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Commitments and Credit Risk - Lines of Credit (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Commitments and Credit Risk    
Letters of credit outstanding, amount $ 16.8 $ 16.5
Commercial lines of credit    
Commitments and Credit Risk    
Letters of credit outstanding, amount 993.8 1,000.0
Open-end consumer lines of credit    
Commitments and Credit Risk    
Letters of credit outstanding, amount $ 205.6 $ 204.0