<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2025"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:sfb="http://imetrix.edgar-online.com/20260609"
  xmlns:us-gaap="http://fasb.org/us-gaap/2025"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="sfb-20260609.xsd" xlink:type="simple"/>
    <context id="duration_2026-06-09_to_2026-06-09">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000720672</identifier>
        </entity>
        <period>
            <startDate>2026-06-09</startDate>
            <endDate>2026-06-09</endDate>
        </period>
    </context>
    <context id="duration_2026-06-09_to_2026-06-09_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000720672</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:CommonStockMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-06-09</startDate>
            <endDate>2026-06-09</endDate>
        </period>
    </context>
    <context id="duration_2026-06-09_to_2026-06-09_us-gaap-StatementClassOfStockAxis_us-gaap-SeriesBPreferredStockMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000720672</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:SeriesBPreferredStockMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-06-09</startDate>
            <endDate>2026-06-09</endDate>
        </period>
    </context>
    <context id="duration_2026-06-09_to_2026-06-09_us-gaap-StatementClassOfStockAxis_us-gaap-SeriesCPreferredStockMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000720672</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:SeriesCPreferredStockMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-06-09</startDate>
            <endDate>2026-06-09</endDate>
        </period>
    </context>
    <context id="duration_2026-06-09_to_2026-06-09_us-gaap-StatementClassOfStockAxis_us-gaap-SeriesDPreferredStockMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000720672</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:SeriesDPreferredStockMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-06-09</startDate>
            <endDate>2026-06-09</endDate>
        </period>
    </context>
    <context id="duration_2026-06-09_to_2026-06-09_us-gaap-StatementClassOfStockAxis_sfb-M5.20SeniorNotesDue2047Member">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000720672</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">sfb:M5.20SeniorNotesDue2047Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-06-09</startDate>
            <endDate>2026-06-09</endDate>
        </period>
    </context>
    <dei:EntityRegistrantName
      contextRef="duration_2026-06-09_to_2026-06-09"
      id="Hidden_dei_EntityRegistrantName">STIFEL FINANCIAL CORP</dei:EntityRegistrantName>
    <dei:AmendmentFlag contextRef="duration_2026-06-09_to_2026-06-09" id="ixv-909">false</dei:AmendmentFlag>
    <dei:EntityCentralIndexKey
      contextRef="duration_2026-06-09_to_2026-06-09"
      id="Hidden_dei_EntityCentralIndexKey">0000720672</dei:EntityCentralIndexKey>
    <dei:CurrentFiscalYearEndDate
      contextRef="duration_2026-06-09_to_2026-06-09"
      id="Hidden_dei_CurrentFiscalYearEndDate_duration_2026-06-09_to_2026-06-09">--12-31</dei:CurrentFiscalYearEndDate>
    <dei:DocumentType contextRef="duration_2026-06-09_to_2026-06-09" id="ixv-961">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate contextRef="duration_2026-06-09_to_2026-06-09" id="ixv-962">2026-06-09</dei:DocumentPeriodEndDate>
    <dei:EntityIncorporationStateCountryCode contextRef="duration_2026-06-09_to_2026-06-09" id="ixv-963">DE</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber contextRef="duration_2026-06-09_to_2026-06-09" id="ixv-964">001-09305</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber contextRef="duration_2026-06-09_to_2026-06-09" id="ixv-965">43-1273600</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1 contextRef="duration_2026-06-09_to_2026-06-09" id="ixv-966">501 N. Broadway</dei:EntityAddressAddressLine1>
    <dei:EntityAddressCityOrTown contextRef="duration_2026-06-09_to_2026-06-09" id="ixv-967">St. Louis</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince contextRef="duration_2026-06-09_to_2026-06-09" id="ixv-968">MO</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode contextRef="duration_2026-06-09_to_2026-06-09" id="ixv-969">63102-2188</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode contextRef="duration_2026-06-09_to_2026-06-09" id="ixv-970">(314)</dei:CityAreaCode>
    <dei:LocalPhoneNumber contextRef="duration_2026-06-09_to_2026-06-09" id="ixv-971">342-2000</dei:LocalPhoneNumber>
    <dei:Security12bTitle
      contextRef="duration_2026-06-09_to_2026-06-09_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember"
      id="ixv-972">Common Stock, $0.15 par value per share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-06-09_to_2026-06-09_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember"
      id="ixv-973">SF</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-06-09_to_2026-06-09_us-gaap-StatementClassOfStockAxis_us-gaap-CommonStockMember"
      id="ixv-974">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-06-09_to_2026-06-09_us-gaap-StatementClassOfStockAxis_us-gaap-SeriesBPreferredStockMember"
      id="ixv-129">Depository Shares, each representing 1/1,000th interest in a share of 6.25% Non-Cumulative Preferred Stock, Series B</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-06-09_to_2026-06-09_us-gaap-StatementClassOfStockAxis_us-gaap-SeriesBPreferredStockMember"
      id="ixv-975">SF-PB</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-06-09_to_2026-06-09_us-gaap-StatementClassOfStockAxis_us-gaap-SeriesBPreferredStockMember"
      id="ixv-976">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-06-09_to_2026-06-09_us-gaap-StatementClassOfStockAxis_us-gaap-SeriesCPreferredStockMember"
      id="ixv-147">Depository Shares, each representing 1/1,000th interest in a share of 6.125% Non-Cumulative Preferred Stock, Series C</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-06-09_to_2026-06-09_us-gaap-StatementClassOfStockAxis_us-gaap-SeriesCPreferredStockMember"
      id="ixv-977">SF-PC</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-06-09_to_2026-06-09_us-gaap-StatementClassOfStockAxis_us-gaap-SeriesCPreferredStockMember"
      id="ixv-978">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-06-09_to_2026-06-09_us-gaap-StatementClassOfStockAxis_us-gaap-SeriesDPreferredStockMember"
      id="ixv-165">Depository Shares, each representing 1/1,000th interest in a share of 4.50% Non-Cumulative Preferred Stock, Series D</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-06-09_to_2026-06-09_us-gaap-StatementClassOfStockAxis_us-gaap-SeriesDPreferredStockMember"
      id="ixv-979">SF-PD</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-06-09_to_2026-06-09_us-gaap-StatementClassOfStockAxis_us-gaap-SeriesDPreferredStockMember"
      id="ixv-980">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="duration_2026-06-09_to_2026-06-09_us-gaap-StatementClassOfStockAxis_sfb-M5.20SeniorNotesDue2047Member"
      id="ixv-981">5.20% Senior Notes due 2047</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="duration_2026-06-09_to_2026-06-09_us-gaap-StatementClassOfStockAxis_sfb-M5.20SeniorNotesDue2047Member"
      id="ixv-982">SFB</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="duration_2026-06-09_to_2026-06-09_us-gaap-StatementClassOfStockAxis_sfb-M5.20SeniorNotesDue2047Member"
      id="ixv-983">NYSE</dei:SecurityExchangeName>
    <dei:WrittenCommunications contextRef="duration_2026-06-09_to_2026-06-09" id="ixv-984">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial contextRef="duration_2026-06-09_to_2026-06-09" id="ixv-985">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer contextRef="duration_2026-06-09_to_2026-06-09" id="ixv-986">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer contextRef="duration_2026-06-09_to_2026-06-09" id="ixv-987">false</dei:PreCommencementIssuerTenderOffer>
    <dei:EntityEmergingGrowthCompany contextRef="duration_2026-06-09_to_2026-06-09" id="ixv-988">false</dei:EntityEmergingGrowthCompany>
</xbrl>
