S000018524 [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 |
|
| LIMITED TERM TAX-EXEMPT FUND | LIMITED TERM TAX-EXEMPT FUND | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 4.05% | 2.19% | 3.23% | (3.20%) | (0.05%) | 3.52% | 3.93% | 1.46% | 1.23% | (0.31%) |