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 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Apr. 30, 2016 |
Apr. 30, 2026 |
Apr. 30, 2017 |
Apr. 30, 2018 |
Apr. 30, 2019 |
Apr. 30, 2020 |
Apr. 30, 2021 |
Apr. 30, 2022 |
Apr. 30, 2023 |
Apr. 30, 2024 |
Apr. 30, 2025 |
Apr. 30, 2026 |
|
| C000089187 [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class Y | |||||||||||
| Accumulated Value | $ 10,000 | $ 9,990 | $ 10,053 | $ 10,585 | $ 10,917 | $ 11,522 | $ 10,766 | $ 11,035 | $ 11,150 | $ 11,442 | $ 12,159 | |
| Bloomberg Municipal Bond Index [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | |||||||||||
| Accumulated Value | 10,000 | 10,014 | 10,170 | 10,797 | 11,030 | 11,884 | 10,947 | 11,262 | 11,497 | 11,688 | 12,429 | |
| Bloomberg Hawaii Municipal Bond Index [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Bloomberg Hawaii Municipal Bond Index | |||||||||||
| Accumulated Value | $ 10,000 | $ 10,002 | $ 10,096 | $ 10,673 | $ 10,997 | $ 11,671 | $ 10,837 | $ 11,174 | $ 11,253 | $ 11,465 | $ 12,167 | |