Shareholder Report, Holdings (Details)	Aug. 31, 2025
C000005543 \| Maryland
Holdings [Line Items]
Percent of Net Asset Value	92.90%
C000005543 \| Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	4.80%
C000005543 \| Georgia
Holdings [Line Items]
Percent of Net Asset Value	0.60%
C000005543 \| Alabama
Holdings [Line Items]
Percent of Net Asset Value	0.60%
C000005543 \| Other Holdings Grouping
Holdings [Line Items]
Percent of Net Asset Value	1.10%
C000005543 \| General Obligations - Local
Holdings [Line Items]
Percent of Net Asset Value	21.20%
C000005543 \| Dedicated Tax Revenue
Holdings [Line Items]
Percent of Net Asset Value	16.10%
C000005543 \| General Obligations - State
Holdings [Line Items]
Percent of Net Asset Value	14.70%
C000005543 \| Housing Finance Revenue
Holdings [Line Items]
Percent of Net Asset Value	12.60%
C000005543 \| Hospital Revenue
Holdings [Line Items]
Percent of Net Asset Value	11.40%
C000005543 \| Air & Sea Transportation
Holdings [Line Items]
Percent of Net Asset Value	8.90%
C000005543 \| Pre-Refunded
Holdings [Line Items]
Percent of Net Asset Value	4.60%
C000005543 \| Educational Revenue
Holdings [Line Items]
Percent of Net Asset Value	2.80%
C000005543 \| Water & Sewer Revenue
Holdings [Line Items]
Percent of Net Asset Value	2.40%
C000005543 \| Other 2
Holdings [Line Items]
Percent of Net Asset Value	5.30%
C000193182 \| Maryland
Holdings [Line Items]
Percent of Net Asset Value	92.90%
C000193182 \| Puerto Rico
Holdings [Line Items]
Percent of Net Asset Value	4.80%
C000193182 \| Georgia
Holdings [Line Items]
Percent of Net Asset Value	0.60%
C000193182 \| Alabama
Holdings [Line Items]
Percent of Net Asset Value	0.60%
C000193182 \| Other Holdings Grouping
Holdings [Line Items]
Percent of Net Asset Value	1.10%
C000193182 \| General Obligations - Local
Holdings [Line Items]
Percent of Net Asset Value	21.20%
C000193182 \| Dedicated Tax Revenue
Holdings [Line Items]
Percent of Net Asset Value	16.10%
C000193182 \| General Obligations - State
Holdings [Line Items]
Percent of Net Asset Value	14.70%
C000193182 \| Housing Finance Revenue
Holdings [Line Items]
Percent of Net Asset Value	12.60%
C000193182 \| Hospital Revenue
Holdings [Line Items]
Percent of Net Asset Value	11.40%
C000193182 \| Air & Sea Transportation
Holdings [Line Items]
Percent of Net Asset Value	8.90%
C000193182 \| Pre-Refunded
Holdings [Line Items]
Percent of Net Asset Value	4.60%
C000193182 \| Educational Revenue
Holdings [Line Items]
Percent of Net Asset Value	2.80%
C000193182 \| Water & Sewer Revenue
Holdings [Line Items]
Percent of Net Asset Value	2.40%
C000193182 \| Other 2
Holdings [Line Items]
Percent of Net Asset Value	5.30%