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Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Entity Information      
Off-Balance Sheet, Credit Loss, Liability $ 5.2 $ 18.4 $ 16.2
Off-Balance Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) (80.9) (31.1) $ (68.4)
Cumulative Effect, Period of Adoption, Adjusted Balance      
Entity Information      
Off-Balance Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) (13.2) 2.2  
Standby Letters of Credit      
Entity Information      
Credit extension commitments 73.5 97.1  
Commitments to Extend Credit      
Entity Information      
Credit extension commitments $ 3,076.5 $ 4,069.2