption>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112122"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018786Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112123"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018788Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112124"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194366Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112125"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000068552Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112126"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="_2740_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018786Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="_2741_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018788Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112129"
      unitRef="pure">0.0100</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194366Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112130"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000068552Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112131"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:OperatingExpensesCaption
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112132">Annual 
Fund Operating Expenses (expenses that you pay each year as a percentage of the value 
of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112133"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018786Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112134"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018788Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112135"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000194366Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112136"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000068552Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112137"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112138"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018786Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112139"
      unitRef="pure">0.0010</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018788Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112140"
      unitRef="pure">0.0065</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000194366Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112141"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000068552Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112142"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112143"
      unitRef="pure">0.0009</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018786Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112144"
      unitRef="pure">0.0009</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018788Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112145"
      unitRef="pure">0.0009</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194366Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112146"
      unitRef="pure">0.0006</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000068552Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112147"
      unitRef="pure">0.0009</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112148"
      unitRef="pure">0.0082</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018786Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112149"
      unitRef="pure">0.0067</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018788Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112150"
      unitRef="pure">0.0122</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194366Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112151"
      unitRef="pure">0.0054</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000068552Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112152"
      unitRef="pure">0.0057</oef:ExpensesOverAssets>
    <oef:ExpenseExampleHeading
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112153">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-51988">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;This 
Example is intended to help you compare the cost of investing in the Fund with the cost of investing 
in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated 
and then redeem all of your shares at the end of the period. The Example also assumes that your investment 
has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual 
costs may be higher or lower, based on these assumptions your costs would be:&lt;/p&gt;</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112154"
      unitRef="usd">456</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112155"
      unitRef="usd">627</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112156"
      unitRef="usd">813</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112157"
      unitRef="usd">1350</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018786Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112158"
      unitRef="usd">441</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018786Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112159"
      unitRef="usd">582</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018786Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112160"
      unitRef="usd">735</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018786Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112161"
      unitRef="usd">1178</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018788Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112162"
      unitRef="usd">224</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018788Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112163"
      unitRef="usd">387</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018788Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112164"
      unitRef="usd">670</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018788Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112165"
      unitRef="usd">1366</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000194366Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112166"
      unitRef="usd">55</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000194366Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112167"
      unitRef="usd">173</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000194366Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112168"
      unitRef="usd">302</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000194366Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112169"
      unitRef="usd">678</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000068552Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112170"
      unitRef="usd">58</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000068552Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112171"
      unitRef="usd">183</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000068552Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112172"
      unitRef="usd">318</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000068552Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112173"
      unitRef="usd">713</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionByYearCaption
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112174">If you do not sell your shares:</oef:ExpenseExampleNoRedemptionByYearCaption>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Context_20260228_20260228_C000018788Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112175"
      unitRef="usd">124</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Context_20260228_20260228_C000018788Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112176"
      unitRef="usd">387</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Context_20260228_20260228_C000018788Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112177"
      unitRef="usd">670</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Context_20260228_20260228_C000018788Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112178"
      unitRef="usd">1366</oef:ExpenseExampleNoRedemptionYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112179">Portfolio 
Turnover</oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-52174">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities 
(or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs 
and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are 
not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During 
the most recent fiscal year, the Fund's portfolio turnover rate was 10.45% of the average value of its 
portfolio.&lt;/p&gt;</oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112180"
      unitRef="pure">0.1045</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112181">Principal Investment Strategies</oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-52177">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Ohio. &lt;/p&gt;
&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although 
the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the 
Fund's total assets may be in securities that pay interest that may be subject to the federal alternative 
minimum tax and in securities that pay interest subject to other federal or state income taxes.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories 
by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities 
of comparable credit quality).&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund also may invest up to 35% of its total assets in municipal securities 
issued by U.S. territories.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the investment manager will search for investments across a large number 
of municipal securities that finance different types of projects, from time to time, based on economic 
conditions, the Fund may have significant positions in municipal securities that finance similar types 
of projects.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
investment manager selects securities that it believes will provide the best balance between risk and 
return within the Fund&#x2019;s range of allowable investments and typically invests with a long-term 
time horizon. This means it generally holds securities in the Fund&#x2019;s portfolio for income purposes, 
although the investment manager may sell a security at any time if it believes it could help the Fund 
meet its goal. With a focus on income, individual securities are considered for purchase or sale based 
on various factors and considerations, including credit profile, risk, structure, pricing, portfolio 
impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities. 
&lt;/p&gt;</oef:StrategyNarrativeTextBlock>
    <oef:StrategyPortfolioConcentration
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112182">Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax.</oef:StrategyPortfolioConcentration>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112183">Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Ohio</fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112184">Under normal market conditions, 
the Fund invests at least 80% of its total assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Ohio</fnd:NmRule35d1TermDfnSmryTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_PrincipalRisks2_S000006925Summary3Member"
      id="ixv-52203">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:13.0pt; font-family:Arial; text-align:left; color:#004C97; font-weight:normal; text-decoration:none;"&gt;Principal Risks&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;You could lose money by investing in the Fund. Mutual fund 
shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_RiskLoseMoneyMember_S000006925Summary3Member"
      id="ixv-112187">You could lose money by investing in the Fund.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_RiskNotInsuredMember_S000006925Summary3Member"
      id="ixv-112188">Mutual fund 
shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_InterestRate2_S000006925Summary3Member"
      id="ixv-52206">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Interest 
Rate:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 When interest rates rise, debt security prices generally fall. The opposite is also generally true: 
debt security prices rise when interest rates fall. Interest rate changes are influenced by a number 
of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, 
and supply of and demand for bonds. In general, securities with longer maturities or durations are more 
sensitive to interest rate changes. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_Credit2_S000006925Summary3Member"
      id="ixv-52210">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Credit:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  An issuer of debt securities may fail 
to make interest payments or repay principal when due, in whole or in part. Changes in an issuer's financial 
strength or in a security's or government's credit rating may affect a security's value. A change in 
the credit rating of a municipal bond insurer that insures securities in the Fund&#x2019;s portfolio may 
affect the value of the securities it insures, the Fund&#x2019;s share price and &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Fund 
performance. The Fund might also be adversely impacted by the inability of an insurer to meet its insurance 
obligations.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_Liquidity2_S000006925Summary3Member"
      id="ixv-52234">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The trading market for a particular security or type of security or other investments in which the Fund 
invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the 
Fund&#x2019;s ability to sell such securities or other investments when necessary to meet the Fund&#x2019;s 
liquidity needs, which may arise or increase in response to a specific economic event or because the 
investment manager wishes to purchase particular investments or believes that a higher level of liquidity 
would be advantageous. Reduced liquidity will also generally lower the value of such securities or other 
investments. Market prices for such securities or other investments may be relatively volatile.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_TaxLegislativeandPoliticalChanges2_S000006925Summary3Member"
      id="ixv-52238">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax 
Legislative and Political Changes:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The municipal securities market could be significantly affected 
by adverse political and legislative changes or litigation at the federal or state level. The value of 
municipal bonds is closely tied to the benefits of tax-exempt income to investors. Significant revisions 
of federal income tax laws or regulations revising income tax rates or the tax-exempt character of municipal 
bonds, or even proposed changes and deliberations on this topic by the federal government, could cause 
municipal bond prices to fall. For example, lower federal income tax rates would reduce certain relative 
advantages of owning municipal bonds, and lower state income tax rates could have similar effects. In 
addition, the application of corporate minimum tax rates to financial statement income may have the effect 
of reducing demand for municipal bonds among corporate investors, which may in turn impact municipal 
bond prices.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_Tax-ExemptSecurities2_S000006925Summary3Member"
      id="ixv-52242">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax-Exempt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Failure of a municipal security issuer 
to comply with applicable tax requirements may make income paid thereon taxable, resulting in a decline 
in the security&#x2019;s value. In addition, there could be changes in applicable tax laws or tax treatments 
that reduce or eliminate the current federal income tax exemption on municipal securities or otherwise 
adversely affect the current federal or state tax status of municipal securities.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_Market2_S000006925Summary3Member"
      id="ixv-52246">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Market: 
 &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The 
market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly 
or unpredictably. The market value of a security or other investment may be reduced by market activity 
or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all 
investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more 
buyers than sellers, prices tend to rise. In addition, the value of the Fund&#x2019;s investments may 
go up or down due to general market or other conditions that are not specifically related to a particular 
issuer, such as: real or perceived adverse economic changes, including widespread liquidity issues and 
defaults in one or more industries; changes in interest, inflation or exchange rates; unexpected natural 
and man-made world events, such as diseases or disasters; financial, political or social disruptions, 
including terrorism and war; and U.S. trade &lt;/span&gt;&lt;/p&gt;

&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;disputes 
or other disputes with specific countries that could result in additional tariffs, trade barriers and/or 
investment restrictions in certain securities in those countries. Any of these conditions can adversely 
affect the economic prospects of many companies, sectors, nations, regions and the market in general, 
in ways that cannot necessarily be foreseen.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Ongoing or threatened armed conflicts throughout the world 
have caused and could continue to cause significant market disruptions and volatility. The hostilities 
and sanctions resulting from those hostilities could have a significant impact on certain investments 
of the Fund as well as the Fund&#x2019;s performance and liquidity.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_Ohio2_S000006925Summary3Member"
      id="ixv-52271">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Ohio:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund invests predominantly in Ohio municipal securities. Therefore, events in Ohio are likely to 
affect the Fund&#x2019;s investments and its performance. These events may include economic or political 
policy changes, tax base erosion, unfunded pension and healthcare liabilities, constitutional limits 
on tax increases, budget deficits and other financial difficulties, and changes in the credit ratings 
assigned to municipal issuers of Ohio. The same is true of events in other states or U.S. territories, 
to the extent that the Fund has exposure to any other state or territory at any given time.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_Focus2_S000006925Summary3Member"
      id="ixv-52275">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Focus:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund may invest more than 25% of its assets in municipal securities that finance similar types of 
projects, such as utilities, hospitals, higher education and transportation. A change that affects one 
project, such as proposed legislation on the financing of the project, a shortage of the materials needed 
for the project, or a declining need for the project, would likely affect all similar projects, thereby 
increasing market risk.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_Income2_S000006925Summary3Member"
      id="ixv-52279">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Income:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund's distributions to shareholders 
may decline when prevailing interest rates fall, when the Fund experiences defaults on debt securities 
it holds or when the Fund realizes a loss upon the sale of a debt security. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_Prepayment2_S000006925Summary3Member"
      id="ixv-52283">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Prepayment:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Prepayment risk occurs when a debt security can be repaid in whole or in part prior to the security's 
maturity and the Fund must reinvest the proceeds it receives, during periods of declining interest rates, 
in securities that pay a lower rate of interest. Also, if a security has been purchased at a premium, 
the value of the premium would be lost in the event of prepayment. Prepayments generally increase when 
interest rates fall.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_Inflation2_S000006925Summary3Member"
      id="ixv-52287">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Inflation:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;  &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The market price of debt securities generally 
falls as inflation increases because the purchasing power of the future income and repaid principal is 
expected to be worth less when received by the Fund. Debt securities that pay a fixed rather than variable 
interest rate are especially vulnerable to inflation risk because variable-rate debt securities may be 
able to participate, over the long term, in rising interest rates which have historically corresponded 
with long-term inflationary trends.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_BondInsurers2_S000006925Summary3Member"
      id="ixv-52310">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Bond 
Insurers:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Market conditions or changes to ratings criteria could adversely impact the 
ratings of municipal bond insurance companies. Downgrades and withdrawal of ratings from municipal bond 
insurers have substantially limited the availability of insurance sought by municipal bond issuers thereby 
reducing the supply of insured municipal securities.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because of the consolidation among municipal 
bond insurers the Fund is subject to additional risks including the risk that credit risk may be concentrated 
among fewer insurers and the risk that events involving one or more municipal bond insurers could have 
a significant adverse effect on the value of the securities insured by an insurer and on the municipal 
markets as a whole.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_UnratedDebtSecurities2_S000006925Summary3Member"
      id="ixv-52315">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Unrated Debt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Certain unrated debt 
securities determined by the investment manager to be of comparable credit quality to rated securities 
which the Fund may purchase may pay a higher interest rate than such rated debt securities and be subject 
to a greater risk of illiquidity or price changes. Less public information and independent credit analysis 
are typically available about unrated securities or issuers, and therefore they may be subject to greater 
risk of default.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_Management2_S000006925Summary3Member"
      id="ixv-52319">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Management:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund is subject to management risk 
because it is an actively managed investment portfolio. The Fund's investment manager applies investment 
techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee 
that these decisions will produce the desired results.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_Cybersecurity2_S000006925Summary3Member"
      id="ixv-52323">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Cybersecurity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain 
access to Fund assets, Fund or customer data (including private shareholder information), or proprietary 
information, cause the Fund, the investment manager, and/or their service providers (including, but not 
limited to, Fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) 
to suffer data breaches, data corruption or loss of operational functionality or prevent Fund investors 
from purchasing, redeeming or exchanging shares or receiving distributions. The investment manager has 
limited ability to prevent or mitigate cybersecurity incidents affecting third party service providers, 
and such third party service providers may have limited indemnification obligations to the Fund or the 
investment manager. Cybersecurity incidents may result in financial losses to the Fund and its shareholders, 
and substantial costs may be incurred in an effort to prevent or mitigate future cybersecurity incidents. 
Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value 
of these securities could decline if the issuers experience cybersecurity incidents.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because technology is 
frequently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a 
chance that some risks have not been identified or prepared for, or that an attack may not be detected, 
which puts limitations on the Fund's ability to plan for or respond to a cyber attack. Like other &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;funds 
and business enterprises, the Fund, the investment manager, and their service providers are subject to 
the risk of cyber incidents occurring from time to time.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112189">Performance</oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-52349">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future. You can obtain updated performance information 
at www.franklintempleton.com or by calling (800) DIAL BEN/342-5236.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.&lt;/p&gt;</oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112190">The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance.</oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112191">The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112192">franklintempleton.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:PerformanceAvailabilityPhone
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112193">(800) DIAL BEN/342-5236</oef:PerformanceAvailabilityPhone>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112194">Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.</oef:BarChartDoesNotReflectSalesLoads>
    <oef:BarChartHeading
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112195">Class 
A Annual Total Returns</oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-52355">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:17.33%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:68%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.67%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Best Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2023, Q4&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;7.87%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Worst Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2022, Q1&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;-6.66%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="2" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:100%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; font-size:1pt;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.13%.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
</oef:BarChartClosingTextBlock>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member"
      id="ixv-112196">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member"
      id="ixv-112197">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112198"
      unitRef="pure">0.0787</oef:BarChartHighestQuarterlyReturn>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member"
      id="ixv-112199">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member"
      id="ixv-112200">2022-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112201"
      unitRef="pure">-0.0666</oef:BarChartLowestQuarterlyReturn>
    <oef:YearToDateReturnLabel
      contextRef="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member"
      id="ixv-112202">As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.13%.</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturnDate
      contextRef="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member"
      id="ixv-112203">2026-03-31</oef:BarChartYearToDateReturnDate>
    <oef:BarChartYearToDateReturn
      contextRef="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112204"
      unitRef="pure">-0.0013</oef:BarChartYearToDateReturn>
    <oef:PerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112205">Average 
Annual Total Returns (figures reflect sales charges) For periods ended December 
31, 2025</oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_C000205904Member_S000006925Member_S000006925Summary3Member"
      id="ixv-112206">Return before taxes</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112207"
      unitRef="pure">-0.0049</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112208"
      unitRef="pure">-0.0083</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112209"
      unitRef="pure">0.0132</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205904Member_S000006925Member_S000006925Summary3Member"
      id="ixv-112210">Return after taxes on 
distributions</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112211"
      unitRef="pure">-0.0050</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112212"
      unitRef="pure">-0.0085</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112213"
      unitRef="pure">0.0131</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205904Member_S000006925Member_S000006925Summary3Member"
      id="ixv-112214">Return after taxes on distributions and sale of Fund shares</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112215"
      unitRef="pure">0.0101</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112216"
      unitRef="pure">-0.0004</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112217"
      unitRef="pure">0.0164</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018786Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112218"
      unitRef="pure">-0.0038</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018786Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112219"
      unitRef="pure">-0.0068</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018786Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112220"
      unitRef="pure">0.0142</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018788Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112221"
      unitRef="pure">0.0192</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018788Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112222"
      unitRef="pure">-0.0052</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018788Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112223"
      unitRef="pure">0.0123</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000194366Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112224"
      unitRef="pure">0.0359</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000194366Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112225"
      unitRef="pure">0.0020</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20170801_20251231_C000194366Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="_2873_"
      unitRef="pure">0.0178</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000068552Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112227"
      unitRef="pure">0.0364</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000068552Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112228"
      unitRef="pure">0.0016</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000068552Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112229"
      unitRef="pure">0.0191</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalBondIndex320_S000006925Member_S000006925Summary3Member"
      id="ixv-112230">Bloomberg Municipal Bond 
Index </oef:AverageAnnualReturnLabel>
    <oef:IndexNoDeductionForFeesExpensesTaxes
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112231">(index reflects no deduction for fees, expenses or taxes)</oef:IndexNoDeductionForFeesExpensesTaxes>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalBondIndex320_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112232"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalBondIndex320_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112233"
      unitRef="pure">0.0080</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalBondIndex320_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-112234"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112235">Franklin 
Oregon Tax-Free Income Fund</oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112236">Investment Goal</oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-52732">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;To provide investors with 
as high a level of income exempt from federal income taxes and from personal income taxes, if any, for 
resident shareholders of Oregon as is consistent with prudent investment management and the preservation 
of shareholders&#x2019; capital.&lt;/p&gt;</oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112237">Fees and Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-52735">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;These tables describe 
the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;You may pay other fees 
(including on Class R6 and Advisor Class shares), such as brokerage commissions and other fees to financial 
intermediaries, which are not reflected in the tables and examples below.&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; You may qualify for 
sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at 
least $100,000 in Franklin Templeton funds and certain other funds distributed through Franklin Distributors, 
LLC, the Fund&#x2019;s distributor. More information about these and other discounts is available from 
your financial professional and under &#x201c;Your Account&#x201d; on page 133 in the Fund&#x2019;s Prospectus 
and under &#x201c;Buying and Selling Shares&#x201d; on page 58 of the Fund&#x2019;s Statement of Additional 
Information. In addition, more information about sales charge discounts and waivers for purchases of 
shares through specific financial intermediaries is set forth in Appendix A &#x2013; &#x201c;Intermediary 
Sales Charge Discounts and Waivers&#x201d; to the Fund&#x2019;s prospectus.&lt;/span&gt;&lt;/p&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112238">You may qualify for 
sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at 
least $100,000 in Franklin Templeton funds and certain other funds distributed through Franklin Distributors, 
LLC, the Fund&#x2019;s distributor.</oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112239"
      unitRef="usd">100000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112240">Shareholder 
Fees</oef:ShareholderFeesCaption>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112241"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018789Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112242"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018790Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112243"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194367Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112244"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000079640Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112245"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="_2895_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018789Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="_2896_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018790Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112248"
      unitRef="pure">0.0100</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194367Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112249"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000079640Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112250"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:OperatingExpensesCaption
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112251">Annual 
Fund Operating Expenses (expenses that you pay each year as a percentage of the value 
of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112252"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018789Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112253"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018790Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112254"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000194367Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112255"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000079640Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112256"
      unitRef="pure">0.0048</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112257"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018789Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112258"
      unitRef="pure">0.0010</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018790Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112259"
      unitRef="pure">0.0065</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000194367Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112260"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000079640Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112261"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112262"
      unitRef="pure">0.0009</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018789Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112263"
      unitRef="pure">0.0009</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018790Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112264"
      unitRef="pure">0.0008</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194367Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112265"
      unitRef="pure">0.0005</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079640Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112266"
      unitRef="pure">0.0009</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112267"
      unitRef="pure">0.0082</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018789Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112268"
      unitRef="pure">0.0067</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018790Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112269"
      unitRef="pure">0.0121</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194367Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112270"
      unitRef="pure">0.0053</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079640Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112271"
      unitRef="pure">0.0057</oef:ExpensesOverAssets>
    <oef:ExpenseExampleHeading
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112272">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-53011">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;This 
Example is intended to help you compare the cost of investing in the Fund with the cost of investing 
in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated 
and then redeem all of your shares at the end of the period. The Example also assumes that your investment 
has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual 
costs may be higher or lower, based on these assumptions your costs would be:&lt;/p&gt;</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112273"
      unitRef="usd">456</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112274"
      unitRef="usd">627</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112275"
      unitRef="usd">813</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112276"
      unitRef="usd">1350</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018789Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112277"
      unitRef="usd">441</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018789Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112278"
      unitRef="usd">582</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018789Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112279"
      unitRef="usd">735</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018789Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112280"
      unitRef="usd">1178</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018790Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112281"
      unitRef="usd">223</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018790Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112282"
      unitRef="usd">384</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018790Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112283"
      unitRef="usd">665</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018790Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112284"
      unitRef="usd">1357</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000194367Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112285"
      unitRef="usd">54</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000194367Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112286"
      unitRef="usd">170</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000194367Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112287"
      unitRef="usd">297</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000194367Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112288"
      unitRef="usd">665</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000079640Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112289"
      unitRef="usd">58</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000079640Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112290"
      unitRef="usd">183</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000079640Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112291"
      unitRef="usd">318</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000079640Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112292"
      unitRef="usd">713</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionByYearCaption
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112293">If you do not sell your shares:</oef:ExpenseExampleNoRedemptionByYearCaption>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Context_20260228_20260228_C000018790Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112294"
      unitRef="usd">123</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Context_20260228_20260228_C000018790Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112295"
      unitRef="usd">384</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Context_20260228_20260228_C000018790Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112296"
      unitRef="usd">665</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Context_20260228_20260228_C000018790Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112297"
      unitRef="usd">1357</oef:ExpenseExampleNoRedemptionYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112298">Portfolio 
Turnover</oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-53197">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities 
(or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs 
and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are 
not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During 
the most recent fiscal year, the Fund's portfolio turnover rate was 16.43% of the average value of its 
portfolio.&lt;/p&gt;</oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112299"
      unitRef="pure">0.1643</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112300">Principal Investment Strategies</oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-53200">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Under normal market conditions, 
the Fund invests at least 80% of its net assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Oregon. &lt;/p&gt;
&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although 
the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the 
Fund's net assets may be in securities that pay interest that may be subject to the federal alternative 
minimum tax and in securities that pay interest subject to other federal or state income taxes.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories 
by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities 
of comparable credit quality).&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund also may invest up to 35% of its total assets in municipal securities 
issued by U.S. territories.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the investment manager will search for investments across a large number 
of municipal securities that finance different types of projects, from time to time, based on economic 
conditions, the Fund may have significant positions in municipal securities that finance similar types 
of projects.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
investment manager selects securities that it believes will provide the best balance between risk and 
return within the Fund&#x2019;s range of allowable investments and typically invests with a long-term 
time horizon. This means it generally holds securities in the Fund&#x2019;s portfolio for income purposes, 
although the investment manager may sell a security at any time if it believes it could help the Fund 
meet its goal. With a focus on income, individual securities are considered for purchase or sale based 
on various factors and considerations, including credit profile, risk, structure, pricing, portfolio 
impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities. 
&lt;/p&gt;</oef:StrategyNarrativeTextBlock>
    <oef:StrategyPortfolioConcentration
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112301">Under normal market conditions, 
the Fund invests at least 80% of its net assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax.</oef:StrategyPortfolioConcentration>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112302">Under normal market conditions, 
the Fund invests at least 80% of its net assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Oregon</fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112303">Under normal market conditions, 
the Fund invests at least 80% of its net assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Oregon</fnd:NmRule35d1TermDfnSmryTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_PrincipalRisks2_S000006926Summary3Member"
      id="ixv-53226">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:13.0pt; font-family:Arial; text-align:left; color:#004C97; font-weight:normal; text-decoration:none;"&gt;Principal Risks&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;You could lose money by investing in the Fund. Mutual fund 
shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_RiskLoseMoneyMember_S000006926Summary3Member"
      id="ixv-112306">You could lose money by investing in the Fund.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_RiskNotInsuredMember_S000006926Summary3Member"
      id="ixv-112307">Mutual fund 
shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_InterestRate2_S000006926Summary3Member"
      id="ixv-53229">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Interest 
Rate:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 When interest rates rise, debt security prices generally fall. The opposite is also generally true: 
debt security prices rise when interest rates fall. Interest rate changes are influenced by a number 
of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, 
and supply of and demand for bonds. In general, securities with longer maturities or durations are more 
sensitive to interest rate changes. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_Credit2_S000006926Summary3Member"
      id="ixv-53233">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Credit:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  An issuer of debt securities may fail 
to make interest payments or repay principal when due, in whole or in part. Changes in an issuer's financial 
strength or in a security's or government's credit rating may affect a security's value. A change in 
the credit rating of a municipal bond insurer that insures securities in the Fund&#x2019;s portfolio may 
affect the value of the securities it insures, the Fund&#x2019;s share price and &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Fund 
performance. The Fund might also be adversely impacted by the inability of an insurer to meet its insurance 
obligations.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_Liquidity2_S000006926Summary3Member"
      id="ixv-53257">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The trading market for a particular security or type of security or other investments in which the Fund 
invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the 
Fund&#x2019;s ability to sell such securities or other investments when necessary to meet the Fund&#x2019;s 
liquidity needs, which may arise or increase in response to a specific economic event or because the 
investment manager wishes to purchase particular investments or believes that a higher level of liquidity 
would be advantageous. Reduced liquidity will also generally lower the value of such securities or other 
investments. Market prices for such securities or other investments may be relatively volatile.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_TaxLegislativeandPoliticalChanges2_S000006926Summary3Member"
      id="ixv-53261">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax 
Legislative and Political Changes:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The municipal securities market could be significantly affected 
by adverse political and legislative changes or litigation at the federal or state level. The value of 
municipal bonds is closely tied to the benefits of tax-exempt income to investors. Significant revisions 
of federal income tax laws or regulations revising income tax rates or the tax-exempt character of municipal 
bonds, or even proposed changes and deliberations on this topic by the federal government, could cause 
municipal bond prices to fall. For example, lower federal income tax rates would reduce certain relative 
advantages of owning municipal bonds, and lower state income tax rates could have similar effects. In 
addition, the application of corporate minimum tax rates to financial statement income may have the effect 
of reducing demand for municipal bonds among corporate investors, which may in turn impact municipal 
bond prices.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_Tax-ExemptSecurities2_S000006926Summary3Member"
      id="ixv-53265">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax-Exempt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Failure of a municipal security issuer 
to comply with applicable tax requirements may make income paid thereon taxable, resulting in a decline 
in the security&#x2019;s value. In addition, there could be changes in applicable tax laws or tax treatments 
that reduce or eliminate the current federal income tax exemption on municipal securities or otherwise 
adversely affect the current federal or state tax status of municipal securities.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_Market2_S000006926Summary3Member"
      id="ixv-53269">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Market: 
 &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The 
market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly 
or unpredictably. The market value of a security or other investment may be reduced by market activity 
or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all 
investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more 
buyers than sellers, prices tend to rise. In addition, the value of the Fund&#x2019;s investments may 
go up or down due to general market or other conditions that are not specifically related to a particular 
issuer, such as: real or perceived adverse economic changes, including widespread liquidity issues and 
defaults in one or more industries; changes in interest, inflation or exchange rates; unexpected natural 
and man-made world events, such as diseases or disasters; financial, political or social disruptions, 
including terrorism and war; and U.S. trade &lt;/span&gt;&lt;/p&gt;

&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;disputes 
or other disputes with specific countries that could result in additional tariffs, trade barriers and/or 
investment restrictions in certain securities in those countries. Any of these conditions can adversely 
affect the economic prospects of many companies, sectors, nations, regions and the market in general, 
in ways that cannot necessarily be foreseen.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Ongoing or threatened armed conflicts throughout the world 
have caused and could continue to cause significant market disruptions and volatility. The hostilities 
and sanctions resulting from those hostilities could have a significant impact on certain investments 
of the Fund as well as the Fund&#x2019;s performance and liquidity.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_Oregon2_S000006926Summary3Member"
      id="ixv-53294">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Oregon:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund invests predominantly in Oregon municipal securities. Therefore, events in Oregon are likely 
to affect the Fund&#x2019;s investments and its performance. These events may include economic or political 
policy changes, tax base erosion, unfunded pension and healthcare liabilities, constitutional limits 
on tax increases, budget deficits and other financial difficulties, and changes in the credit ratings 
assigned to municipal issuers of Oregon. The same is true of events in other states or U.S. territories, 
to the extent that the Fund has exposure to any other state or territory at any given time.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_Focus2_S000006926Summary3Member"
      id="ixv-53298">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Focus:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund may invest more than 25% of its assets in municipal securities that finance similar types of 
projects, such as utilities, hospitals, higher education and transportation. A change that affects one 
project, such as proposed legislation on the financing of the project, a shortage of the materials needed 
for the project, or a declining need for the project, would likely affect all similar projects, thereby 
increasing market risk.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_Income2_S000006926Summary3Member"
      id="ixv-53302">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Income:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund's distributions to shareholders 
may decline when prevailing interest rates fall, when the Fund experiences defaults on debt securities 
it holds or when the Fund realizes a loss upon the sale of a debt security. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_Prepayment2_S000006926Summary3Member"
      id="ixv-53306">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Prepayment:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Prepayment risk occurs when a debt security can be repaid in whole or in part prior to the security's 
maturity and the Fund must reinvest the proceeds it receives, during periods of declining interest rates, 
in securities that pay a lower rate of interest. Also, if a security has been purchased at a premium, 
the value of the premium would be lost in the event of prepayment. Prepayments generally increase when 
interest rates fall.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_Inflation2_S000006926Summary3Member"
      id="ixv-53310">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Inflation:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;  &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The market price of debt securities generally 
falls as inflation increases because the purchasing power of the future income and repaid principal is 
expected to be worth less when received by the Fund. Debt securities that pay a fixed rather than variable 
interest rate are especially vulnerable to inflation risk because variable-rate debt securities may be 
able to participate, over the long term, in rising interest rates which have historically corresponded 
with long-term inflationary trends.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_BondInsurers2_S000006926Summary3Member"
      id="ixv-53333">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Bond 
Insurers:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Market conditions or changes to ratings criteria could adversely impact the 
ratings of municipal bond insurance companies. Downgrades and withdrawal of ratings from municipal bond 
insurers have substantially limited the availability of insurance sought by municipal bond issuers thereby 
reducing the supply of insured municipal securities.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because of the consolidation among municipal 
bond insurers the Fund is subject to additional risks including the risk that credit risk may be concentrated 
among fewer insurers and the risk that events involving one or more municipal bond insurers could have 
a significant adverse effect on the value of the securities insured by an insurer and on the municipal 
markets as a whole.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_UnratedDebtSecurities2_S000006926Summary3Member"
      id="ixv-53338">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Unrated Debt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Certain unrated debt 
securities determined by the investment manager to be of comparable credit quality to rated securities 
which the Fund may purchase may pay a higher interest rate than such rated debt securities and be subject 
to a greater risk of illiquidity or price changes. Less public information and independent credit analysis 
are typically available about unrated securities or issuers, and therefore they may be subject to greater 
risk of default.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_Management2_S000006926Summary3Member"
      id="ixv-53342">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Management:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund is subject to management risk 
because it is an actively managed investment portfolio. The Fund's investment manager applies investment 
techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee 
that these decisions will produce the desired results.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_Cybersecurity2_S000006926Summary3Member"
      id="ixv-53346">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Cybersecurity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain 
access to Fund assets, Fund or customer data (including private shareholder information), or proprietary 
information, cause the Fund, the investment manager, and/or their service providers (including, but not 
limited to, Fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) 
to suffer data breaches, data corruption or loss of operational functionality or prevent Fund investors 
from purchasing, redeeming or exchanging shares or receiving distributions. The investment manager has 
limited ability to prevent or mitigate cybersecurity incidents affecting third party service providers, 
and such third party service providers may have limited indemnification obligations to the Fund or the 
investment manager. Cybersecurity incidents may result in financial losses to the Fund and its shareholders, 
and substantial costs may be incurred in an effort to prevent or mitigate future cybersecurity incidents. 
Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value 
of these securities could decline if the issuers experience cybersecurity incidents.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because technology is 
frequently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a 
chance that some risks have not been identified or prepared for, or that an attack may not be detected, 
which puts limitations on the Fund's ability to plan for or respond to a cyber attack. Like other &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;funds 
and business enterprises, the Fund, the investment manager, and their service providers are subject to 
the risk of cyber incidents occurring from time to time.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112308">Performance</oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-53372">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future. You can obtain updated performance information 
at www.franklintempleton.com or by calling (800) DIAL BEN/342-5236.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.&lt;/p&gt;</oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112309">The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance.</oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112310">The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112311">franklintempleton.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:PerformanceAvailabilityPhone
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112312">(800) DIAL BEN/342-5236</oef:PerformanceAvailabilityPhone>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112313">Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.</oef:BarChartDoesNotReflectSalesLoads>
    <oef:BarChartHeading
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112314">Class 
A Annual Total Returns</oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-53378">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:17.33%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:68%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.67%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Best Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2023, Q4&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;7.69%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Worst Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2022, Q1&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;-6.43%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="2" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:100%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; font-size:1pt;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.31%.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
</oef:BarChartClosingTextBlock>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member"
      id="ixv-112315">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member"
      id="ixv-112316">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112317"
      unitRef="pure">0.0769</oef:BarChartHighestQuarterlyReturn>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member"
      id="ixv-112318">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member"
      id="ixv-112319">2022-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112320"
      unitRef="pure">-0.0643</oef:BarChartLowestQuarterlyReturn>
    <oef:YearToDateReturnLabel
      contextRef="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member"
      id="ixv-112321">As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.31%.</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturnDate
      contextRef="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member"
      id="ixv-112322">2026-03-31</oef:BarChartYearToDateReturnDate>
    <oef:BarChartYearToDateReturn
      contextRef="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112323"
      unitRef="pure">-0.0031</oef:BarChartYearToDateReturn>
    <oef:PerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112324">Average 
Annual Total Returns (figures reflect sales charges) For periods ended December 
31, 2025</oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_C000205905Member_S000006926Member_S000006926Summary3Member"
      id="ixv-112325">Return before taxes</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112326"
      unitRef="pure">-0.0059</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112327"
      unitRef="pure">-0.0073</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112328"
      unitRef="pure">0.0125</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205905Member_S000006926Member_S000006926Summary3Member"
      id="ixv-112329">Return after taxes on 
distributions</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112330"
      unitRef="pure">-0.0060</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112331"
      unitRef="pure">-0.0074</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112332"
      unitRef="pure">0.0124</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205905Member_S000006926Member_S000006926Summary3Member"
      id="ixv-112333">Return after taxes on distributions and sale of Fund shares</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112334"
      unitRef="pure">0.0094</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112335"
      unitRef="pure">0.0004</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112336"
      unitRef="pure">0.0159</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018789Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112337"
      unitRef="pure">-0.0047</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018789Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112338"
      unitRef="pure">-0.0059</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018789Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112339"
      unitRef="pure">0.0135</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018790Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112340"
      unitRef="pure">0.0181</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018790Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112341"
      unitRef="pure">-0.0041</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018790Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112342"
      unitRef="pure">0.0115</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000194367Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112343"
      unitRef="pure">0.0357</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000194367Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112344"
      unitRef="pure">0.0032</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20170801_20251231_C000194367Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="_3028_"
      unitRef="pure">0.0174</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000079640Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112346"
      unitRef="pure">0.0353</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000079640Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112347"
      unitRef="pure">0.0028</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000079640Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112348"
      unitRef="pure">0.0183</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalBondIndex321_S000006926Member_S000006926Summary3Member"
      id="ixv-112349">Bloomberg Municipal Bond 
Index </oef:AverageAnnualReturnLabel>
    <oef:IndexNoDeductionForFeesExpensesTaxes
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112350">(index reflects no deduction for fees, expenses or taxes)</oef:IndexNoDeductionForFeesExpensesTaxes>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalBondIndex321_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112351"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalBondIndex321_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112352"
      unitRef="pure">0.0080</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalBondIndex321_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-112353"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <oef:RiskReturnHeading
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112354">Franklin 
Pennsylvania Tax-Free Income Fund</oef:RiskReturnHeading>
    <oef:ObjectiveHeading
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112355">Investment Goal</oef:ObjectiveHeading>
    <oef:ObjectivePrimaryTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-53757">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;To provide investors with 
as high a level of income exempt from federal income taxes and from personal income taxes, if any, for 
resident shareholders of Pennsylvania as is consistent with prudent investment management and the preservation 
of shareholders&#x2019; capital.&lt;/p&gt;</oef:ObjectivePrimaryTextBlock>
    <oef:ExpenseHeading
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112356">Fees and Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-53760">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;These tables describe 
the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;You may pay other fees 
(including on Class R6 and Advisor Class shares), such as brokerage commissions and other fees to financial 
intermediaries, which are not reflected in the tables and examples below.&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; You may qualify for 
sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at 
least $100,000 in Franklin Templeton funds and certain other funds distributed through Franklin Distributors, 
LLC, the Fund&#x2019;s distributor. More information about these and other discounts is available from 
your financial professional and under &#x201c;Your Account&#x201d; on page 133 in the Fund&#x2019;s Prospectus 
and under &#x201c;Buying and Selling Shares&#x201d; on page 58 of the Fund&#x2019;s Statement of Additional 
Information. In addition, more information about sales charge discounts and waivers for purchases of 
shares through specific financial intermediaries is set forth in Appendix A &#x2013; &#x201c;Intermediary 
Sales Charge Discounts and Waivers&#x201d; to the Fund&#x2019;s prospectus.&lt;/span&gt;&lt;/p&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:ExpenseBreakpointDiscounts
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112357">You may qualify for 
sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at 
least $100,000 in Franklin Templeton funds and certain other funds distributed through Franklin Distributors, 
LLC, the Fund&#x2019;s distributor.</oef:ExpenseBreakpointDiscounts>
    <oef:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112358"
      unitRef="usd">100000</oef:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <oef:ShareholderFeesCaption
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112359">Shareholder 
Fees</oef:ShareholderFeesCaption>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112360"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018791Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112361"
      unitRef="pure">0.0375</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018793Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112362"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194368Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112363"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice
      contextRef="Context_20260228_20260228_C000079641Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112364"
      unitRef="pure">0</oef:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="_3050_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018791Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="_3051_"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000018793Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112367"
      unitRef="pure">0.0100</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000194368Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112368"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="Context_20260228_20260228_C000079641Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112369"
      unitRef="pure">0</oef:MaximumDeferredSalesChargeOverOfferingPrice>
    <oef:OperatingExpensesCaption
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112370">Annual 
Fund Operating Expenses (expenses that you pay each year as a percentage of the value 
of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112371"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018791Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112372"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000018793Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112373"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000194368Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112374"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:ManagementFeesOverAssets
      contextRef="Context_20260228_20260228_C000079641Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112375"
      unitRef="pure">0.0049</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112376"
      unitRef="pure">0.0025</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018791Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112377"
      unitRef="pure">0.0010</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000018793Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112378"
      unitRef="pure">0.0065</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000194368Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112379"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets
      contextRef="Context_20260228_20260228_C000079641Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112380"
      unitRef="pure">0</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112381"
      unitRef="pure">0.0011</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018791Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112382"
      unitRef="pure">0.0011</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018793Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112383"
      unitRef="pure">0.0010</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194368Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112384"
      unitRef="pure">0.0006</oef:OtherExpensesOverAssets>
    <oef:OtherExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079641Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112385"
      unitRef="pure">0.0011</oef:OtherExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112386"
      unitRef="pure">0.0085</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018791Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112387"
      unitRef="pure">0.0070</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000018793Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112388"
      unitRef="pure">0.0124</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000194368Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112389"
      unitRef="pure">0.0055</oef:ExpensesOverAssets>
    <oef:ExpensesOverAssets
      contextRef="Context_20260228_20260228_C000079641Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112390"
      unitRef="pure">0.0060</oef:ExpensesOverAssets>
    <oef:ExpenseExampleHeading
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112391">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-54036">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;This 
Example is intended to help you compare the cost of investing in the Fund with the cost of investing 
in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated 
and then redeem all of your shares at the end of the period. The Example also assumes that your investment 
has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual 
costs may be higher or lower, based on these assumptions your costs would be:&lt;/p&gt;</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112392"
      unitRef="usd">459</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112393"
      unitRef="usd">637</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112394"
      unitRef="usd">829</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112395"
      unitRef="usd">1385</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018791Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112396"
      unitRef="usd">444</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018791Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112397"
      unitRef="usd">591</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018791Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112398"
      unitRef="usd">750</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018791Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112399"
      unitRef="usd">1213</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000018793Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112400"
      unitRef="usd">226</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000018793Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112401"
      unitRef="usd">393</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000018793Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112402"
      unitRef="usd">680</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000018793Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112403"
      unitRef="usd">1392</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000194368Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112404"
      unitRef="usd">56</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000194368Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112405"
      unitRef="usd">176</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000194368Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112406"
      unitRef="usd">307</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000194368Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112407"
      unitRef="usd">689</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleYear01
      contextRef="Context_20260228_20260228_C000079641Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112408"
      unitRef="usd">61</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03
      contextRef="Context_20260228_20260228_C000079641Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112409"
      unitRef="usd">192</oef:ExpenseExampleYear03>
    <oef:ExpenseExampleYear05
      contextRef="Context_20260228_20260228_C000079641Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112410"
      unitRef="usd">335</oef:ExpenseExampleYear05>
    <oef:ExpenseExampleYear10
      contextRef="Context_20260228_20260228_C000079641Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112411"
      unitRef="usd">750</oef:ExpenseExampleYear10>
    <oef:ExpenseExampleNoRedemptionByYearCaption
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112412">If you do not sell your shares:</oef:ExpenseExampleNoRedemptionByYearCaption>
    <oef:ExpenseExampleNoRedemptionYear01
      contextRef="Context_20260228_20260228_C000018793Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112413"
      unitRef="usd">126</oef:ExpenseExampleNoRedemptionYear01>
    <oef:ExpenseExampleNoRedemptionYear03
      contextRef="Context_20260228_20260228_C000018793Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112414"
      unitRef="usd">393</oef:ExpenseExampleNoRedemptionYear03>
    <oef:ExpenseExampleNoRedemptionYear05
      contextRef="Context_20260228_20260228_C000018793Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112415"
      unitRef="usd">680</oef:ExpenseExampleNoRedemptionYear05>
    <oef:ExpenseExampleNoRedemptionYear10
      contextRef="Context_20260228_20260228_C000018793Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112416"
      unitRef="usd">1392</oef:ExpenseExampleNoRedemptionYear10>
    <oef:PortfolioTurnoverHeading
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112417">Portfolio 
Turnover</oef:PortfolioTurnoverHeading>
    <oef:PortfolioTurnoverTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-54222">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund pays transaction costs, such as commissions, when it buys and sells securities 
(or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs 
and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are 
not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During 
the most recent fiscal year, the Fund's portfolio turnover rate was 15.53% of the average value of its 
portfolio.&lt;/p&gt;</oef:PortfolioTurnoverTextBlock>
    <oef:PortfolioTurnoverRate
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112418"
      unitRef="pure">0.1553</oef:PortfolioTurnoverRate>
    <oef:StrategyHeading
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112419">Principal Investment Strategies</oef:StrategyHeading>
    <oef:StrategyNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-54225">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Under normal market conditions, 
the Fund invests at least 80% of its net assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Pennsylvania. &lt;/p&gt;
&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although 
the Fund tries to invest all of its assets in tax-free securities, it is possible that up to 20% of the 
Fund's net assets may be in securities that pay interest that may be subject to the federal alternative 
minimum tax and in securities that pay interest subject to other federal or state income taxes.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
Fund only buys municipal securities rated, at the time of purchase, in one of the top four ratings categories 
by one or more U.S. nationally recognized rating services (or unrated or short-term rated securities 
of comparable credit quality).&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The Fund also may invest up to 35% of its total assets in municipal securities 
issued by U.S. territories.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Although the investment manager will search for investments across a large number 
of municipal securities that finance different types of projects, from time to time, based on economic 
conditions, the Fund may have significant positions in municipal securities that finance similar types 
of projects.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The 
investment manager selects securities that it believes will provide the best balance between risk and 
return within the Fund&#x2019;s range of allowable investments and typically invests with a long-term 
time horizon. This means it generally holds securities in the Fund&#x2019;s portfolio for income purposes, 
although the investment manager may sell a security at any time if it believes it could help the Fund 
meet its goal. With a focus on income, individual securities are considered for purchase or sale based 
on various factors and considerations, including credit profile, risk, structure, pricing, portfolio 
impact, duration management, restructuring, opportunistic trading and tax loss harvesting opportunities. 
&lt;/p&gt;</oef:StrategyNarrativeTextBlock>
    <oef:StrategyPortfolioConcentration
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112420">Under normal market conditions, 
the Fund invests at least 80% of its net assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax.</oef:StrategyPortfolioConcentration>
    <fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112421">Under normal market conditions, 
the Fund invests at least 80% of its net assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Pennsylvania</fnd:NmRule35d1EightyPctInvstmntPlcyTextBlock>
    <fnd:NmRule35d1TermDfnSmryTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112422">Under normal market conditions, 
the Fund invests at least 80% of its net assets in securities whose interest is free from federal income 
taxes, including the federal alternative minimum tax. In addition, under normal market conditions, the 
Fund invests at least 80% of its total assets in securities that pay interest free from the personal 
income taxes, if any, of Pennsylvania</fnd:NmRule35d1TermDfnSmryTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_PrincipalRisks2_S000006927Summary3Member"
      id="ixv-54251">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:13.0pt; font-family:Arial; text-align:left; color:#004C97; font-weight:normal; text-decoration:none;"&gt;Principal Risks&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;You could lose money by investing in the Fund. Mutual fund 
shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_RiskLoseMoneyMember_S000006927Summary3Member"
      id="ixv-112425">You could lose money by investing in the Fund.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_RiskNotInsuredMember_S000006927Summary3Member"
      id="ixv-112426">Mutual fund 
shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured 
by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. 
government.</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_InterestRate2_S000006927Summary3Member"
      id="ixv-54254">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Interest 
Rate:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 When interest rates rise, debt security prices generally fall. The opposite is also generally true: 
debt security prices rise when interest rates fall. Interest rate changes are influenced by a number 
of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, 
and supply of and demand for bonds. In general, securities with longer maturities or durations are more 
sensitive to interest rate changes. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_Credit2_S000006927Summary3Member"
      id="ixv-54258">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Credit:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  An issuer of debt securities may fail 
to make interest payments or repay principal when due, in whole or in part. Changes in an issuer's financial 
strength or in a security's or government's credit rating may affect a security's value. A change in 
the credit rating of a municipal bond insurer that insures securities in the Fund&#x2019;s portfolio may 
affect the value of the securities it insures, the Fund&#x2019;s share price and &lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Fund 
performance. The Fund might also be adversely impacted by the inability of an insurer to meet its insurance 
obligations.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_Liquidity2_S000006927Summary3Member"
      id="ixv-54282">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Liquidity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The trading market for a particular security or type of security or other investments in which the Fund 
invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the 
Fund&#x2019;s ability to sell such securities or other investments when necessary to meet the Fund&#x2019;s 
liquidity needs, which may arise or increase in response to a specific economic event or because the 
investment manager wishes to purchase particular investments or believes that a higher level of liquidity 
would be advantageous. Reduced liquidity will also generally lower the value of such securities or other 
investments. Market prices for such securities or other investments may be relatively volatile.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_TaxLegislativeandPoliticalChanges2_S000006927Summary3Member"
      id="ixv-54286">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax 
Legislative and Political Changes:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The municipal securities market could be significantly affected 
by adverse political and legislative changes or litigation at the federal or state level. The value of 
municipal bonds is closely tied to the benefits of tax-exempt income to investors. Significant revisions 
of federal income tax laws or regulations revising income tax rates or the tax-exempt character of municipal 
bonds, or even proposed changes and deliberations on this topic by the federal government, could cause 
municipal bond prices to fall. For example, lower federal income tax rates would reduce certain relative 
advantages of owning municipal bonds, and lower state income tax rates could have similar effects. In 
addition, the application of corporate minimum tax rates to financial statement income may have the effect 
of reducing demand for municipal bonds among corporate investors, which may in turn impact municipal 
bond prices.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_Tax-ExemptSecurities2_S000006927Summary3Member"
      id="ixv-54290">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Tax-Exempt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Failure of a municipal security issuer 
to comply with applicable tax requirements may make income paid thereon taxable, resulting in a decline 
in the security&#x2019;s value. In addition, there could be changes in applicable tax laws or tax treatments 
that reduce or eliminate the current federal income tax exemption on municipal securities or otherwise 
adversely affect the current federal or state tax status of municipal securities.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_Market2_S000006927Summary3Member"
      id="ixv-54294">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Market: 
 &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The 
market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly 
or unpredictably. The market value of a security or other investment may be reduced by market activity 
or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all 
investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more 
buyers than sellers, prices tend to rise. In addition, the value of the Fund&#x2019;s investments may 
go up or down due to general market or other conditions that are not specifically related to a particular 
issuer, such as: real or perceived adverse economic changes, including widespread liquidity issues and 
defaults in one or more industries; changes in interest, inflation or exchange rates; unexpected natural 
and man-made world events, such as diseases or disasters; financial, political or social disruptions, 
including terrorism and war; and U.S. trade &lt;/span&gt;&lt;/p&gt;

&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;disputes 
or other disputes with specific countries that could result in additional tariffs, trade barriers and/or 
investment restrictions in certain securities in those countries. Any of these conditions can adversely 
affect the economic prospects of many companies, sectors, nations, regions and the market in general, 
in ways that cannot necessarily be foreseen.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Ongoing or threatened armed conflicts throughout the world 
have caused and could continue to cause significant market disruptions and volatility. The hostilities 
and sanctions resulting from those hostilities could have a significant impact on certain investments 
of the Fund as well as the Fund&#x2019;s performance and liquidity.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_Pennsylvania2_S000006927Summary3Member"
      id="ixv-54319">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Pennsylvania:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund invests predominantly in Pennsylvania municipal securities. Therefore, events in Pennsylvania 
are likely to affect the Fund&#x2019;s investments and its performance. These events may include economic 
or political policy changes, tax base erosion, unfunded pension and healthcare liabilities, constitutional 
limits on tax increases, budget deficits and other financial difficulties, and changes in the credit 
ratings assigned to municipal issuers of Pennsylvania. The same is true of events in other states or 
U.S. territories, to the extent that the Fund has exposure to any other state or territory at any given 
time.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_Focus2_S000006927Summary3Member"
      id="ixv-54323">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Focus:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 The Fund may invest more than 25% of its assets in municipal securities that finance similar types of 
projects, such as utilities, hospitals, higher education and transportation. A change that affects one 
project, such as proposed legislation on the financing of the project, a shortage of the materials needed 
for the project, or a declining need for the project, would likely affect all similar projects, thereby 
increasing market risk.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_Income2_S000006927Summary3Member"
      id="ixv-54327">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Income:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund's distributions to shareholders 
may decline when prevailing interest rates fall, when the Fund experiences defaults on debt securities 
it holds or when the Fund realizes a loss upon the sale of a debt security. &lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_Prepayment2_S000006927Summary3Member"
      id="ixv-54331">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Prepayment:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Prepayment risk occurs when a debt security can be repaid in whole or in part prior to the security's 
maturity and the Fund must reinvest the proceeds it receives, during periods of declining interest rates, 
in securities that pay a lower rate of interest. Also, if a security has been purchased at a premium, 
the value of the premium would be lost in the event of prepayment. Prepayments generally increase when 
interest rates fall.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_Inflation2_S000006927Summary3Member"
      id="ixv-54335">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Inflation:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:bold; text-decoration:none;"&gt;  &lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;The market price of debt securities generally 
falls as inflation increases because the purchasing power of the future income and repaid principal is 
expected to be worth less when received by the Fund. Debt securities that pay a fixed rather than variable 
interest rate are especially vulnerable to inflation risk because variable-rate debt securities may be 
able to participate, over the long term, in rising interest rates which have historically corresponded 
with long-term inflationary trends.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_BondInsurers2_S000006927Summary3Member"
      id="ixv-54358">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Bond 
Insurers:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Market conditions or changes to ratings criteria could adversely impact the 
ratings of municipal bond insurance companies. Downgrades and withdrawal of ratings from municipal bond 
insurers have substantially limited the availability of insurance sought by municipal bond issuers thereby 
reducing the supply of insured municipal securities.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because of the consolidation among municipal 
bond insurers the Fund is subject to additional risks including the risk that credit risk may be concentrated 
among fewer insurers and the risk that events involving one or more municipal bond insurers could have 
a significant adverse effect on the value of the securities insured by an insurer and on the municipal 
markets as a whole.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_UnratedDebtSecurities2_S000006927Summary3Member"
      id="ixv-54363">&lt;p style="margin-top:revert; margin-bottom:revert;font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Unrated Debt Securities:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  Certain unrated debt 
securities determined by the investment manager to be of comparable credit quality to rated securities 
which the Fund may purchase may pay a higher interest rate than such rated debt securities and be subject 
to a greater risk of illiquidity or price changes. Less public information and independent credit analysis 
are typically available about unrated securities or issuers, and therefore they may be subject to greater 
risk of default.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_Management2_S000006927Summary3Member"
      id="ixv-54367">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Management:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt;  The Fund is subject to management risk 
because it is an actively managed investment portfolio. The Fund's investment manager applies investment 
techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee 
that these decisions will produce the desired results.&lt;/span&gt;&lt;/p&gt;</oef:RiskTextBlock>
    <oef:RiskTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_Cybersecurity2_S000006927Summary3Member"
      id="ixv-54371">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; font-style:normal;"&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; color:#004C97; font-weight:bold; text-decoration:none;"&gt;Cybersecurity:&lt;/span&gt;&lt;span style="font-size:9.0pt; font-family:Arial; font-style:normal; font-weight:normal; text-decoration:none;"&gt; 
 Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain 
access to Fund assets, Fund or customer data (including private shareholder information), or proprietary 
information, cause the Fund, the investment manager, and/or their service providers (including, but not 
limited to, Fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) 
to suffer data breaches, data corruption or loss of operational functionality or prevent Fund investors 
from purchasing, redeeming or exchanging shares or receiving distributions. The investment manager has 
limited ability to prevent or mitigate cybersecurity incidents affecting third party service providers, 
and such third party service providers may have limited indemnification obligations to the Fund or the 
investment manager. Cybersecurity incidents may result in financial losses to the Fund and its shareholders, 
and substantial costs may be incurred in an effort to prevent or mitigate future cybersecurity incidents. 
Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value 
of these securities could decline if the issuers experience cybersecurity incidents.&lt;/span&gt;&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Because technology is 
frequently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a 
chance that some risks have not been identified or prepared for, or that an attack may not be detected, 
which puts limitations on the Fund's ability to plan for or respond to a cyber attack. Like other &lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;funds 
and business enterprises, the Fund, the investment manager, and their service providers are subject to 
the risk of cyber incidents occurring from time to time.&lt;/p&gt;</oef:RiskTextBlock>
    <oef:BarChartAndPerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112427">Performance</oef:BarChartAndPerformanceTableHeading>
    <oef:PerformanceNarrativeTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-54397">&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance. The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future. You can obtain updated performance information 
at www.franklintempleton.com or by calling (800) DIAL BEN/342-5236.&lt;/p&gt;&lt;p style="margin-top:revert; margin-bottom:revert; font-size:9.0pt; font-family:Arial; text-align:left; font-weight:normal; text-decoration:none;"&gt;Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.&lt;/p&gt;</oef:PerformanceNarrativeTextBlock>
    <oef:PerformanceInformationIllustratesVariabilityOfReturns
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112428">The following bar chart 
and table provide some indication of the risks of investing in the Fund. The bar chart shows changes 
in the Fund's performance from year to year for Class A shares. The table shows how the Fund's average 
annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of 
a broad measure of market performance.</oef:PerformanceInformationIllustratesVariabilityOfReturns>
    <oef:PerformancePastDoesNotIndicateFuture
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112429">The Fund's past performance (before and after taxes) is not necessarily 
an indication of how the Fund will perform in the future.</oef:PerformancePastDoesNotIndicateFuture>
    <oef:PerformanceAvailabilityWebSiteAddress
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112430">franklintempleton.com</oef:PerformanceAvailabilityWebSiteAddress>
    <oef:PerformanceAvailabilityPhone
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112431">(800) DIAL BEN/342-5236</oef:PerformanceAvailabilityPhone>
    <oef:BarChartDoesNotReflectSalesLoads
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112432">Sales charges are not reflected in the bar 
chart, and if those charges were included, returns would be less than those shown.</oef:BarChartDoesNotReflectSalesLoads>
    <oef:BarChartHeading
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112433">Class 
A Annual Total Returns</oef:BarChartHeading>
    <oef:BarChartClosingTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-54403">&lt;table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:17.33%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:68%;"&gt;&#160;&lt;/td&gt;&lt;td style="width:14.67%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Best Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2023, Q4&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;8.43%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;Worst Quarter: &lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;2022, Q1&lt;/p&gt;&lt;/td&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; border-top:0.5pt; border-top-style:solid; border-top-color:#A7A7A7;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:right; font-weight:normal; text-decoration:none;"&gt;-6.53%&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;table cellpadding="2" cellspacing="0" style="border-collapse:collapse" width="100%"&gt;&lt;tr style="font-size:1pt;"&gt;&lt;td style="width:100%;"&gt;&#160;&lt;/td&gt;&lt;/tr&gt;&lt;tr&gt;&lt;td style="vertical-align:top; border-bottom:0.5pt; border-bottom-style:solid; border-bottom-color:#A7A7A7; font-size:1pt;"&gt;&lt;p style="font-size:8.5pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;"&gt;As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.34%.&lt;/p&gt;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;
</oef:BarChartClosingTextBlock>
    <oef:HighestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member"
      id="ixv-112434">Best Quarter</oef:HighestQuarterlyReturnLabel>
    <oef:BarChartHighestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member"
      id="ixv-112435">2023-12-31</oef:BarChartHighestQuarterlyReturnDate>
    <oef:BarChartHighestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112436"
      unitRef="pure">0.0843</oef:BarChartHighestQuarterlyReturn>
    <oef:LowestQuarterlyReturnLabel
      contextRef="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member"
      id="ixv-112437">Worst Quarter</oef:LowestQuarterlyReturnLabel>
    <oef:BarChartLowestQuarterlyReturnDate
      contextRef="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member"
      id="ixv-112438">2022-03-31</oef:BarChartLowestQuarterlyReturnDate>
    <oef:BarChartLowestQuarterlyReturn
      contextRef="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112439"
      unitRef="pure">-0.0653</oef:BarChartLowestQuarterlyReturn>
    <oef:YearToDateReturnLabel
      contextRef="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member"
      id="ixv-112440">As of March 31, 2026, 
the Fund&#x2019;s year-to-date return was -0.34%.</oef:YearToDateReturnLabel>
    <oef:BarChartYearToDateReturnDate
      contextRef="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member"
      id="ixv-112441">2026-03-31</oef:BarChartYearToDateReturnDate>
    <oef:BarChartYearToDateReturn
      contextRef="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112442"
      unitRef="pure">-0.0034</oef:BarChartYearToDateReturn>
    <oef:PerformanceTableHeading
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112443">Average 
Annual Total Returns (figures reflect sales charges) For periods ended December 
31, 2025</oef:PerformanceTableHeading>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_C000205906Member_S000006927Member_S000006927Summary3Member"
      id="ixv-112444">Return before taxes</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112445"
      unitRef="pure">-0.0087</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112446"
      unitRef="pure">-0.0072</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112447"
      unitRef="pure">0.0112</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsMember_C000205906Member_S000006927Member_S000006927Summary3Member"
      id="ixv-112448">Return after taxes on 
distributions</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsMember_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112449"
      unitRef="pure">-0.0088</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsMember_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112450"
      unitRef="pure">-0.0073</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsMember_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112451"
      unitRef="pure">0.0111</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_AfterTaxesOnDistributionsAndSalesMember_C000205906Member_S000006927Member_S000006927Summary3Member"
      id="ixv-112452">Return after taxes on distributions and sale of Fund shares</oef:AverageAnnualReturnLabel>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112453"
      unitRef="pure">0.0076</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112454"
      unitRef="pure">0.0004</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_AfterTaxesOnDistributionsAndSalesMember_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112455"
      unitRef="pure">0.0153</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018791Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112456"
      unitRef="pure">-0.0058</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018791Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112457"
      unitRef="pure">-0.0056</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018791Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112458"
      unitRef="pure">0.0123</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000018793Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112459"
      unitRef="pure">0.0165</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000018793Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112460"
      unitRef="pure">-0.0038</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000018793Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112461"
      unitRef="pure">0.0104</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000194368Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112462"
      unitRef="pure">0.0328</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000194368Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112463"
      unitRef="pure">0.0033</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20170801_20251231_C000194368Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="_3183_"
      unitRef="pure">0.0160</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_C000079641Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112465"
      unitRef="pure">0.0324</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_C000079641Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112466"
      unitRef="pure">0.0030</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_C000079641Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112467"
      unitRef="pure">0.0172</oef:AvgAnnlRtrPct>
    <oef:AverageAnnualReturnLabel
      contextRef="Context_20260228_20260228_BloombergMunicipalBondIndex322_S000006927Member_S000006927Summary3Member"
      id="ixv-112468">Bloomberg Municipal Bond Index </oef:AverageAnnualReturnLabel>
    <oef:IndexNoDeductionForFeesExpensesTaxes
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112469">(index reflects no deduction 
for fees, expenses or taxes)</oef:IndexNoDeductionForFeesExpensesTaxes>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20250101_20251231_BloombergMunicipalBondIndex322_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112470"
      unitRef="pure">0.0425</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20210101_20251231_BloombergMunicipalBondIndex322_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112471"
      unitRef="pure">0.0080</oef:AvgAnnlRtrPct>
    <oef:AvgAnnlRtrPct
      contextRef="Context_20160101_20251231_BloombergMunicipalBondIndex322_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-112472"
      unitRef="pure">0.0234</oef:AvgAnnlRtrPct>
    <dei:DocumentType contextRef="Context_20260228_20260228" id="ixv-112475">485BPOS</dei:DocumentType>
    <dei:DocumentPeriodEndDate contextRef="Context_20260228_20260228" id="ixv-112476">2026-02-28</dei:DocumentPeriodEndDate>
    <dei:EntityCentralIndexKey contextRef="Context_20260228_20260228" id="ixv-112477">0000757010</dei:EntityCentralIndexKey>
    <dei:AmendmentFlag contextRef="Context_20260228_20260228" id="ixv-112478">false</dei:AmendmentFlag>
    <dei:DocumentCreationDate contextRef="Context_20260228_20260228" id="ixv-112479">2026-06-25</dei:DocumentCreationDate>
    <dei:DocumentEffectiveDate contextRef="Context_20260228_20260228" id="ixv-112480">2026-07-01</dei:DocumentEffectiveDate>
    <oef:ShareholderFeesTableTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-112481">~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006932Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006932Member ~</oef:ShareholderFeesTableTextBlock>
    <oef:AnnualFundOperatingExpensesTableTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-112482">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006932Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006932Member ~</oef:AnnualFundOperatingExpensesTableTextBlock>
    <oef:ExpenseExampleWithRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-112483">~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006932Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006932Member ~</oef:ExpenseExampleWithRedemptionTableTextBlock>
    <oef:ExpenseExampleNoRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-112484">~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006932Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006932Member ~</oef:ExpenseExampleNoRedemptionTableTextBlock>
    <oef:PerformanceTableTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-112485">~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006932Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006932Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~</oef:PerformanceTableTextBlock>
    <oef:ShareholderFeesTableTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-112486">~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006933Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006933Member ~</oef:ShareholderFeesTableTextBlock>
    <oef:AnnualFundOperatingExpensesTableTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-112487">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006933Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006933Member ~</oef:AnnualFundOperatingExpensesTableTextBlock>
    <oef:ExpenseExampleWithRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-112488">~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006933Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006933Member ~</oef:ExpenseExampleWithRedemptionTableTextBlock>
    <oef:PerformanceTableTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-112489">~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006933Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006933Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~</oef:PerformanceTableTextBlock>
    <oef:ShareholderFeesTableTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-112490">~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006913Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006913Member ~</oef:ShareholderFeesTableTextBlock>
    <oef:AnnualFundOperatingExpensesTableTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-112491">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006913Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006913Member ~</oef:AnnualFundOperatingExpensesTableTextBlock>
    <oef:ExpenseExampleWithRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-112492">~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006913Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006913Member ~</oef:ExpenseExampleWithRedemptionTableTextBlock>
    <oef:ExpenseExampleNoRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-112493">~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006913Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006913Member ~</oef:ExpenseExampleNoRedemptionTableTextBlock>
    <oef:PerformanceTableTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-112494">~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006913Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006913Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~</oef:PerformanceTableTextBlock>
    <oef:ShareholderFeesTableTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-112495">~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006918Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006918Member ~</oef:ShareholderFeesTableTextBlock>
    <oef:AnnualFundOperatingExpensesTableTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-112496">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006918Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006918Member ~</oef:AnnualFundOperatingExpensesTableTextBlock>
    <oef:ExpenseExampleWithRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-112497">~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006918Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006918Member ~</oef:ExpenseExampleWithRedemptionTableTextBlock>
    <oef:ExpenseExampleNoRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-112498">~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006918Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006918Member ~</oef:ExpenseExampleNoRedemptionTableTextBlock>
    <oef:PerformanceTableTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-112499">~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006918Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006918Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~</oef:PerformanceTableTextBlock>
    <oef:ShareholderFeesTableTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-112500">~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006923Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006923Member ~</oef:ShareholderFeesTableTextBlock>
    <oef:AnnualFundOperatingExpensesTableTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-112501">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006923Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006923Member ~</oef:AnnualFundOperatingExpensesTableTextBlock>
    <oef:ExpenseExampleWithRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-112502">~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006923Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006923Member ~</oef:ExpenseExampleWithRedemptionTableTextBlock>
    <oef:ExpenseExampleNoRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-112503">~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006923Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006923Member ~</oef:ExpenseExampleNoRedemptionTableTextBlock>
    <oef:PerformanceTableTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-112504">~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006923Summary1Member row dei_LegalEntityAxis compact cik0000757010_S000006923Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~</oef:PerformanceTableTextBlock>
    <oef:ShareholderFeesTableTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-112505">~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006911Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006911Member ~</oef:ShareholderFeesTableTextBlock>
    <oef:AnnualFundOperatingExpensesTableTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-112506">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006911Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006911Member ~</oef:AnnualFundOperatingExpensesTableTextBlock>
    <oef:ExpenseExampleWithRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-112507">~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006911Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006911Member ~</oef:ExpenseExampleWithRedemptionTableTextBlock>
    <oef:ExpenseExampleNoRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-112508">~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006911Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006911Member ~</oef:ExpenseExampleNoRedemptionTableTextBlock>
    <oef:PerformanceTableTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-112509">~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006911Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006911Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~</oef:PerformanceTableTextBlock>
    <oef:ShareholderFeesTableTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-112510">~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006912Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006912Member ~</oef:ShareholderFeesTableTextBlock>
    <oef:AnnualFundOperatingExpensesTableTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-112511">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006912Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006912Member ~</oef:AnnualFundOperatingExpensesTableTextBlock>
    <oef:ExpenseExampleWithRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-112512">~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006912Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006912Member ~</oef:ExpenseExampleWithRedemptionTableTextBlock>
    <oef:ExpenseExampleNoRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-112513">~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006912Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006912Member ~</oef:ExpenseExampleNoRedemptionTableTextBlock>
    <oef:PerformanceTableTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-112514">~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006912Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006912Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~</oef:PerformanceTableTextBlock>
    <oef:ShareholderFeesTableTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-112515">~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006916Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006916Member ~</oef:ShareholderFeesTableTextBlock>
    <oef:AnnualFundOperatingExpensesTableTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-112516">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006916Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006916Member ~</oef:AnnualFundOperatingExpensesTableTextBlock>
    <oef:ExpenseExampleWithRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-112517">~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006916Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006916Member ~</oef:ExpenseExampleWithRedemptionTableTextBlock>
    <oef:ExpenseExampleNoRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-112518">~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006916Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006916Member ~</oef:ExpenseExampleNoRedemptionTableTextBlock>
    <oef:PerformanceTableTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-112519">~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006916Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006916Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~</oef:PerformanceTableTextBlock>
    <oef:ShareholderFeesTableTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-112520">~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006917Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006917Member ~</oef:ShareholderFeesTableTextBlock>
    <oef:AnnualFundOperatingExpensesTableTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-112521">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006917Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006917Member ~</oef:AnnualFundOperatingExpensesTableTextBlock>
    <oef:ExpenseExampleWithRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-112522">~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006917Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006917Member ~</oef:ExpenseExampleWithRedemptionTableTextBlock>
    <oef:ExpenseExampleNoRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-112523">~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006917Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006917Member ~</oef:ExpenseExampleNoRedemptionTableTextBlock>
    <oef:PerformanceTableTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-112524">~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006917Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006917Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~</oef:PerformanceTableTextBlock>
    <oef:ShareholderFeesTableTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-112525">~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006921Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006921Member ~</oef:ShareholderFeesTableTextBlock>
    <oef:AnnualFundOperatingExpensesTableTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-112526">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006921Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006921Member ~</oef:AnnualFundOperatingExpensesTableTextBlock>
    <oef:ExpenseExampleWithRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-112527">~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006921Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006921Member ~</oef:ExpenseExampleWithRedemptionTableTextBlock>
    <oef:ExpenseExampleNoRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-112528">~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006921Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006921Member ~</oef:ExpenseExampleNoRedemptionTableTextBlock>
    <oef:PerformanceTableTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-112529">~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006921Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006921Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~</oef:PerformanceTableTextBlock>
    <oef:ShareholderFeesTableTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-112530">~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006924Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006924Member ~</oef:ShareholderFeesTableTextBlock>
    <oef:AnnualFundOperatingExpensesTableTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-112531">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006924Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006924Member ~</oef:AnnualFundOperatingExpensesTableTextBlock>
    <oef:ExpenseExampleWithRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-112532">~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006924Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006924Member ~</oef:ExpenseExampleWithRedemptionTableTextBlock>
    <oef:ExpenseExampleNoRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-112533">~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006924Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006924Member ~</oef:ExpenseExampleNoRedemptionTableTextBlock>
    <oef:PerformanceTableTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-112534">~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006924Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006924Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~</oef:PerformanceTableTextBlock>
    <oef:ShareholderFeesTableTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-112535">~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006928Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006928Member ~</oef:ShareholderFeesTableTextBlock>
    <oef:AnnualFundOperatingExpensesTableTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-112536">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006928Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006928Member ~</oef:AnnualFundOperatingExpensesTableTextBlock>
    <oef:ExpenseExampleWithRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-112537">~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006928Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006928Member ~</oef:ExpenseExampleWithRedemptionTableTextBlock>
    <oef:ExpenseExampleNoRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-112538">~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006928Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006928Member ~</oef:ExpenseExampleNoRedemptionTableTextBlock>
    <oef:PerformanceTableTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-112539">~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006928Summary2Member row dei_LegalEntityAxis compact cik0000757010_S000006928Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~</oef:PerformanceTableTextBlock>
    <oef:ShareholderFeesTableTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-112540">~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006922Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006922Member ~</oef:ShareholderFeesTableTextBlock>
    <oef:AnnualFundOperatingExpensesTableTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-112541">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006922Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006922Member ~</oef:AnnualFundOperatingExpensesTableTextBlock>
    <oef:ExpenseExampleWithRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-112542">~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006922Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006922Member ~</oef:ExpenseExampleWithRedemptionTableTextBlock>
    <oef:ExpenseExampleNoRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-112543">~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006922Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006922Member ~</oef:ExpenseExampleNoRedemptionTableTextBlock>
    <oef:PerformanceTableTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-112544">~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006922Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006922Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~</oef:PerformanceTableTextBlock>
    <oef:ShareholderFeesTableTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-112545">~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006929Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006929Member ~</oef:ShareholderFeesTableTextBlock>
    <oef:AnnualFundOperatingExpensesTableTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-112546">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006929Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006929Member ~</oef:AnnualFundOperatingExpensesTableTextBlock>
    <oef:ExpenseExampleWithRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-112547">~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006929Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006929Member ~</oef:ExpenseExampleWithRedemptionTableTextBlock>
    <oef:ExpenseExampleNoRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-112548">~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006929Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006929Member ~</oef:ExpenseExampleNoRedemptionTableTextBlock>
    <oef:PerformanceTableTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-112549">~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006929Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006929Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~</oef:PerformanceTableTextBlock>
    <oef:ShareholderFeesTableTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-112550">~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006930Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006930Member ~</oef:ShareholderFeesTableTextBlock>
    <oef:AnnualFundOperatingExpensesTableTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-112551">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006930Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006930Member ~</oef:AnnualFundOperatingExpensesTableTextBlock>
    <oef:ExpenseExampleWithRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-112552">~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006930Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006930Member ~</oef:ExpenseExampleWithRedemptionTableTextBlock>
    <oef:ExpenseExampleNoRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-112553">~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006930Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006930Member ~</oef:ExpenseExampleNoRedemptionTableTextBlock>
    <oef:PerformanceTableTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-112554">~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006930Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006930Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~</oef:PerformanceTableTextBlock>
    <oef:ShareholderFeesTableTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-112555">~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006919Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006919Member ~</oef:ShareholderFeesTableTextBlock>
    <oef:AnnualFundOperatingExpensesTableTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-112556">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006919Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006919Member ~</oef:AnnualFundOperatingExpensesTableTextBlock>
    <oef:ExpenseExampleWithRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-112557">~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006919Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006919Member ~</oef:ExpenseExampleWithRedemptionTableTextBlock>
    <oef:ExpenseExampleNoRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-112558">~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006919Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006919Member ~</oef:ExpenseExampleNoRedemptionTableTextBlock>
    <oef:PerformanceTableTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-112559">~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006919Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006919Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~</oef:PerformanceTableTextBlock>
    <oef:ShareholderFeesTableTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112560">~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006920Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006920Member ~</oef:ShareholderFeesTableTextBlock>
    <oef:AnnualFundOperatingExpensesTableTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112561">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006920Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006920Member ~</oef:AnnualFundOperatingExpensesTableTextBlock>
    <oef:ExpenseExampleWithRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112562">~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006920Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006920Member ~</oef:ExpenseExampleWithRedemptionTableTextBlock>
    <oef:ExpenseExampleNoRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112563">~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006920Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006920Member ~</oef:ExpenseExampleNoRedemptionTableTextBlock>
    <oef:PerformanceTableTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-112564">~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006920Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006920Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~</oef:PerformanceTableTextBlock>
    <oef:ShareholderFeesTableTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112565">~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006925Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006925Member ~</oef:ShareholderFeesTableTextBlock>
    <oef:AnnualFundOperatingExpensesTableTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112566">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006925Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006925Member ~</oef:AnnualFundOperatingExpensesTableTextBlock>
    <oef:ExpenseExampleWithRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112567">~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006925Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006925Member ~</oef:ExpenseExampleWithRedemptionTableTextBlock>
    <oef:ExpenseExampleNoRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112568">~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006925Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006925Member ~</oef:ExpenseExampleNoRedemptionTableTextBlock>
    <oef:PerformanceTableTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-112569">~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006925Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006925Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~</oef:PerformanceTableTextBlock>
    <oef:ShareholderFeesTableTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112570">~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006926Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006926Member ~</oef:ShareholderFeesTableTextBlock>
    <oef:AnnualFundOperatingExpensesTableTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112571">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006926Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006926Member ~</oef:AnnualFundOperatingExpensesTableTextBlock>
    <oef:ExpenseExampleWithRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112572">~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006926Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006926Member ~</oef:ExpenseExampleWithRedemptionTableTextBlock>
    <oef:ExpenseExampleNoRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112573">~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006926Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006926Member ~</oef:ExpenseExampleNoRedemptionTableTextBlock>
    <oef:PerformanceTableTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-112574">~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006926Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006926Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~</oef:PerformanceTableTextBlock>
    <oef:ShareholderFeesTableTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112575">~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006927Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006927Member ~</oef:ShareholderFeesTableTextBlock>
    <oef:AnnualFundOperatingExpensesTableTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112576">~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006927Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006927Member ~</oef:AnnualFundOperatingExpensesTableTextBlock>
    <oef:ExpenseExampleWithRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112577">~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006927Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006927Member ~</oef:ExpenseExampleWithRedemptionTableTextBlock>
    <oef:ExpenseExampleNoRedemptionTableTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112578">~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006927Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006927Member ~</oef:ExpenseExampleNoRedemptionTableTextBlock>
    <oef:PerformanceTableTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-112579">~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000757010_S000006927Summary3Member row dei_LegalEntityAxis compact cik0000757010_S000006927Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~</oef:PerformanceTableTextBlock>
    <oef:AnnlRtrPct
      contextRef="Context_20161231_20161231_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-123827"
      unitRef="pure">-0.0058</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20171231_20171231_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-123828"
      unitRef="pure">0.0342</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20181231_20181231_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-123829"
      unitRef="pure">0.0071</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20191231_20191231_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-123830"
      unitRef="pure">0.0468</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20201231_20201231_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-123831"
      unitRef="pure">0.0424</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20211231_20211231_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-123832"
      unitRef="pure">0.0062</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20221231_20221231_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-123833"
      unitRef="pure">-0.0822</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20231231_20231231_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-123834"
      unitRef="pure">0.0556</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20241231_20241231_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-123835"
      unitRef="pure">0.0232</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20251231_20251231_C000205910Member_S000006932Member_S000006932Summary1Member"
      decimals="INF"
      id="ixv-123836"
      unitRef="pure">0.0469</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20161231_20161231_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-123837"
      unitRef="pure">0.0005</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20171231_20171231_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-123838"
      unitRef="pure">0.0038</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20181231_20181231_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-123839"
      unitRef="pure">0.0126</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20191231_20191231_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-123840"
      unitRef="pure">0.0345</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20201231_20201231_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-123841"
      unitRef="pure">0.0275</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20211231_20211231_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-123842"
      unitRef="pure">-0.0032</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20221231_20221231_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-123843"
      unitRef="pure">-0.0369</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20231231_20231231_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-123844"
      unitRef="pure">0.0399</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20241231_20241231_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-123845"
      unitRef="pure">0.0326</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20251231_20251231_C000205911Member_S000006933Member_S000006933Summary1Member"
      decimals="INF"
      id="ixv-123846"
      unitRef="pure">0.0402</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20161231_20161231_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-123847"
      unitRef="pure">0.0114</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20171231_20171231_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-123848"
      unitRef="pure">0.0377</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20181231_20181231_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-123849"
      unitRef="pure">0.0188</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20191231_20191231_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-123850"
      unitRef="pure">0.0758</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20201231_20201231_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-123851"
      unitRef="pure">0.0559</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20211231_20211231_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-123852"
      unitRef="pure">0.0479</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20221231_20221231_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-123853"
      unitRef="pure">-0.1409</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20231231_20231231_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-123854"
      unitRef="pure">0.0627</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20241231_20241231_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-123855"
      unitRef="pure">0.0624</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20251231_20251231_C000199703Member_S000006913Member_S000006913Summary1Member"
      decimals="INF"
      id="ixv-123856"
      unitRef="pure">0.0395</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20161231_20161231_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-123857"
      unitRef="pure">0.0102</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20171231_20171231_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-123858"
      unitRef="pure">0.0463</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20181231_20181231_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-123859"
      unitRef="pure">-0.0016</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20191231_20191231_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-123860"
      unitRef="pure">0.0664</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20201231_20201231_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-123861"
      unitRef="pure">0.0443</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20211231_20211231_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-123862"
      unitRef="pure">0.0074</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20221231_20221231_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-123863"
      unitRef="pure">-0.1105</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20231231_20231231_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-123864"
      unitRef="pure">0.055</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20241231_20241231_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-123865"
      unitRef="pure">0.0125</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20251231_20251231_C000205897Member_S000006918Member_S000006918Summary1Member"
      decimals="INF"
      id="ixv-123866"
      unitRef="pure">0.027</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20161231_20161231_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-123867"
      unitRef="pure">0.0159</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20171231_20171231_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-123868"
      unitRef="pure">0.0262</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20181231_20181231_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-123869"
      unitRef="pure">0.0166</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20191231_20191231_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-123870"
      unitRef="pure">0.0636</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20201231_20201231_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-123871"
      unitRef="pure">0.0377</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20211231_20211231_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-123872"
      unitRef="pure">0.0233</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20221231_20221231_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-123873"
      unitRef="pure">-0.1091</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20231231_20231231_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-123874"
      unitRef="pure">0.0635</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20241231_20241231_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-123875"
      unitRef="pure">0.0229</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20251231_20251231_C000205902Member_S000006923Member_S000006923Summary1Member"
      decimals="INF"
      id="ixv-123876"
      unitRef="pure">0.031</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20161231_20161231_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-123877"
      unitRef="pure">0.0187</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20171231_20171231_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-123878"
      unitRef="pure">0.0297</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20181231_20181231_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-123879"
      unitRef="pure">0.0059</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20191231_20191231_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-123880"
      unitRef="pure">0.0627</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20201231_20201231_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-123881"
      unitRef="pure">0.0457</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20211231_20211231_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-123882"
      unitRef="pure">0.0206</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20221231_20221231_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-123883"
      unitRef="pure">-0.1093</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20231231_20231231_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-123884"
      unitRef="pure">0.0622</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20241231_20241231_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-123885"
      unitRef="pure">0.014</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20251231_20251231_C000205892Member_S000006911Member_S000006911Summary2Member"
      decimals="INF"
      id="ixv-123886"
      unitRef="pure">0.03</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20161231_20161231_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-123887"
      unitRef="pure">0.012</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20171231_20171231_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-123888"
      unitRef="pure">0.0247</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20181231_20181231_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-123889"
      unitRef="pure">0.0053</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20191231_20191231_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-123890"
      unitRef="pure">0.0609</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20201231_20201231_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-123891"
      unitRef="pure">0.0426</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20211231_20211231_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-123892"
      unitRef="pure">0.0147</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20221231_20221231_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-123893"
      unitRef="pure">-0.1141</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20231231_20231231_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-123894"
      unitRef="pure">0.0652</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20241231_20241231_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-123895"
      unitRef="pure">0.0172</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20251231_20251231_C000205893Member_S000006912Member_S000006912Summary2Member"
      decimals="INF"
      id="ixv-123896"
      unitRef="pure">0.0293</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20161231_20161231_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-123897"
      unitRef="pure">0.0063</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20171231_20171231_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-123898"
      unitRef="pure">0.033</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20181231_20181231_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-123899"
      unitRef="pure">0.0108</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20191231_20191231_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-123900"
      unitRef="pure">0.0664</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20201231_20201231_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-123901"
      unitRef="pure">0.0416</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20211231_20211231_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-123902"
      unitRef="pure">0.0205</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20221231_20221231_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-123903"
      unitRef="pure">-0.1099</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20231231_20231231_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-123904"
      unitRef="pure">0.0602</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20241231_20241231_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-123905"
      unitRef="pure">0.0211</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20251231_20251231_C000205895Member_S000006916Member_S000006916Summary2Member"
      decimals="INF"
      id="ixv-123906"
      unitRef="pure">0.0236</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20161231_20161231_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-123907"
      unitRef="pure">0.0114</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20171231_20171231_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-123908"
      unitRef="pure">0.0287</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20181231_20181231_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-123909"
      unitRef="pure">0.0115</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20191231_20191231_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-123910"
      unitRef="pure">0.0613</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20201231_20201231_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-123911"
      unitRef="pure">0.0348</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20211231_20211231_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-123912"
      unitRef="pure">0.015</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20221231_20221231_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-123913"
      unitRef="pure">-0.1022</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20231231_20231231_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-123914"
      unitRef="pure">0.0599</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20241231_20241231_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-123915"
      unitRef="pure">0.0195</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20251231_20251231_C000205896Member_S000006917Member_S000006917Summary2Member"
      decimals="INF"
      id="ixv-123916"
      unitRef="pure">0.0241</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20161231_20161231_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-123917"
      unitRef="pure">0.0135</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20171231_20171231_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-123918"
      unitRef="pure">0.0215</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20181231_20181231_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-123919"
      unitRef="pure">0.014</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20191231_20191231_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-123920"
      unitRef="pure">0.0649</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20201231_20201231_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-123921"
      unitRef="pure">0.0446</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20211231_20211231_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-123922"
      unitRef="pure">0.0158</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20221231_20221231_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-123923"
      unitRef="pure">-0.1148</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20231231_20231231_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-123924"
      unitRef="pure">0.058</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20241231_20241231_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-123925"
      unitRef="pure">0.0245</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20251231_20251231_C000205900Member_S000006921Member_S000006921Summary2Member"
      decimals="INF"
      id="ixv-123926"
      unitRef="pure">0.0321</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20161231_20161231_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-123927"
      unitRef="pure">0.0114</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20171231_20171231_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-123928"
      unitRef="pure">0.0155</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20181231_20181231_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-123929"
      unitRef="pure">0.0121</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20191231_20191231_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-123930"
      unitRef="pure">0.0581</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20201231_20201231_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-123931"
      unitRef="pure">0.0442</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20211231_20211231_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-123932"
      unitRef="pure">0.0119</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20221231_20221231_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-123933"
      unitRef="pure">-0.1105</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20231231_20231231_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-123934"
      unitRef="pure">0.0588</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20241231_20241231_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-123935"
      unitRef="pure">0.0191</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20251231_20251231_C000205903Member_S000006924Member_S000006924Summary2Member"
      decimals="INF"
      id="ixv-123936"
      unitRef="pure">0.0328</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20161231_20161231_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-123937"
      unitRef="pure">0.0178</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20171231_20171231_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-123938"
      unitRef="pure">0.0151</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20181231_20181231_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-123939"
      unitRef="pure">0.0122</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20191231_20191231_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-123940"
      unitRef="pure">0.0575</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20201231_20201231_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-123941"
      unitRef="pure">0.0366</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20211231_20211231_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-123942"
      unitRef="pure">0.0064</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20221231_20221231_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-123943"
      unitRef="pure">-0.1148</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20231231_20231231_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-123944"
      unitRef="pure">0.0591</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20241231_20241231_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-123945"
      unitRef="pure">0.0224</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20251231_20251231_C000205907Member_S000006928Member_S000006928Summary2Member"
      decimals="INF"
      id="ixv-123946"
      unitRef="pure">0.0203</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20161231_20161231_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-123947"
      unitRef="pure">0.01</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20171231_20171231_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-123948"
      unitRef="pure">0.0405</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20181231_20181231_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-123949"
      unitRef="pure">0.0086</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20191231_20191231_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-123950"
      unitRef="pure">0.0684</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20201231_20201231_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-123951"
      unitRef="pure">0.0431</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20211231_20211231_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-123952"
      unitRef="pure">0.0142</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20221231_20221231_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-123953"
      unitRef="pure">-0.1051</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20231231_20231231_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-123954"
      unitRef="pure">0.0598</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20241231_20241231_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-123955"
      unitRef="pure">0.0237</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20251231_20251231_C000205901Member_S000006922Member_S000006922Summary3Member"
      decimals="INF"
      id="ixv-123956"
      unitRef="pure">0.0303</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20161231_20161231_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-123957"
      unitRef="pure">0.0139</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20171231_20171231_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-123958"
      unitRef="pure">0.0277</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20181231_20181231_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-123959"
      unitRef="pure">0.0104</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20191231_20191231_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-123960"
      unitRef="pure">0.064</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20201231_20201231_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-123961"
      unitRef="pure">0.0471</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20211231_20211231_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-123962"
      unitRef="pure">0.015</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20221231_20221231_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-123963"
      unitRef="pure">-0.1098</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20231231_20231231_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-123964"
      unitRef="pure">0.0608</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20241231_20241231_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-123965"
      unitRef="pure">0.0247</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20251231_20251231_C000205908Member_S000006929Member_S000006929Summary3Member"
      decimals="INF"
      id="ixv-123966"
      unitRef="pure">0.0333</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20161231_20161231_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-123967"
      unitRef="pure">0.0112</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20171231_20171231_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-123968"
      unitRef="pure">0.0193</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20181231_20181231_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-123969"
      unitRef="pure">0.0092</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20191231_20191231_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-123970"
      unitRef="pure">0.0497</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20201231_20201231_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-123971"
      unitRef="pure">0.0386</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20211231_20211231_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-123972"
      unitRef="pure">0.0137</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20221231_20221231_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-123973"
      unitRef="pure">-0.1156</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20231231_20231231_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-123974"
      unitRef="pure">0.0645</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20241231_20241231_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-123975"
      unitRef="pure">0.0178</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20251231_20251231_C000205909Member_S000006930Member_S000006930Summary3Member"
      decimals="INF"
      id="ixv-123976"
      unitRef="pure">0.0351</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20161231_20161231_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-123977"
      unitRef="pure">0.0125</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20171231_20171231_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-123978"
      unitRef="pure">0.0331</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20181231_20181231_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-123979"
      unitRef="pure">0.0087</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20191231_20191231_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-123980"
      unitRef="pure">0.072</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20201231_20201231_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-123981"
      unitRef="pure">0.0503</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20211231_20211231_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-123982"
      unitRef="pure">0.0083</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20221231_20221231_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-123983"
      unitRef="pure">-0.1078</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20231231_20231231_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-123984"
      unitRef="pure">0.0581</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20241231_20241231_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-123985"
      unitRef="pure">0.0196</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20251231_20251231_C000205898Member_S000006919Member_S000006919Summary3Member"
      decimals="INF"
      id="ixv-123986"
      unitRef="pure">0.031</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20161231_20161231_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-123987"
      unitRef="pure">0.0026</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20171231_20171231_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-123988"
      unitRef="pure">0.0393</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20181231_20181231_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-123989"
      unitRef="pure">0.0026</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20191231_20191231_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-123990"
      unitRef="pure">0.066</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20201231_20201231_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-123991"
      unitRef="pure">0.0497</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20211231_20211231_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-123992"
      unitRef="pure">0.0044</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20221231_20221231_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-123993"
      unitRef="pure">-0.1081</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20231231_20231231_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-123994"
      unitRef="pure">0.0547</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20241231_20241231_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-123995"
      unitRef="pure">0.0138</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20251231_20251231_C000205899Member_S000006920Member_S000006920Summary3Member"
      decimals="INF"
      id="ixv-123996"
      unitRef="pure">0.0415</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20161231_20161231_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-123997"
      unitRef="pure">0.0093</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20171231_20171231_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-123998"
      unitRef="pure">0.0464</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20181231_20181231_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-123999"
      unitRef="pure">0.0068</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20191231_20191231_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-124000"
      unitRef="pure">0.0656</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20201231_20201231_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-124001"
      unitRef="pure">0.049</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20211231_20211231_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-124002"
      unitRef="pure">0.0071</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20221231_20221231_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-124003"
      unitRef="pure">-0.1115</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20231231_20231231_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-124004"
      unitRef="pure">0.0554</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20241231_20241231_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-124005"
      unitRef="pure">0.0206</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20251231_20251231_C000205904Member_S000006925Member_S000006925Summary3Member"
      decimals="INF"
      id="ixv-124006"
      unitRef="pure">0.0339</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20161231_20161231_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-124007"
      unitRef="pure">0.0098</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20171231_20171231_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-124008"
      unitRef="pure">0.0373</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20181231_20181231_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-124009"
      unitRef="pure">0.0067</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20191231_20191231_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-124010"
      unitRef="pure">0.0619</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20201231_20201231_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-124011"
      unitRef="pure">0.0483</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20211231_20211231_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-124012"
      unitRef="pure">0.0119</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20221231_20221231_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-124013"
      unitRef="pure">-0.1074</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20231231_20231231_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-124014"
      unitRef="pure">0.0536</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20241231_20241231_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-124015"
      unitRef="pure">0.0192</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20251231_20251231_C000205905Member_S000006926Member_S000006926Summary3Member"
      decimals="INF"
      id="ixv-124016"
      unitRef="pure">0.0328</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20161231_20161231_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-124017"
      unitRef="pure">0.0179</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20171231_20171231_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-124018"
      unitRef="pure">0.0239</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20181231_20181231_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-124019"
      unitRef="pure">0.0134</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20191231_20191231_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-124020"
      unitRef="pure">0.0526</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20201231_20201231_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-124021"
      unitRef="pure">0.0421</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20211231_20211231_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-124022"
      unitRef="pure">0.0175</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20221231_20221231_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-124023"
      unitRef="pure">-0.1183</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20231231_20231231_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-124024"
      unitRef="pure">0.063</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20241231_20241231_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-124025"
      unitRef="pure">0.0205</oef:AnnlRtrPct>
    <oef:AnnlRtrPct
      contextRef="Context_20251231_20251231_C000205906Member_S000006927Member_S000006927Summary3Member"
      decimals="INF"
      id="ixv-124026"
      unitRef="pure">0.0299</oef:AnnlRtrPct>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000205910Member_S000006932Member_S000006932Summary1Member"
      id="ixv-124027">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000018802Member_S000006932Member_S000006932Summary1Member"
      id="ixv-124028">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000018803Member_S000006932Member_S000006932Summary1Member"
      id="ixv-124029">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000194372Member_S000006932Member_S000006932Summary1Member"
      id="ixv-124030">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000074134Member_S000006932Member_S000006932Summary1Member"
      id="ixv-124031">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:PerfInceptionDate
      contextRef="Context_20170801_20251231_C000194372Member_S000006932Member_S000006932Summary1Member"
      id="ixv-124032">2017-08-01</oef:PerfInceptionDate>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000205911Member_S000006933Member_S000006933Summary1Member"
      id="ixv-124033">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000018804Member_S000006933Member_S000006933Summary1Member"
      id="ixv-124034">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000194373Member_S000006933Member_S000006933Summary1Member"
      id="ixv-124035">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000096868Member_S000006933Member_S000006933Summary1Member"
      id="ixv-124036">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:PerfInceptionDate
      contextRef="Context_20170801_20251231_C000194373Member_S000006933Member_S000006933Summary1Member"
      id="ixv-124037">2017-08-01</oef:PerfInceptionDate>
    <oef:PerfInceptionDate
      contextRef="Context_20170801_20251231_C000194355Member_S000006913Member_S000006913Summary1Member"
      id="ixv-124038">2017-08-01</oef:PerfInceptionDate>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000205897Member_S000006918Member_S000006918Summary1Member"
      id="ixv-124039">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000018769Member_S000006918Member_S000006918Summary1Member"
      id="ixv-124040">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000018770Member_S000006918Member_S000006918Summary1Member"
      id="ixv-124041">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000194359Member_S000006918Member_S000006918Summary1Member"
      id="ixv-124042">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000079636Member_S000006918Member_S000006918Summary1Member"
      id="ixv-124043">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:PerfInceptionDate
      contextRef="Context_20170801_20251231_C000194359Member_S000006918Member_S000006918Summary1Member"
      id="ixv-124044">2017-08-01</oef:PerfInceptionDate>
    <oef:PerfInceptionDate
      contextRef="Context_20170801_20251231_C000194364Member_S000006923Member_S000006923Summary1Member"
      id="ixv-124045">2017-08-01</oef:PerfInceptionDate>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000205892Member_S000006911Member_S000006911Summary2Member"
      id="ixv-124046">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000018753Member_S000006911Member_S000006911Summary2Member"
      id="ixv-124047">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000018754Member_S000006911Member_S000006911Summary2Member"
      id="ixv-124048">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000194353Member_S000006911Member_S000006911Summary2Member"
      id="ixv-124049">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000173665Member_S000006911Member_S000006911Summary2Member"
      id="ixv-124050">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:PerfInceptionDate
      contextRef="Context_20170801_20251231_C000194353Member_S000006911Member_S000006911Summary2Member"
      id="ixv-124051">2017-08-01</oef:PerfInceptionDate>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000205893Member_S000006912Member_S000006912Summary2Member"
      id="ixv-124052">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000018755Member_S000006912Member_S000006912Summary2Member"
      id="ixv-124053">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000018756Member_S000006912Member_S000006912Summary2Member"
      id="ixv-124054">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000194354Member_S000006912Member_S000006912Summary2Member"
      id="ixv-124055">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000173666Member_S000006912Member_S000006912Summary2Member"
      id="ixv-124056">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:PerfInceptionDate
      contextRef="Context_20170801_20251231_C000194354Member_S000006912Member_S000006912Summary2Member"
      id="ixv-124057">2017-08-01</oef:PerfInceptionDate>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000205895Member_S000006916Member_S000006916Summary2Member"
      id="ixv-124058">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000018765Member_S000006916Member_S000006916Summary2Member"
      id="ixv-124059">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000018766Member_S000006916Member_S000006916Summary2Member"
      id="ixv-124060">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000194357Member_S000006916Member_S000006916Summary2Member"
      id="ixv-124061">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000173668Member_S000006916Member_S000006916Summary2Member"
      id="ixv-124062">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:PerfInceptionDate
      contextRef="Context_20170801_20251231_C000194357Member_S000006916Member_S000006916Summary2Member"
      id="ixv-124063">2017-08-01</oef:PerfInceptionDate>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000205896Member_S000006917Member_S000006917Summary2Member"
      id="ixv-124064">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000018767Member_S000006917Member_S000006917Summary2Member"
      id="ixv-124065">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000018768Member_S000006917Member_S000006917Summary2Member"
      id="ixv-124066">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000194358Member_S000006917Member_S000006917Summary2Member"
      id="ixv-124067">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000079635Member_S000006917Member_S000006917Summary2Member"
      id="ixv-124068">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:PerfInceptionDate
      contextRef="Context_20170801_20251231_C000194358Member_S000006917Member_S000006917Summary2Member"
      id="ixv-124069">2017-08-01</oef:PerfInceptionDate>
    <oef:PerfInceptionDate
      contextRef="Context_20170801_20251231_C000194362Member_S000006921Member_S000006921Summary2Member"
      id="ixv-124070">2017-08-01</oef:PerfInceptionDate>
    <oef:PerfInceptionDate
      contextRef="Context_20170801_20251231_C000194365Member_S000006924Member_S000006924Summary2Member"
      id="ixv-124071">2017-08-01</oef:PerfInceptionDate>
    <oef:PerfInceptionDate
      contextRef="Context_20170801_20251231_C000194369Member_S000006928Member_S000006928Summary2Member"
      id="ixv-124072">2017-08-01</oef:PerfInceptionDate>
    <oef:PerfInceptionDate
      contextRef="Context_20170801_20251231_C000194363Member_S000006922Member_S000006922Summary3Member"
      id="ixv-124073">2017-08-01</oef:PerfInceptionDate>
    <oef:PerfInceptionDate
      contextRef="Context_20170801_20251231_C000194370Member_S000006929Member_S000006929Summary3Member"
      id="ixv-124074">2017-08-01</oef:PerfInceptionDate>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000205909Member_S000006930Member_S000006930Summary3Member"
      id="ixv-124075">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000018798Member_S000006930Member_S000006930Summary3Member"
      id="ixv-124076">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000018799Member_S000006930Member_S000006930Summary3Member"
      id="ixv-124077">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000194371Member_S000006930Member_S000006930Summary3Member"
      id="ixv-124078">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination
      contextRef="Context_20260228_20260228_C000079644Member_S000006930Member_S000006930Summary3Member"
      id="ixv-124079">June 30, 2027</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:PerfInceptionDate
      contextRef="Context_20170801_20251231_C000194371Member_S000006930Member_S000006930Summary3Member"
      id="ixv-124080">2017-08-01</oef:PerfInceptionDate>
    <oef:PerfInceptionDate
      contextRef="Context_20170801_20251231_C000194360Member_S000006919Member_S000006919Summary3Member"
      id="ixv-124081">2017-08-01</oef:PerfInceptionDate>
    <oef:PerfInceptionDate
      contextRef="Context_20170801_20251231_C000194361Member_S000006920Member_S000006920Summary3Member"
      id="ixv-124082">2017-08-01</oef:PerfInceptionDate>
    <oef:PerfInceptionDate
      contextRef="Context_20170801_20251231_C000194366Member_S000006925Member_S000006925Summary3Member"
      id="ixv-124083">2017-08-01</oef:PerfInceptionDate>
    <oef:PerfInceptionDate
      contextRef="Context_20170801_20251231_C000194367Member_S000006926Member_S000006926Summary3Member"
      id="ixv-124084">2017-08-01</oef:PerfInceptionDate>
    <oef:PerfInceptionDate
      contextRef="Context_20170801_20251231_C000194368Member_S000006927Member_S000006927Summary3Member"
      id="ixv-124085">2017-08-01</oef:PerfInceptionDate>
    <cik0000757010:CustomRisksTableTextBlock
      contextRef="Context_20260228_20260228_S000006932Member_S000006932Summary1Member"
      id="ixv-124146">~ http://franklintempleton.com/20260228/role/RRRiskTable3 ~</cik0000757010:CustomRisksTableTextBlock>
    <cik0000757010:CustomRisksTableTextBlock
      contextRef="Context_20260228_20260228_S000006933Member_S000006933Summary1Member"
      id="ixv-124147">~ http://franklintempleton.com/20260228/role/RRRiskTable5 ~</cik0000757010:CustomRisksTableTextBlock>
    <cik0000757010:CustomRisksTableTextBlock
      contextRef="Context_20260228_20260228_S000006913Member_S000006913Summary1Member"
      id="ixv-124148">~ http://franklintempleton.com/20260228/role/RRRiskTable7 ~</cik0000757010:CustomRisksTableTextBlock>
    <cik0000757010:CustomRisksTableTextBlock
      contextRef="Context_20260228_20260228_S000006918Member_S000006918Summary1Member"
      id="ixv-124149">~ http://franklintempleton.com/20260228/role/RRRiskTable9 ~</cik0000757010:CustomRisksTableTextBlock>
    <cik0000757010:CustomRisksTableTextBlock
      contextRef="Context_20260228_20260228_S000006923Member_S000006923Summary1Member"
      id="ixv-124150">~ http://franklintempleton.com/20260228/role/RRRiskTable11 ~</cik0000757010:CustomRisksTableTextBlock>
    <cik0000757010:CustomRisksTableTextBlock
      contextRef="Context_20260228_20260228_S000006911Member_S000006911Summary2Member"
      id="ixv-124151">~ http://franklintempleton.com/20260228/role/RRRiskTable13 ~</cik0000757010:CustomRisksTableTextBlock>
    <cik0000757010:CustomRisksTableTextBlock
      contextRef="Context_20260228_20260228_S000006912Member_S000006912Summary2Member"
      id="ixv-124152">~ http://franklintempleton.com/20260228/role/RRRiskTable15 ~</cik0000757010:CustomRisksTableTextBlock>
    <cik0000757010:CustomRisksTableTextBlock
      contextRef="Context_20260228_20260228_S000006916Member_S000006916Summary2Member"
      id="ixv-124153">~ http://franklintempleton.com/20260228/role/RRRiskTable17 ~</cik0000757010:CustomRisksTableTextBlock>
    <cik0000757010:CustomRisksTableTextBlock
      contextRef="Context_20260228_20260228_S000006917Member_S000006917Summary2Member"
      id="ixv-124154">~ http://franklintempleton.com/20260228/role/RRRiskTable19 ~</cik0000757010:CustomRisksTableTextBlock>
    <cik0000757010:CustomRisksTableTextBlock
      contextRef="Context_20260228_20260228_S000006921Member_S000006921Summary2Member"
      id="ixv-124155">~ http://franklintempleton.com/20260228/role/RRRiskTable21 ~</cik0000757010:CustomRisksTableTextBlock>
    <cik0000757010:CustomRisksTableTextBlock
      contextRef="Context_20260228_20260228_S000006924Member_S000006924Summary2Member"
      id="ixv-124156">~ http://franklintempleton.com/20260228/role/RRRiskTable23 ~</cik0000757010:CustomRisksTableTextBlock>
    <cik0000757010:CustomRisksTableTextBlock
      contextRef="Context_20260228_20260228_S000006928Member_S000006928Summary2Member"
      id="ixv-124157">~ http://franklintempleton.com/20260228/role/RRRiskTable25 ~</cik0000757010:CustomRisksTableTextBlock>
    <cik0000757010:CustomRisksTableTextBlock
      contextRef="Context_20260228_20260228_S000006922Member_S000006922Summary3Member"
      id="ixv-124158">~ http://franklintempleton.com/20260228/role/RRRiskTable27 ~</cik0000757010:CustomRisksTableTextBlock>
    <cik0000757010:CustomRisksTableTextBlock
      contextRef="Context_20260228_20260228_S000006929Member_S000006929Summary3Member"
      id="ixv-124159">~ http://franklintempleton.com/20260228/role/RRRiskTable29 ~</cik0000757010:CustomRisksTableTextBlock>
    <cik0000757010:CustomRisksTableTextBlock
      contextRef="Context_20260228_20260228_S000006930Member_S000006930Summary3Member"
      id="ixv-124160">~ http://franklintempleton.com/20260228/role/RRRiskTable31 ~</cik0000757010:CustomRisksTableTextBlock>
    <cik0000757010:CustomRisksTableTextBlock
      contextRef="Context_20260228_20260228_S000006919Member_S000006919Summary3Member"
      id="ixv-124161">~ http://franklintempleton.com/20260228/role/RRRiskTable33 ~</cik0000757010:CustomRisksTableTextBlock>
    <cik0000757010:CustomRisksTableTextBlock
      contextRef="Context_20260228_20260228_S000006920Member_S000006920Summary3Member"
      id="ixv-124162">~ http://franklintempleton.com/20260228/role/RRRiskTable35 ~</cik0000757010:CustomRisksTableTextBlock>
    <cik0000757010:CustomRisksTableTextBlock
      contextRef="Context_20260228_20260228_S000006925Member_S000006925Summary3Member"
      id="ixv-124163">~ http://franklintempleton.com/20260228/role/RRRiskTable37 ~</cik0000757010:CustomRisksTableTextBlock>
    <cik0000757010:CustomRisksTableTextBlock
      contextRef="Context_20260228_20260228_S000006926Member_S000006926Summary3Member"
      id="ixv-124164">~ http://franklintempleton.com/20260228/role/RRRiskTable39 ~</cik0000757010:CustomRisksTableTextBlock>
    <cik0000757010:CustomRisksTableTextBlock
      contextRef="Context_20260228_20260228_S000006927Member_S000006927Summary3Member"
      id="ixv-124165">~ http://franklintempleton.com/20260228/role/RRRiskTable41 ~</cik0000757010:CustomRisksTableTextBlock>
    <link:footnoteLink
      xlink:role="http://www.xbrl.org/2003/role/link"
      xlink:type="extended">
        <link:loc xlink:href="#_24_" xlink:label="_24_" xlink:type="locator"/>
        <link:loc xlink:href="#_25_" xlink:label="_25_" xlink:type="locator"/>
        <link:footnote id="fn1_" xlink:label="fn1_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">There 
is a 1% contingent deferred sales charge that applies to investments of $250,000 or more (see "Investments 
of $250,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without 
an initial sales charge on shares sold within 18 months of purchase.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_24_"
          xlink:to="fn1_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_25_"
          xlink:to="fn1_"
          xlink:type="arc"/>
        <link:loc xlink:href="#_53_" xlink:label="_53_" xlink:type="locator"/>
        <link:loc xlink:href="#_50_" xlink:label="_50_" xlink:type="locator"/>
        <link:loc xlink:href="#_52_" xlink:label="_52_" xlink:type="locator"/>
        <link:loc xlink:href="#_54_" xlink:label="_54_" xlink:type="locator"/>
        <link:loc xlink:href="#_51_" xlink:label="_51_" xlink:type="locator"/>
        <link:footnote id="fn2_" xlink:label="fn2_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:span style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; font-weight:normal; text-decoration:none;"> The investment 
manager has agreed to waive fees and/or reimburse operating expenses (excluding Rule 12b-1 fees, acquired 
fund fees and expenses, interest expense and certain non-routine expenses or costs, such as those relating 
to litigation, indemnification, reorganizations and liquidations) for the Fund so that the ratio of total 
annual fund operating expenses will not exceed 0.46% for each share class except Class R6 and 0.40% for 
Class R6. The investment manager has also agreed to reduce its fees to reflect reduced services resulting 
from the Fund&#x2019;s investments in Franklin Templeton affiliated funds. In addition, transfer agency 
fees on Class R6 shares of the Fund have been capped so that transfer agency fees for that class do not 
exceed 0.02%. These contractual arrangements are expected to continue until June 30, 2027. During the 
terms, the fee waiver and expense reimbursement agreements may not be terminated or amended without approval 
of the board of trustees except to add series or classes, to reflect the extension of termination dates 
or to lower the waiver and expense limitation (which would result in lower fees for shareholders).</xhtml:span></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_53_"
          xlink:to="fn2_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_50_"
          xlink:to="fn2_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_52_"
          xlink:to="fn2_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_54_"
          xlink:to="fn2_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_51_"
          xlink:to="fn2_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_167_"
          xlink:label="_167_"
          xlink:type="locator"/>
        <link:footnote id="fn3_" xlink:label="fn3_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">Since inception August 1, 2017.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_167_"
          xlink:to="fn3_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_194_"
          xlink:label="_194_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_193_"
          xlink:label="_193_"
          xlink:type="locator"/>
        <link:footnote id="fn4_" xlink:label="fn4_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">There 
is a 1% contingent deferred sales charge that applies to investments of $250,000 or more (see "Investments 
of $250,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without 
an initial sales charge on shares sold within 18 months of purchase.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_194_"
          xlink:to="fn4_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_193_"
          xlink:to="fn4_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_216_"
          xlink:label="_216_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_215_"
          xlink:label="_215_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_214_"
          xlink:label="_214_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_217_"
          xlink:label="_217_"
          xlink:type="locator"/>
        <link:footnote id="fn5_" xlink:label="fn5_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:span style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; font-weight:normal; text-decoration:none;"> 
Total annual Fund operating expenses differ from the ratio of expenses to average net assets shown in 
the Financial Highlights, which reflect the operating expenses of the Fund and do not include acquired 
fund fees and expenses.</xhtml:span></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_216_"
          xlink:to="fn5_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_215_"
          xlink:to="fn5_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_214_"
          xlink:to="fn5_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_217_"
          xlink:to="fn5_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_221_"
          xlink:label="_221_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_220_"
          xlink:label="_220_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_219_"
          xlink:label="_219_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_218_"
          xlink:label="_218_"
          xlink:type="locator"/>
        <link:footnote id="fn6_" xlink:label="fn6_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:span style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; font-weight:normal; text-decoration:none;"> The investment manager has agreed to waive 
fees and/or reimburse operating expenses (excluding Rule 12b-1 fees, acquired fund fees and expenses, 
interest expense and certain non-routine expenses or costs, such as those relating to litigation, indemnification, 
reorganizations and liquidations) for the Fund so that the ratio of total annual fund operating expenses 
will not exceed 0.40% for each share class. The investment manager has also agreed to reduce its fees 
to reflect reduced services resulting from the Fund&#x2019;s investments in Franklin Templeton affiliated 
funds. In addition, transfer agency fees on Class R6 shares of the Fund have been capped so that transfer 
agency fees for that class do not exceed 0.03%. These contractual arrangements are expected to continue 
until June 30, 2027. During the terms, the fee waiver and expense reimbursement agreements may not be 
terminated or amended without approval of the board of trustees except to add series or classes, to reflect 
the extension of termination dates or to lower the waiver and expense limitation (which would result 
in lower fees for shareholders).</xhtml:span></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_221_"
          xlink:to="fn6_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_220_"
          xlink:to="fn6_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_219_"
          xlink:to="fn6_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_218_"
          xlink:to="fn6_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_321_"
          xlink:label="_321_"
          xlink:type="locator"/>
        <link:footnote id="fn7_" xlink:label="fn7_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">Since inception August 1, 2017.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_321_"
          xlink:to="fn7_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_349_"
          xlink:label="_349_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_348_"
          xlink:label="_348_"
          xlink:type="locator"/>
        <link:footnote id="fn8_" xlink:label="fn8_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">There 
is a 1% contingent deferred sales charge that applies to investments of $250,000 or more (see "Investments 
of $250,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without 
an initial sales charge on shares sold within 18 months of purchase.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_349_"
          xlink:to="fn8_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_348_"
          xlink:to="fn8_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_483_"
          xlink:label="_483_"
          xlink:type="locator"/>
        <link:footnote id="fn9_" xlink:label="fn9_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">Since inception August 1, 2017.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_483_"
          xlink:to="fn9_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_505_"
          xlink:label="_505_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_506_"
          xlink:label="_506_"
          xlink:type="locator"/>
        <link:footnote id="fn10_" xlink:label="fn10_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">There 
is a 1% contingent deferred sales charge that applies to investments of $250,000 or more (see "Investments 
of $250,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without 
an initial sales charge on shares sold within 18 months of purchase.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_505_"
          xlink:to="fn10_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_506_"
          xlink:to="fn10_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_534_"
          xlink:label="_534_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_531_"
          xlink:label="_531_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_533_"
          xlink:label="_533_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_535_"
          xlink:label="_535_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_532_"
          xlink:label="_532_"
          xlink:type="locator"/>
        <link:footnote id="fn11_" xlink:label="fn11_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:span style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; font-weight:normal; text-decoration:none;"> The investment 
manager has agreed to waive fees and/or reimburse operating expenses (excluding Rule 12b-1 fees, acquired 
fund fees and expenses, interest expense and certain non-routine expenses or costs, such as those relating 
to litigation, indemnification, reorganizations and liquidations) for the Fund so that the ratio of total 
annual fund operating expenses will not exceed 0.65% for each share class. In addition, transfer agency 
fees on Class R6 shares of the Fund have been capped so that transfer agency fees for that class do not 
exceed 0.03%. These contractual arrangements are expected to continue until June 30, 2027. During the 
terms, the fee waiver and expense reimbursement agreements may not be terminated or amended without approval 
of the board of trustees except to add series or classes, to reflect the extension of termination dates 
or to lower the waiver and expense limitation (which would result in lower fees for shareholders).</xhtml:span></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_534_"
          xlink:to="fn11_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_531_"
          xlink:to="fn11_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_533_"
          xlink:to="fn11_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_535_"
          xlink:to="fn11_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_532_"
          xlink:to="fn11_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_648_"
          xlink:label="_648_"
          xlink:type="locator"/>
        <link:footnote id="fn12_" xlink:label="fn12_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">Since inception August 1, 2017.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_648_"
          xlink:to="fn12_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_671_"
          xlink:label="_671_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_670_"
          xlink:label="_670_"
          xlink:type="locator"/>
        <link:footnote id="fn13_" xlink:label="fn13_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">There 
is a 1% contingent deferred sales charge that applies to investments of $250,000 or more (see "Investments 
of $250,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without 
an initial sales charge on shares sold within 18 months of purchase.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_671_"
          xlink:to="fn13_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_670_"
          xlink:to="fn13_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_803_"
          xlink:label="_803_"
          xlink:type="locator"/>
        <link:footnote id="fn14_" xlink:label="fn14_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">Since inception August 1, 2017.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_803_"
          xlink:to="fn14_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_828_"
          xlink:label="_828_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_827_"
          xlink:label="_827_"
          xlink:type="locator"/>
        <link:footnote id="fn15_" xlink:label="fn15_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">There 
is a 1% contingent deferred sales charge that applies to investments of $250,000 or more (see "Investments 
of $250,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without 
an initial sales charge on shares sold within 18 months of purchase.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_828_"
          xlink:to="fn15_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_827_"
          xlink:to="fn15_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_857_"
          xlink:label="_857_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_854_"
          xlink:label="_854_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_855_"
          xlink:label="_855_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_856_"
          xlink:label="_856_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_853_"
          xlink:label="_853_"
          xlink:type="locator"/>
        <link:footnote id="fn16_" xlink:label="fn16_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:span style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; font-weight:normal; text-decoration:none;"> The investment 
manager has agreed to waive fees and/or reimburse operating expenses (excluding Rule 12b-1 fees, acquired 
fund fees and expenses, interest expense and certain non-routine expenses or costs, such as those relating 
to litigation, indemnification, reorganizations and liquidations) for the Fund so that the ratio of total 
annual fund operating expenses will not exceed 0.65% for each share class. In addition, transfer agency 
fees on Class R6 shares of the Fund have been capped so that transfer agency fees for that class do not 
exceed 0.03%. These contractual arrangements are expected to continue until June 30, 2027. During the 
terms, the fee waiver and expense reimbursement agreements may not be terminated or amended without approval 
of the board of trustees except to add series or classes, to reflect the extension of termination dates 
or to lower the waiver and expense limitation (which would result in lower fees for shareholders).</xhtml:span></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_857_"
          xlink:to="fn16_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_854_"
          xlink:to="fn16_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_855_"
          xlink:to="fn16_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_856_"
          xlink:to="fn16_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_853_"
          xlink:to="fn16_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_970_"
          xlink:label="_970_"
          xlink:type="locator"/>
        <link:footnote id="fn17_" xlink:label="fn17_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">Since inception August 1, 2017.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_970_"
          xlink:to="fn17_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_992_"
          xlink:label="_992_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_993_"
          xlink:label="_993_"
          xlink:type="locator"/>
        <link:footnote id="fn18_" xlink:label="fn18_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">There 
is a 1% contingent deferred sales charge that applies to investments of $250,000 or more (see "Investments 
of $250,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without 
an initial sales charge on shares sold within 18 months of purchase.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_992_"
          xlink:to="fn18_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_993_"
          xlink:to="fn18_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_1020_"
          xlink:label="_1020_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_1019_"
          xlink:label="_1019_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_1022_"
          xlink:label="_1022_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_1021_"
          xlink:label="_1021_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_1018_"
          xlink:label="_1018_"
          xlink:type="locator"/>
        <link:footnote id="fn19_" xlink:label="fn19_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:span style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; font-weight:normal; text-decoration:none;"> The investment 
manager has agreed to waive fees and/or reimburse operating expenses (excluding Rule 12b-1 fees, acquired 
fund fees and expenses, interest expense and certain non-routine expenses or costs, such as those relating 
to litigation, indemnification, reorganizations and liquidations) for the Fund so that the ratio of total 
annual fund operating expenses will not exceed 0.65% for each share class. In addition, transfer agency 
fees on Class R6 shares of the Fund have been capped so that transfer agency fees for that class do not 
exceed 0.03%. These contractual arrangements are expected to continue until June 30, 2027. During the 
terms, the fee waiver and expense reimbursement agreements may not be terminated or amended without approval 
of the board of trustees except to add series or classes, to reflect the extension of termination dates 
or to lower the waiver and expense limitation (which would result in lower fees for shareholders).</xhtml:span></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1020_"
          xlink:to="fn19_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1019_"
          xlink:to="fn19_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1022_"
          xlink:to="fn19_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1021_"
          xlink:to="fn19_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1018_"
          xlink:to="fn19_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_1135_"
          xlink:label="_1135_"
          xlink:type="locator"/>
        <link:footnote id="fn20_" xlink:label="fn20_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">Since inception August 1, 2017.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1135_"
          xlink:to="fn20_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_1158_"
          xlink:label="_1158_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_1157_"
          xlink:label="_1157_"
          xlink:type="locator"/>
        <link:footnote id="fn21_" xlink:label="fn21_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">There 
is a 1% contingent deferred sales charge that applies to investments of $250,000 or more (see "Investments 
of $250,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without 
an initial sales charge on shares sold within 18 months of purchase.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1158_"
          xlink:to="fn21_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1157_"
          xlink:to="fn21_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_1186_"
          xlink:label="_1186_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_1185_"
          xlink:label="_1185_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_1187_"
          xlink:label="_1187_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_1183_"
          xlink:label="_1183_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_1184_"
          xlink:label="_1184_"
          xlink:type="locator"/>
        <link:footnote id="fn22_" xlink:label="fn22_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:span style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; font-weight:normal; text-decoration:none;"> The investment 
manager has agreed to waive fees and/or reimburse operating expenses (excluding Rule 12b-1 fees, acquired 
fund fees and expenses, interest expense and certain non-routine expenses or costs, such as those relating 
to litigation, indemnification, reorganizations and liquidations) for the Fund so that the ratio of total 
annual fund operating expenses will not exceed 0.65% for each share class. In addition, transfer agency 
fees on Class R6 shares of the Fund have been capped so that transfer agency fees for that class do not 
exceed 0.03%. These contractual arrangements are expected to continue until June 30, 2027. During the 
terms, the fee waiver and expense reimbursement agreements may not be terminated or amended without approval 
of the board of trustees except to add series or classes, to reflect the extension of termination dates 
or to lower the waiver and expense limitation (which would result in lower fees for shareholders).</xhtml:span></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1186_"
          xlink:to="fn22_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1185_"
          xlink:to="fn22_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1187_"
          xlink:to="fn22_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1183_"
          xlink:to="fn22_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1184_"
          xlink:to="fn22_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_1300_"
          xlink:label="_1300_"
          xlink:type="locator"/>
        <link:footnote id="fn23_" xlink:label="fn23_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">Since inception August 1, 2017.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1300_"
          xlink:to="fn23_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_1322_"
          xlink:label="_1322_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_1323_"
          xlink:label="_1323_"
          xlink:type="locator"/>
        <link:footnote id="fn24_" xlink:label="fn24_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">There 
is a 1% contingent deferred sales charge that applies to investments of $250,000 or more (see "Investments 
of $250,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without 
an initial sales charge on shares sold within 18 months of purchase.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1322_"
          xlink:to="fn24_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1323_"
          xlink:to="fn24_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_1348_"
          xlink:label="_1348_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_1350_"
          xlink:label="_1350_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_1351_"
          xlink:label="_1351_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_1352_"
          xlink:label="_1352_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_1349_"
          xlink:label="_1349_"
          xlink:type="locator"/>
        <link:footnote id="fn25_" xlink:label="fn25_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:span style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; font-weight:normal; text-decoration:none;"> The investment 
manager has agreed to waive fees and/or reimburse operating expenses (excluding Rule 12b-1 fees, acquired 
fund fees and expenses, interest expense and certain non-routine expenses or costs, such as those relating 
to litigation, indemnification, reorganizations and liquidations) for the Fund so that the ratio of total 
annual fund operating expenses will not exceed 0.65% for each share class. In addition, transfer agency 
fees on Class R6 shares of the Fund have been capped so that transfer agency fees for that class do not 
exceed 0.03%. These contractual arrangements are expected to continue until June 30, 2027. During the 
terms, the fee waiver and expense reimbursement agreements may not be terminated or amended without approval 
of the board of trustees except to add series or classes, to reflect the extension of termination dates 
or to lower the waiver and expense limitation (which would result in lower fees for shareholders).</xhtml:span></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1348_"
          xlink:to="fn25_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1350_"
          xlink:to="fn25_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1351_"
          xlink:to="fn25_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1352_"
          xlink:to="fn25_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1349_"
          xlink:to="fn25_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_1465_"
          xlink:label="_1465_"
          xlink:type="locator"/>
        <link:footnote id="fn26_" xlink:label="fn26_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">Since inception August 1, 2017.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1465_"
          xlink:to="fn26_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_1488_"
          xlink:label="_1488_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_1487_"
          xlink:label="_1487_"
          xlink:type="locator"/>
        <link:footnote id="fn27_" xlink:label="fn27_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">There 
is a 1% contingent deferred sales charge that applies to investments of $250,000 or more (see "Investments 
of $250,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without 
an initial sales charge on shares sold within 18 months of purchase.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1488_"
          xlink:to="fn27_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1487_"
          xlink:to="fn27_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_1620_"
          xlink:label="_1620_"
          xlink:type="locator"/>
        <link:footnote id="fn28_" xlink:label="fn28_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">Since inception August 1, 2017.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1620_"
          xlink:to="fn28_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_1643_"
          xlink:label="_1643_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_1642_"
          xlink:label="_1642_"
          xlink:type="locator"/>
        <link:footnote id="fn29_" xlink:label="fn29_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">There 
is a 1% contingent deferred sales charge that applies to investments of $250,000 or more (see "Investments 
of $250,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without 
an initial sales charge on shares sold within 18 months of purchase.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1643_"
          xlink:to="fn29_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1642_"
          xlink:to="fn29_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_1775_"
          xlink:label="_1775_"
          xlink:type="locator"/>
        <link:footnote id="fn30_" xlink:label="fn30_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">Since inception August 1, 2017.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1775_"
          xlink:to="fn30_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_1798_"
          xlink:label="_1798_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_1797_"
          xlink:label="_1797_"
          xlink:type="locator"/>
        <link:footnote id="fn31_" xlink:label="fn31_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">There 
is a 1% contingent deferred sales charge that applies to investments of $250,000 or more (see "Investments 
of $250,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without 
an initial sales charge on shares sold within 18 months of purchase.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1798_"
          xlink:to="fn31_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1797_"
          xlink:to="fn31_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_1930_"
          xlink:label="_1930_"
          xlink:type="locator"/>
        <link:footnote id="fn32_" xlink:label="fn32_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">Since inception August 1, 2017.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1930_"
          xlink:to="fn32_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_1954_"
          xlink:label="_1954_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_1955_"
          xlink:label="_1955_"
          xlink:type="locator"/>
        <link:footnote id="fn33_" xlink:label="fn33_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">There 
is a 1% contingent deferred sales charge that applies to investments of $250,000 or more (see "Investments 
of $250,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without 
an initial sales charge on shares sold within 18 months of purchase.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1954_"
          xlink:to="fn33_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_1955_"
          xlink:to="fn33_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_2087_"
          xlink:label="_2087_"
          xlink:type="locator"/>
        <link:footnote id="fn34_" xlink:label="fn34_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">Since inception August 1, 2017.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2087_"
          xlink:to="fn34_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_2110_"
          xlink:label="_2110_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_2109_"
          xlink:label="_2109_"
          xlink:type="locator"/>
        <link:footnote id="fn35_" xlink:label="fn35_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">There 
is a 1% contingent deferred sales charge that applies to investments of $250,000 or more (see "Investments 
of $250,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without 
an initial sales charge on shares sold within 18 months of purchase.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2110_"
          xlink:to="fn35_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2109_"
          xlink:to="fn35_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_2242_"
          xlink:label="_2242_"
          xlink:type="locator"/>
        <link:footnote id="fn36_" xlink:label="fn36_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">Since inception August 1, 2017.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2242_"
          xlink:to="fn36_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_2265_"
          xlink:label="_2265_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_2264_"
          xlink:label="_2264_"
          xlink:type="locator"/>
        <link:footnote id="fn37_" xlink:label="fn37_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">There 
is a 1% contingent deferred sales charge that applies to investments of $250,000 or more (see "Investments 
of $250,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without 
an initial sales charge on shares sold within 18 months of purchase.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2265_"
          xlink:to="fn37_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2264_"
          xlink:to="fn37_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_2294_"
          xlink:label="_2294_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_2292_"
          xlink:label="_2292_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_2290_"
          xlink:label="_2290_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_2293_"
          xlink:label="_2293_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_2291_"
          xlink:label="_2291_"
          xlink:type="locator"/>
        <link:footnote id="fn38_" xlink:label="fn38_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:span style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; font-weight:normal; text-decoration:none;"> The investment 
manager has agreed to waive fees and/or reimburse operating expenses (excluding Rule 12b-1 fees, acquired 
fund fees and expenses, interest expense and certain non-routine expenses or costs, such as those relating 
to litigation, indemnification, reorganizations and liquidations) for the Fund so that the ratio of total 
annual fund operating expenses will not exceed 0.65% for each share class. In addition, transfer agency 
fees on Class R6 shares of the Fund have been capped so that transfer agency fees for that class do not 
exceed 0.03%. These contractual arrangements are expected to continue until June 30, 2027. During the 
terms, the fee waiver and expense reimbursement agreements may not be terminated or amended without approval 
of the board of trustees except to add series or classes, to reflect the extension of termination dates 
or to lower the waiver and expense limitation (which would result in lower fees for shareholders).</xhtml:span></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2294_"
          xlink:to="fn38_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2292_"
          xlink:to="fn38_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2290_"
          xlink:to="fn38_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2293_"
          xlink:to="fn38_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2291_"
          xlink:to="fn38_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_2408_"
          xlink:label="_2408_"
          xlink:type="locator"/>
        <link:footnote id="fn39_" xlink:label="fn39_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">Since inception August 1, 2017.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2408_"
          xlink:to="fn39_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_2430_"
          xlink:label="_2430_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_2431_"
          xlink:label="_2431_"
          xlink:type="locator"/>
        <link:footnote id="fn40_" xlink:label="fn40_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">There 
is a 1% contingent deferred sales charge that applies to investments of $250,000 or more (see "Investments 
of $250,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without 
an initial sales charge on shares sold within 18 months of purchase.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2430_"
          xlink:to="fn40_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2431_"
          xlink:to="fn40_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_2563_"
          xlink:label="_2563_"
          xlink:type="locator"/>
        <link:footnote id="fn41_" xlink:label="fn41_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">Since inception August 1, 2017.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2563_"
          xlink:to="fn41_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_2586_"
          xlink:label="_2586_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_2585_"
          xlink:label="_2585_"
          xlink:type="locator"/>
        <link:footnote id="fn42_" xlink:label="fn42_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">There 
is a 1% contingent deferred sales charge that applies to investments of $250,000 or more (see "Investments 
of $250,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without 
an initial sales charge on shares sold within 18 months of purchase.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2586_"
          xlink:to="fn42_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2585_"
          xlink:to="fn42_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_2718_"
          xlink:label="_2718_"
          xlink:type="locator"/>
        <link:footnote id="fn43_" xlink:label="fn43_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">Since inception August 1, 2017.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2718_"
          xlink:to="fn43_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_2740_"
          xlink:label="_2740_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_2741_"
          xlink:label="_2741_"
          xlink:type="locator"/>
        <link:footnote id="fn44_" xlink:label="fn44_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">There 
is a 1% contingent deferred sales charge that applies to investments of $250,000 or more (see "Investments 
of $250,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without 
an initial sales charge on shares sold within 18 months of purchase.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2740_"
          xlink:to="fn44_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2741_"
          xlink:to="fn44_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_2873_"
          xlink:label="_2873_"
          xlink:type="locator"/>
        <link:footnote id="fn45_" xlink:label="fn45_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">Since inception August 1, 2017.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2873_"
          xlink:to="fn45_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_2895_"
          xlink:label="_2895_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_2896_"
          xlink:label="_2896_"
          xlink:type="locator"/>
        <link:footnote id="fn46_" xlink:label="fn46_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">There 
is a 1% contingent deferred sales charge that applies to investments of $250,000 or more (see "Investments 
of $250,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without 
an initial sales charge on shares sold within 18 months of purchase.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2895_"
          xlink:to="fn46_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_2896_"
          xlink:to="fn46_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_3028_"
          xlink:label="_3028_"
          xlink:type="locator"/>
        <link:footnote id="fn47_" xlink:label="fn47_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">Since inception August 1, 2017.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_3028_"
          xlink:to="fn47_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_3051_"
          xlink:label="_3051_"
          xlink:type="locator"/>
        <link:loc
          xlink:href="#_3050_"
          xlink:label="_3050_"
          xlink:type="locator"/>
        <link:footnote id="fn48_" xlink:label="fn48_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">There 
is a 1% contingent deferred sales charge that applies to investments of $250,000 or more (see "Investments 
of $250,000 or More" under "Choosing a Share Class") and purchases by certain retirement plans without 
an initial sales charge on shares sold within 18 months of purchase.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_3051_"
          xlink:to="fn48_"
          xlink:type="arc"/>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_3050_"
          xlink:to="fn48_"
          xlink:type="arc"/>
        <link:loc
          xlink:href="#_3183_"
          xlink:label="_3183_"
          xlink:type="locator"/>
        <link:footnote id="fn49_" xlink:label="fn49_" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:p style="font-size:7.0pt; font-family:Sans-Serif; font-style:normal; text-align:left; font-weight:normal; text-decoration:none;">Since inception August 1, 2017.</xhtml:p></link:footnote>
        <link:footnoteArc
          xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote"
          xlink:from="_3183_"
          xlink:to="fn49_"
          xlink:type="arc"/>
    </link:footnoteLink>
</xbrl>
