Shareholder Report, Holdings (Details)	Feb. 28, 2026
C000016818 \| NR
Holdings [Line Items]
Percent of Net Asset Value	9.00%
C000016818 \| AAA
Holdings [Line Items]
Percent of Net Asset Value	13.00%
C000016818 \| AA
Holdings [Line Items]
Percent of Net Asset Value	42.00%
C000016818 \| A
Holdings [Line Items]
Percent of Net Asset Value	17.00%
C000016818 \| BBB
Holdings [Line Items]
Percent of Net Asset Value	13.00%
C000016818 \| BB
Holdings [Line Items]
Percent of Net Asset Value	4.00%
C000016818 \| B
Holdings [Line Items]
Percent of Net Asset Value	0.00%
C000016818 \| Revenue Bonds
Holdings [Line Items]
Percent of Net Asset Value	82.00%
C000016818 \| Lease Obligations
Holdings [Line Items]
Percent of Net Asset Value	12.00%
C000016818 \| General Obligation Bonds
Holdings [Line Items]
Percent of Net Asset Value	6.00%
C000016818 \| Other
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000016818 \| Variable Rate Demand Notes
Holdings [Line Items]
Percent of Net Asset Value	1.00%
C000016818 \| Other Assets and Liabilities, Net
Holdings [Line Items]
Percent of Net Asset Value	(3.00%)
C000016820 \| NR
Holdings [Line Items]
Percent of Net Asset Value	9.00%
C000016820 \| AAA
Holdings [Line Items]
Percent of Net Asset Value	13.00%
C000016820 \| AA
Holdings [Line Items]
Percent of Net Asset Value	42.00%
C000016820 \| A
Holdings [Line Items]
Percent of Net Asset Value	17.00%
C000016820 \| BBB
Holdings [Line Items]
Percent of Net Asset Value	13.00%
C000016820 \| BB
Holdings [Line Items]
Percent of Net Asset Value	4.00%
C000016820 \| B
Holdings [Line Items]
Percent of Net Asset Value	0.00%
C000016820 \| Revenue Bonds
Holdings [Line Items]
Percent of Net Asset Value	82.00%
C000016820 \| Lease Obligations
Holdings [Line Items]
Percent of Net Asset Value	12.00%
C000016820 \| General Obligation Bonds
Holdings [Line Items]
Percent of Net Asset Value	6.00%
C000016820 \| Other
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000016820 \| Variable Rate Demand Notes
Holdings [Line Items]
Percent of Net Asset Value	1.00%
C000016820 \| Other Assets and Liabilities, Net
Holdings [Line Items]
Percent of Net Asset Value	(3.00%)
C000223771 \| NR
Holdings [Line Items]
Percent of Net Asset Value	9.00%
C000223771 \| AAA
Holdings [Line Items]
Percent of Net Asset Value	13.00%
C000223771 \| AA
Holdings [Line Items]
Percent of Net Asset Value	42.00%
C000223771 \| A
Holdings [Line Items]
Percent of Net Asset Value	17.00%
C000223771 \| BBB
Holdings [Line Items]
Percent of Net Asset Value	13.00%
C000223771 \| BB
Holdings [Line Items]
Percent of Net Asset Value	4.00%
C000223771 \| B
Holdings [Line Items]
Percent of Net Asset Value	0.00%
C000223771 \| Revenue Bonds
Holdings [Line Items]
Percent of Net Asset Value	82.00%
C000223771 \| Lease Obligations
Holdings [Line Items]
Percent of Net Asset Value	12.00%
C000223771 \| General Obligation Bonds
Holdings [Line Items]
Percent of Net Asset Value	6.00%
C000223771 \| Other
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000223771 \| Variable Rate Demand Notes
Holdings [Line Items]
Percent of Net Asset Value	1.00%
C000223771 \| Other Assets and Liabilities, Net
Holdings [Line Items]
Percent of Net Asset Value	(3.00%)
C000016821 \| NR
Holdings [Line Items]
Percent of Net Asset Value	9.00%
C000016821 \| AAA
Holdings [Line Items]
Percent of Net Asset Value	13.00%
C000016821 \| AA
Holdings [Line Items]
Percent of Net Asset Value	42.00%
C000016821 \| A
Holdings [Line Items]
Percent of Net Asset Value	17.00%
C000016821 \| BBB
Holdings [Line Items]
Percent of Net Asset Value	13.00%
C000016821 \| BB
Holdings [Line Items]
Percent of Net Asset Value	4.00%
C000016821 \| B
Holdings [Line Items]
Percent of Net Asset Value	0.00%
C000016821 \| Revenue Bonds
Holdings [Line Items]
Percent of Net Asset Value	82.00%
C000016821 \| Lease Obligations
Holdings [Line Items]
Percent of Net Asset Value	12.00%
C000016821 \| General Obligation Bonds
Holdings [Line Items]
Percent of Net Asset Value	6.00%
C000016821 \| Other
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000016821 \| Variable Rate Demand Notes
Holdings [Line Items]
Percent of Net Asset Value	1.00%
C000016821 \| Other Assets and Liabilities, Net
Holdings [Line Items]
Percent of Net Asset Value	(3.00%)

Shareholder Report, Holdings (Details)

Feb. 28, 2026