Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Mar. 31, 2025 |
Dec. 31, 2024 |
Mar. 31, 2024 |
Dec. 31, 2023 |
|
| Entity Information [Line Items] | ||||||||
| Off-Balance Sheet, Credit Loss, Liability | $ 4.8 | $ 5.8 | $ 4.8 | $ 5.8 | $ 5.1 | $ 5.2 | $ 15.4 | $ 18.4 |
| Reduction of provision for credit loss expense | (0.1) | (18.6) | (20.3) | (27.0) | ||||
| Credit Extension Commitments | 2,896.2 | 2,896.2 | 3,076.5 | |||||
| Standby Letter of Credit | ||||||||
| Entity Information [Line Items] | ||||||||
| Credit Extension Commitments | 64.4 | 64.4 | $ 73.5 | |||||
| Cumulative effect, period of adoption, adjusted balance | ||||||||
| Entity Information [Line Items] | ||||||||
| Reduction of provision for credit loss expense | $ (0.3) | $ (9.6) | $ (0.4) | $ (12.6) | ||||