Shareholder Report, Line Graph (Details) 74200006400_Franklin Michigan Tax-Free Income Fund_Class C_TSR Annual {Class C} - 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 C | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Class C (with sales charge) | ||||||||||
| Accumulated Value | $ 11,042 | $ 10,775 | $ 10,277 | $ 11,153 | $ 11,349 | $ 11,310 | $ 10,401 | $ 10,102 | $ 10,066 | $ 10,000 | $ 11,410 |
| 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 |