Load [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 |
|
| Mississippi Tax-Free Income Series | Mississippi Tax-Free Income Series | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 3.84% | 0.41% | 4.31% | (7.95%) | 1.32% | 4.07% | 5.82% | 0.30% | 4.59% | 0.65% |