S000001258 [Member] Annual Total Returns |
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| INTERMEDIATE TAX-EXEMPT FUND | INTERMEDIATE TAX-EXEMPT FUND | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 4.83% | 1.79% | 5.01% | (8.29%) | 0.64% | 4.67% | 6.53% | 0.81% | 3.94% | (0.09%) |