v3.26.1
Shareholder Report, Holdings (Details)
May 31, 2026
C000016740 | Texas  
Holdings [Line Items]  
Percent of Net Asset Value 19.00%
C000016740 | New York  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000016740 | Florida  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
C000016740 | Illinois  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
C000016740 | Wisconsin  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000016740 | NR  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000016740 | AAA  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000016740 | AA  
Holdings [Line Items]  
Percent of Net Asset Value 31.00%
C000016740 | A  
Holdings [Line Items]  
Percent of Net Asset Value 30.00%
C000016740 | BBB  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000016740 | BB  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000016740 | B  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000016740 | CCC  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000016740 | CC  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000016740 | Revenue Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 81.00%
C000016740 | General Obligation Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 14.00%
C000016740 | Lease Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000016740 | Variable Rate Demand Notes  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000016740 | Escrow to Maturity/Prerefunded Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000016740 | Other  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000016740 | Other Assets and Liabilities, Net  
Holdings [Line Items]  
Percent of Net Asset Value (4.00%)
C000016743 | Texas  
Holdings [Line Items]  
Percent of Net Asset Value 19.00%
C000016743 | New York  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000016743 | Florida  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
C000016743 | Illinois  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
C000016743 | Wisconsin  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000016743 | NR  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000016743 | AAA  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000016743 | AA  
Holdings [Line Items]  
Percent of Net Asset Value 31.00%
C000016743 | A  
Holdings [Line Items]  
Percent of Net Asset Value 30.00%
C000016743 | BBB  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000016743 | BB  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000016743 | B  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000016743 | CCC  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000016743 | CC  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000016743 | Revenue Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 81.00%
C000016743 | General Obligation Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 14.00%
C000016743 | Lease Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000016743 | Variable Rate Demand Notes  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000016743 | Escrow to Maturity/Prerefunded Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000016743 | Other  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000016743 | Other Assets and Liabilities, Net  
Holdings [Line Items]  
Percent of Net Asset Value (4.00%)
C000016744 | Texas  
Holdings [Line Items]  
Percent of Net Asset Value 19.00%
C000016744 | New York  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000016744 | Florida  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
C000016744 | Illinois  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
C000016744 | Wisconsin  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000016744 | NR  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000016744 | AAA  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000016744 | AA  
Holdings [Line Items]  
Percent of Net Asset Value 31.00%
C000016744 | A  
Holdings [Line Items]  
Percent of Net Asset Value 30.00%
C000016744 | BBB  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000016744 | BB  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000016744 | B  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000016744 | CCC  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000016744 | CC  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000016744 | Revenue Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 81.00%
C000016744 | General Obligation Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 14.00%
C000016744 | Lease Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000016744 | Variable Rate Demand Notes  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000016744 | Escrow to Maturity/Prerefunded Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000016744 | Other  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000016744 | Other Assets and Liabilities, Net  
Holdings [Line Items]  
Percent of Net Asset Value (4.00%)
C000016745 | Texas  
Holdings [Line Items]  
Percent of Net Asset Value 19.00%
C000016745 | New York  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000016745 | Florida  
Holdings [Line Items]  
Percent of Net Asset Value 8.00%
C000016745 | Illinois  
Holdings [Line Items]  
Percent of Net Asset Value 7.00%
C000016745 | Wisconsin  
Holdings [Line Items]  
Percent of Net Asset Value 5.00%
C000016745 | NR  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000016745 | AAA  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000016745 | AA  
Holdings [Line Items]  
Percent of Net Asset Value 31.00%
C000016745 | A  
Holdings [Line Items]  
Percent of Net Asset Value 30.00%
C000016745 | BBB  
Holdings [Line Items]  
Percent of Net Asset Value 12.00%
C000016745 | BB  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000016745 | B  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000016745 | CCC  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000016745 | CC  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000016745 | Revenue Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 81.00%
C000016745 | General Obligation Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 14.00%
C000016745 | Lease Obligations  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000016745 | Variable Rate Demand Notes  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000016745 | Escrow to Maturity/Prerefunded Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 2.00%
C000016745 | Other  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000016745 | Other Assets and Liabilities, Net  
Holdings [Line Items]  
Percent of Net Asset Value (4.00%)