v3.25.1
Shareholder Report, Line Graph (Details) - USD ($)
 12 Months Ended 60 Months Ended 76 Months Ended 120 Months Ended
Mar. 31, 2025
Mar. 31, 2025
Mar. 31, 2025
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Nov. 30, 2018
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
C000024774 [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Class A (with maximum 3.00% sales charge)                            
Account Value $ 10,938 $ 10,938 $ 10,938 $ 10,938 $ 10,821 $ 10,719 $ 10,740 $ 11,218 $ 10,895 $ 10,628   $ 10,277 $ 10,236 $ 10,291 $ 10,000
Average Annual Return, Percent (2.00%) (0.73%)   0.49%                      
C000024774 [Member] | Without Sales Load [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Class A (without sales charge)                            
Average Annual Return, Percent 1.08% 0.08%   0.90%                      
C000024775 [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Class C (with maximum 1.00% contingent deferred sales charge)                            
Account Value $ 10,095 $ 10,095 10,095 $ 10,095 10,077 10,062 10,163 10,691 10,476 10,292   10,033 10,083 10,210 10,000
Average Annual Return, Percent (0.81%) (0.74%)   0.09%                      
C000024775 [Member] | Without Sales Load [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Class C (without contingent deferred sales charge)                            
Average Annual Return, Percent 0.18% (0.74%)   0.09%                      
C000188793 [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Class F                            
Account Value $ 10,728 $ 10,728 $ 10,728 $ 10,728 10,601 10,487 10,482 10,922 10,592 10,293 $ 10,000        
Average Annual Return, Percent 1.20% 0.25% 1.12% [1]                        
C000024777 [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Class Y                            
Account Value $ 11,159 $ 11,159 $ 11,159 $ 11,159 11,018 10,892 10,891 11,351 11,012 10,713   10,339 10,279 10,314 10,000
Average Annual Return, Percent 1.28% 0.27%   1.10%                      
Bloomberg Municipal Bond Index [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Bloomberg Municipal Bond Index                            
Account Value $ 12,341 $ 12,341 $ 12,341 $ 12,341 12,193 11,823 11,793 12,344 11,700 11,266 10,000 10,691 10,414 10,398 10,000
Average Annual Return, Percent 1.22% [2] 1.07% [2] 2.10% [3],[4] 2.13% [2]                      
Bloomberg Hawaii Municipal Bond Index [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Bloomberg Hawaii Municipal Bond Index                            
Account Value $ 12,059 $ 12,059 $ 12,059 $ 12,059 11,892 11,720 11,632 12,144 11,600 11,158 10,000 10,611 10,402 10,391 10,000
Average Annual Return, Percent 1.41% 0.78% 1.88% [3] 1.89%                      
Bloomberg Municipal Bond Quality Intermediate Total Return Index [Member]                              
Account Value [Line Items]                              
Line Graph and Table Measure Name Bloomberg Municipal Bond Quality Intermediate Total Return Index                            
Account Value $ 11,945 $ 11,945 $ 11,945 $ 11,945 $ 11,741 $ 11,506 $ 11,276 $ 11,791 $ 11,286 $ 10,948 $ 10,000 $ 10,444 $ 10,329 $ 10,316 $ 10,000
Average Annual Return, Percent 1.74% 1.14% 1.93% [3] 1.79%                      
[1] Class F Shares commenced operations on November 30, 2018.
[2] The Trust has designated the Bloomberg Municipal Bond Index as its new broad-based securities market index in accordance with the SEC’s revised definition for such an index.
[3] Benchmark performance is from the commencement date of the Fund Class only and is not the commencement date of the benchmark itself.
[4] The Trust has designated the Bloomberg Municipal Bond Index as its new broad-based securities market index in accordance with the SEC’s revised definition for such an index.