Shareholder Report, Line Graph (Details) 74200007300_Franklin Oregon Tax-Free Income Fund_Class R6_TSR Annual {Class R6} - USD ($) |
12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Feb. 28, 2025 |
Feb. 29, 2024 |
Feb. 28, 2023 |
Feb. 28, 2022 |
Feb. 28, 2021 |
Feb. 29, 2020 |
Feb. 28, 2019 |
Feb. 28, 2018 |
Feb. 28, 2017 |
Feb. 29, 2016 |
Feb. 28, 2026 |
|
| Class R6 | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Class R6 | ||||||||||
| Accumulated Value | $ 11,591 | $ 11,217 | $ 10,674 | $ 11,478 | $ 11,492 | $ 11,478 | $ 10,560 | $ 10,228 | $ 10,091 | $ 10,000 | $ 12,098 |
| Bloomberg Municipal Bond Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||
| Accumulated Value | $ 12,112 | $ 11,764 | $ 11,159 | $ 11,759 | $ 11,837 | $ 11,713 | $ 10,700 | $ 10,276 | $ 10,025 | $ 10,000 | $ 12,713 |