Shareholder Report, Average Annual Return (Details)
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12 Months Ended |
60 Months Ended |
120 Months Ended |
Feb. 28, 2026 |
Feb. 28, 2026 |
Feb. 28, 2026 |
Feb. 28, 2026 |
Feb. 28, 2026 |
| C000001519 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class I Shares at NAV
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| Average Annual Return, Percent |
3.93%
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0.87%
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2.22%
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| C000001516 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class A Shares at maximum sales charge (Offering Price)
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| Average Annual Return, Percent |
(0.68%)
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(0.19%)
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1.58%
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| C000001524 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class A Shares at maximum sales charge (Offering Price)
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| Average Annual Return, Percent |
(0.37%)
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(0.08%)
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1.34%
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| C000001527 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class I Shares at NAV
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| Average Annual Return, Percent |
4.26%
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1.00%
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2.00%
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| C000001531 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class I Shares at NAV
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| Average Annual Return, Percent |
3.35%
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0.52%
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1.89%
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| C000001528 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class A Shares at maximum sales charge (Offering Price)
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| Average Annual Return, Percent |
(1.22%)
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(0.55%)
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1.24%
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| C000001536 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class A Shares at maximum sales charge (Offering Price)
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| Average Annual Return, Percent |
(0.14%)
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0.22%
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1.89%
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| C000001539 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class I Shares at NAV
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| Average Annual Return, Percent |
4.33%
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1.28%
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2.53%
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| C000001543 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class I Shares at NAV
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| Average Annual Return, Percent |
3.77%
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0.95%
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2.16%
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| C000001540 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class A Shares at maximum sales charge (Offering Price)
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| Average Annual Return, Percent |
(0.78%)
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(0.11%)
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1.52%
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| C000023361 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class A Shares at maximum sales charge (Offering Price)
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| Average Annual Return, Percent |
(0.70%)
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(1.49%)
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1.64%
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| C000023364 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class I Shares at NAV
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| Average Annual Return, Percent |
3.86%
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(0.44%)
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2.29%
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| Without Sales Load [Member] | C000137687 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class C Shares at NAV (excluding maximum sales charge)
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| Average Annual Return, Percent |
2.91%
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(0.14%)
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1.37%
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| Without Sales Load [Member] | C000001516 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class A Shares at NAV (excluding maximum sales charge)
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| Average Annual Return, Percent |
3.64%
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0.67%
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2.02%
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| Without Sales Load [Member] | C000001524 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class A Shares at NAV (excluding maximum sales charge)
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| Average Annual Return, Percent |
3.96%
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0.78%
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1.78%
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| Without Sales Load [Member] | C000137688 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class C Shares at NAV (excluding maximum sales charge)
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| Average Annual Return, Percent |
3.22%
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0.00%
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1.13%
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| Without Sales Load [Member] | C000137689 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class C Shares at NAV (excluding maximum sales charge)
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| Average Annual Return, Percent |
2.39%
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(0.46%)
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1.03%
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| Without Sales Load [Member] | C000001528 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class A Shares at NAV (excluding maximum sales charge)
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| Average Annual Return, Percent |
3.14%
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0.31%
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1.68%
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| Without Sales Load [Member] | C000001536 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class A Shares at NAV (excluding maximum sales charge)
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| Average Annual Return, Percent |
4.20%
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1.08%
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2.33%
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| Without Sales Load [Member] | C000137690 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class C Shares at NAV (excluding maximum sales charge)
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| Average Annual Return, Percent |
3.28%
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0.25%
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1.68%
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| Without Sales Load [Member] | C000137691 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class C Shares at NAV (excluding maximum sales charge)
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| Average Annual Return, Percent |
2.74%
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(0.06%)
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1.30%
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| Without Sales Load [Member] | C000001540 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class A Shares at NAV (excluding maximum sales charge)
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| Average Annual Return, Percent |
3.57%
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0.75%
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1.95%
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| Without Sales Load [Member] | C000023361 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class A Shares at NAV (excluding maximum sales charge)
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| Average Annual Return, Percent |
3.62%
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(0.63%)
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2.08%
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| Without Sales Load [Member] | C000137692 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class C Shares at NAV (excluding maximum sales charge)
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| Average Annual Return, Percent |
2.82%
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(1.42%)
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1.43%
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| S And P Municipal Bond Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P Municipal Bond Index
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| Average Annual Return, Percent |
4.85%
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1.62%
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2.51%
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| S And P Municipal Bond California Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P Municipal Bond California Index
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| Average Annual Return, Percent |
4.67%
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1.45%
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2.40%
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| Lipper California Municipal Debt Funds Classification Average [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Lipper California Municipal Debt Funds Classification Average
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| Average Annual Return, Percent |
3.84%
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1.03%
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2.13%
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| Lipper Other States Municipal Debt Funds Classification Average [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Lipper Other States Municipal Debt Funds Classification Average
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| Average Annual Return, Percent |
4.26%
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0.87%
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1.69%
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| S And P Municipal Bond Connecticut Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P Municipal Bond Connecticut Index
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| Average Annual Return, Percent |
5.26%
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1.87%
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2.48%
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| Lipper Massachusetts Municipal Debt Funds Classification Average [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Lipper Massachusetts Municipal Debt Funds Classification Average
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| Average Annual Return, Percent |
3.73%
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0.58%
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1.51%
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| S And P Municipal Bond Massachusetts Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P Municipal Bond Massachusetts Index
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| Average Annual Return, Percent |
5.03%
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1.37%
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2.20%
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| S And P Municipal Bond New Jersey Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P Municipal Bond New Jersey Index
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| Average Annual Return, Percent |
5.19%
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2.01%
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3.19%
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| Lipper New Jersey Municipal Debt Funds Classification Average [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Lipper New Jersey Municipal Debt Funds Classification Average
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| Average Annual Return, Percent |
4.30%
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1.26%
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2.35%
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| Lipper New York Municipal Debt Funds Classification Average [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Lipper New York Municipal Debt Funds Classification Average
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| Average Annual Return, Percent |
3.56%
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1.02%
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2.07%
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| S And P Municipal Bond New York Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P Municipal Bond New York Index
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| Average Annual Return, Percent |
4.57%
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1.55%
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2.32%
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| S And P Municipal Yield Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P Municipal Yield Index
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| Average Annual Return, Percent |
3.73%
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2.24%
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4.13%
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