Shareholder Report, Average Annual Return (Details) |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Apr. 30, 2026 |
Apr. 30, 2026 |
Apr. 30, 2026 |
|
| C000089187 [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class Y | ||
| Average Annual Return, Percent | 6.27% | 1.08% | 1.97% |
| Bloomberg Municipal Bond Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||
| Average Annual Return, Percent | 6.34% | 0.90% | 2.20% |
| Bloomberg Hawaii Municipal Bond Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg Hawaii Municipal Bond Index | ||
| Average Annual Return, Percent | 6.13% | 0.84% | 1.98% |