Shareholder Report, Holdings (Details)	Aug. 31, 2026
C000005540 \| Maryland
Holdings [Line Items]
Percent of Net Asset Value	91.50%
C000005540 \| Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	5.50%
C000005540 \| District of Columbia
Holdings [Line Items]
Percent of Net Asset Value	3.50%
C000005540 \| Investment TypeOther Holdings Grouping
Holdings [Line Items]
Percent of Net Asset Value	(0.50%)
C000005540 \| Housing Finance Revenue
Holdings [Line Items]
Percent of Net Asset Value	27.10%
C000005540 \| Hospital Revenue
Holdings [Line Items]
Percent of Net Asset Value	25.60%
C000005540 \| General Obligations - Local
Holdings [Line Items]
Percent of Net Asset Value	10.70%
C000005540 \| Ground Transportation Revenue
Holdings [Line Items]
Percent of Net Asset Value	9.70%
C000005540 \| Dedicated Tax Revenue
Holdings [Line Items]
Percent of Net Asset Value	8.00%
C000005540 \| Lease Revenue
Holdings [Line Items]
Percent of Net Asset Value	6.70%
C000005540 \| Educational Revenue
Holdings [Line Items]
Percent of Net Asset Value	5.70%
C000005540 \| General Obligations - State
Holdings [Line Items]
Percent of Net Asset Value	1.70%
C000005540 \| Water & Sewer Revenue
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000005540 \| Other 2
Holdings [Line Items]
Percent of Net Asset Value	3.30%
C000193179 \| Maryland
Holdings [Line Items]
Percent of Net Asset Value	91.50%
C000193179 \| Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	5.50%
C000193179 \| District of Columbia
Holdings [Line Items]
Percent of Net Asset Value	3.50%
C000193179 \| Investment TypeOther Holdings Grouping
Holdings [Line Items]
Percent of Net Asset Value	(0.50%)
C000193179 \| Housing Finance Revenue
Holdings [Line Items]
Percent of Net Asset Value	27.10%
C000193179 \| Hospital Revenue
Holdings [Line Items]
Percent of Net Asset Value	25.60%
C000193179 \| General Obligations - Local
Holdings [Line Items]
Percent of Net Asset Value	10.70%
C000193179 \| Ground Transportation Revenue
Holdings [Line Items]
Percent of Net Asset Value	9.70%
C000193179 \| Dedicated Tax Revenue
Holdings [Line Items]
Percent of Net Asset Value	8.00%
C000193179 \| Lease Revenue
Holdings [Line Items]
Percent of Net Asset Value	6.70%
C000193179 \| Educational Revenue
Holdings [Line Items]
Percent of Net Asset Value	5.70%
C000193179 \| General Obligations - State
Holdings [Line Items]
Percent of Net Asset Value	1.70%
C000193179 \| Water & Sewer Revenue
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000193179 \| Other 2
Holdings [Line Items]
Percent of Net Asset Value	3.30%