v3.26.3
Shareholder Report, Line Graph (Details) - USD ($)
 12 Months Ended 24 Months Ended 36 Months Ended 48 Months Ended 60 Months Ended 72 Months Ended 84 Months Ended 96 Months Ended 108 Months Ended 120 Months Ended
Aug. 31, 2016
Aug. 31, 2026
Aug. 31, 2017
Aug. 31, 2018
Aug. 31, 2019
Aug. 31, 2020
Aug. 31, 2021
Aug. 31, 2022
Aug. 31, 2023
Aug. 31, 2024
Aug. 31, 2025
Aug. 31, 2026
C000017636                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Intermediate-Term Municipal Fund, Class F Shares                    
Accumulated Value $ 100,000   $ 100,586 $ 100,482 $ 108,499 $ 111,168 $ 115,588 $ 105,987 $ 107,165 $ 113,670 $ 114,329 $ 118,213
C000147417                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Intermediate-Term Municipal Fund, Class Y Shares                    
Accumulated Value 100,000   100,921 100,995 109,414 112,385 117,144 107,693 109,164 116,076 117,042 121,320
C000017624                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Short Duration Municipal Fund, Class F Shares                    
Accumulated Value 100,000   100,471 100,996 103,168 104,911 105,714 103,253 105,184 109,646 113,071 115,571
C000147411                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Short Duration Municipal Fund, Class Y Shares                    
Accumulated Value 100,000   100,724 101,504 103,947 105,873 106,946 104,700 106,925 111,740 115,519 118,367
C000017631                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   California Municipal Bond Fund, Class F Shares                    
Accumulated Value 100,000   100,537 99,263 106,373 108,919 110,346 101,844 102,589 107,075 108,737 110,949
C000147416                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   California Municipal Bond Fund, Class Y Shares                    
Accumulated Value 100,000   100,688 99,561 106,853 109,475 111,071 102,655 103,679 108,267 110,150 112,558
C000017627                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Massachusetts Municipal Bond Fund, Class F Shares                    
Accumulated Value 100,000   100,226 98,214 106,098 109,061 110,079 101,516 102,451 106,734 108,138 110,239
C000147413                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Massachusetts Municipal Bond Fund, Class Y Shares                    
Accumulated Value 100,000   100,291 98,422 106,590 109,637 110,930 102,344 103,545 107,932 109,622 111,807
C000017630                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   New Jersey Municipal Bond Fund, Class F Shares                    
Accumulated Value 100,000   100,687 100,167 107,156 109,540 111,114 103,584 104,964 109,292 111,376 113,795
C000147415                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   New Jersey Municipal Bond Fund, Class Y Shares                    
Accumulated Value 100,000   100,834 100,464 107,634 110,194 111,945 104,515 105,959 110,607 112,882 115,388
C000017629                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   New York Municipal Bond Fund, Class F Shares                    
Accumulated Value 100,000   100,609 98,961 106,292 107,658 110,092 102,601 103,945 108,640 110,367 113,182
C000147414                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   New York Municipal Bond Fund, Class Y Shares                    
Accumulated Value 100,000   100,859 99,262 106,789 108,327 110,948 103,538 105,046 110,068 111,984 115,013
C000017626                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Pennsylvania Municipal Bond Fund, Class F Shares                    
Accumulated Value 100,000   100,930 99,504 107,870 111,303 113,004 104,347 105,057 109,637 112,073 114,330
C000147412                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Pennsylvania Municipal Bond Fund, Class Y Shares                    
Accumulated Value 100,000   101,080 99,707 108,355 111,970 113,842 105,279 106,045 110,922 113,559 116,016
C000047166                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Tax-Advantaged Income Fund, Class F Shares                    
Accumulated Value 100,000   102,374 105,237 113,556 116,957 127,401 114,649 114,573 126,908 125,167 131,017
C000147418                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Tax-Advantaged Income Fund, Class Y Shares                    
Accumulated Value 100,000   102,626 105,757 114,401 118,119 128,989 116,350 116,555 129,431 127,962 134,274
Bloomberg US Municipal Bond Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg US Municipal Bond Index (USD)                    
Accumulated Value 100,000   100,883 101,376 110,215 113,781 117,645 107,490 109,322 115,978 116,067 120,849
Bloomberg US Municipal Bond Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg US Municipal Bond Index (USD)                    
Accumulated Value 100,000   100,883 101,376 110,215 113,781 117,645 107,490 109,322 115,978 116,067 120,849
Bloomberg US Municipal Bond Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg US Municipal Bond Index (USD)                    
Accumulated Value 100,000   100,883 101,376 110,215 113,781 117,645 107,490 109,322 115,978 116,067 120,849
Bloomberg US Municipal Bond Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg US Municipal Bond Index (USD)                    
Accumulated Value 100,000   100,883 101,376 110,215 113,781 117,645 107,490 109,322 115,978 116,067 120,849
Bloomberg US Municipal Bond Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg US Municipal Bond Index (USD)                    
Accumulated Value 100,000   100,883 101,376 110,215 113,781 117,645 107,490 109,322 115,978 116,067 120,849
Bloomberg US Municipal Bond Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg US Municipal Bond Index (USD)                    
Accumulated Value 100,000   100,883 101,376 110,215 113,781 117,645 107,490 109,322 115,978 116,067 120,849
Bloomberg US Municipal Bond Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg US Municipal Bond Index (USD)                    
Accumulated Value 100,000   100,883 101,376 110,215 113,781 117,645 107,490 109,322 115,978 116,067 120,849
Bloomberg US Municipal Bond Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg US Municipal Bond Index (USD)                    
Accumulated Value 100,000   100,883 101,376 110,215 113,781 117,645 107,490 109,322 115,978 116,067 120,849
Bloomberg US Municipal Bond Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg US Municipal Bond Index (USD)                    
Accumulated Value 100,000   100,883 101,376 110,215 113,781 117,645 107,490 109,322 115,978 116,067 120,849
Bloomberg US Municipal Bond Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg US Municipal Bond Index (USD)                    
Accumulated Value 100,000   100,883 101,376 110,215 113,781 117,645 107,490 109,322 115,978 116,067 120,849
Bloomberg US Municipal Bond Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg US Municipal Bond Index (USD)                    
Accumulated Value 100,000   100,883 101,376 110,215 113,781 117,645 107,490 109,322 115,978 116,067 120,849
Bloomberg US Municipal Bond Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg US Municipal Bond Index (USD)                    
Accumulated Value 100,000   100,883 101,376 110,215 113,781 117,645 107,490 109,322 115,978 116,067 120,849
Bloomberg US Municipal Bond Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg US Municipal Bond Index (USD)                    
Accumulated Value 100,000   100,883 101,376 110,215 113,781 117,645 107,490 109,322 115,978 116,067 120,849
Bloomberg US Municipal Bond Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg US Municipal Bond Index (USD)                    
Accumulated Value 100,000   100,883 101,376 110,215 113,781 117,645 107,490 109,322 115,978 116,067 120,849
Bloomberg US Municipal Bond Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg US Municipal Bond Index (USD)                    
Accumulated Value 100,000   100,883 101,376 110,215 113,781 117,645 107,490 109,322 115,978 116,067 120,849
Bloomberg US Municipal Bond Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg US Municipal Bond Index (USD)                    
Accumulated Value 100,000   100,883 101,376 110,215 113,781 117,645 107,490 109,322 115,978 116,067 120,849
Bloomberg 3-15 Year Municipal Blend Index (2-17) (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg 3-15 Year Municipal Blend Index (2-17) (USD)                    
Accumulated Value 100,000   101,094 101,136 109,387 113,098 116,205 107,966 109,779 115,550 117,662 121,105
Bloomberg 3-15 Year Municipal Blend Index (2-17) (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg 3-15 Year Municipal Blend Index (2-17) (USD)                    
Accumulated Value 100,000   101,094 101,136 109,387 113,098 116,205 107,966 109,779 115,550 117,662 121,105
Bloomberg 1 Year Municipal Bond Index (1-2) (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg 1 Year Municipal Bond Index (1-2) (USD)                    
Accumulated Value 100,000   101,040 101,689 104,388 106,425 107,089 105,383 107,312 111,829 115,474 118,197
Bloomberg 1 Year Municipal Bond Index (1-2) (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg 1 Year Municipal Bond Index (1-2) (USD)                    
Accumulated Value 100,000   101,040 101,689 104,388 106,425 107,089 105,383 107,312 111,829 115,474 118,197
Bloomberg California Intermediate Municipal Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg California Intermediate Municipal Index (USD)                    
Accumulated Value 100,000   100,989 100,760 108,412 112,430 114,080 106,419 107,834 112,936 116,270 118,321
Bloomberg California Intermediate Municipal Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg California Intermediate Municipal Index (USD)                    
Accumulated Value 100,000   100,989 100,760 108,412 112,430 114,080 106,419 107,834 112,936 116,270 118,321
Bloomberg Massachusetts Intermediate Municipal Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg Massachusetts Intermediate Municipal Index (USD)                    
Accumulated Value 100,000   101,191 99,956 108,371 112,896 114,608 106,723 108,125 112,816 115,433 117,729
Bloomberg Massachusetts Intermediate Municipal Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg Massachusetts Intermediate Municipal Index (USD)                    
Accumulated Value 100,000   101,191 99,956 108,371 112,896 114,608 106,723 108,125 112,816 115,433 117,729
Bloomberg 3-10 Year Municipal Blend Index (2-12) (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg 3-10 Year Municipal Blend Index (2-12) (USD)                    
Accumulated Value 100,000   101,263 100,909 108,214 111,879 114,290 107,341 108,839 114,071 117,248 119,968
Bloomberg 3-10 Year Municipal Blend Index (2-12) (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg 3-10 Year Municipal Blend Index (2-12) (USD)                    
Accumulated Value 100,000   101,263 100,909 108,214 111,879 114,290 107,341 108,839 114,071 117,248 119,968
Bloomberg New York Intermediate Municipal Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg New York Intermediate Municipal Index (USD)                    
Accumulated Value 100,000   101,391 100,369 108,422 110,611 114,047 106,901 108,720 113,765 116,655 119,400
Bloomberg New York Intermediate Municipal Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg New York Intermediate Municipal Index (USD)                    
Accumulated Value 100,000   101,391 100,369 108,422 110,611 114,047 106,901 108,720 113,765 116,655 119,400
Bloomberg Pennsylvania Intermediate Municipal Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg Pennsylvania Intermediate Municipal Index (USD)                    
Accumulated Value 100,000   102,004 101,578 111,473 115,768 119,313 110,819 112,231 117,276 120,848 123,715
Bloomberg Pennsylvania Intermediate Municipal Index (USD)                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg Pennsylvania Intermediate Municipal Index (USD)                    
Accumulated Value 100,000   102,004 101,578 111,473 115,768 119,313 110,819 112,231 117,276 120,848 123,715
Bloomberg 60% Tax-Exempt High Yield/40% Municipal Investment Grade Custom Capped Custom Weighted Index Unhedged US                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg 60% Tax-Exempt High Yield/40% Municipal Investment Grade Custom Capped Custom Weighted Index Unhedged US                    
Accumulated Value 100,000   101,713 105,668 115,573 117,844 127,963 115,821 116,991 128,489 127,377 134,560
Bloomberg 60% Tax-Exempt High Yield/40% Municipal Investment Grade Custom Capped Custom Weighted Index Unhedged US                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Bloomberg 60% Tax-Exempt High Yield/40% Municipal Investment Grade Custom Capped Custom Weighted Index Unhedged US                    
Accumulated Value $ 100,000   $ 101,713 $ 105,668 $ 115,573 $ 117,844 $ 127,963 $ 115,821 $ 116,991 $ 128,489 $ 127,377 $ 134,560