v3.25.3
Shareholder Report, Holdings (Details)
Aug. 31, 2025
C000005546 | Montgomery County, Trinity Health Credit Group  
Holdings [Line Items]  
Percent of Net Asset Value 9.30%
C000005546 | Maryland Economic Dev., Howard Hughes Medical Institute  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
C000005546 | Maryland HHEFA, Johns Hopkins Univ.  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000005546 | Maryland HHEFA, Johns Hopkins Health System  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000005546 | Howard County Housing Commission, Beech's Farm Apartments  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000005546 | Montgomery County  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000005546 | Maryland CDA, Multi-Family, Kirkwood Housing  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000005546 | Maryland DOT  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000005546 | Maryland HHEFA, Univ. of Maryland Medical System  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000005546 | Maryland CDA, Residential  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000005546 | Variable Rate Demand Notes  
Holdings [Line Items]  
Percent of Net Asset Value 60.00%
C000005546 | Other Municipal Security  
Holdings [Line Items]  
Percent of Net Asset Value 38.50%
C000005546 | Non-Financial Company Commercial Paper  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000005546 | Short-Term and Other  
Holdings [Line Items]  
Percent of Net Asset Value (0.90%)
C000193184 | Montgomery County, Trinity Health Credit Group  
Holdings [Line Items]  
Percent of Net Asset Value 9.30%
C000193184 | Maryland Economic Dev., Howard Hughes Medical Institute  
Holdings [Line Items]  
Percent of Net Asset Value 7.30%
C000193184 | Maryland HHEFA, Johns Hopkins Univ.  
Holdings [Line Items]  
Percent of Net Asset Value 4.80%
C000193184 | Maryland HHEFA, Johns Hopkins Health System  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000193184 | Howard County Housing Commission, Beech's Farm Apartments  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000193184 | Montgomery County  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000193184 | Maryland CDA, Multi-Family, Kirkwood Housing  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000193184 | Maryland DOT  
Holdings [Line Items]  
Percent of Net Asset Value 4.60%
C000193184 | Maryland HHEFA, Univ. of Maryland Medical System  
Holdings [Line Items]  
Percent of Net Asset Value 4.50%
C000193184 | Maryland CDA, Residential  
Holdings [Line Items]  
Percent of Net Asset Value 3.80%
C000193184 | Variable Rate Demand Notes  
Holdings [Line Items]  
Percent of Net Asset Value 60.00%
C000193184 | Other Municipal Security  
Holdings [Line Items]  
Percent of Net Asset Value 38.50%
C000193184 | Non-Financial Company Commercial Paper  
Holdings [Line Items]  
Percent of Net Asset Value 2.40%
C000193184 | Short-Term and Other  
Holdings [Line Items]  
Percent of Net Asset Value (0.90%)