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Loans and Allowance for Loan Losses - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable Including Other Real Estated Owned [Line Items]      
Commercial, industrial, commercial real estate or construction loans, held for investment, period of time after payment becomes delinquent that the Company stops accruing interest income and applies subsequent interest payments as principal reductions 90 days    
Consumer loans including residential real estate, held for investment, period of time after payment becomes delinquent or when foreclosure proceedings have been initiated that the Company stops accruing interest income 90 days    
Impact to the allowance for loan losses related to modifications classified as TDRs $ 5.3 $ 3.7  
Commitments to lend additional funds to borrowers whose terms have been modified in a TDR 43.1   $ 43.8
Other real estate owned 21.0   22.0
Loans secured by residential real estate properties for which formal foreclosure proceedings were in process 52.0   57.0
Other assets      
Accounts, Notes, Loans and Financing Receivable Including Other Real Estated Owned [Line Items]      
Accrued interest receivable 206.0   205.0
Interest Rate Concession      
Accounts, Notes, Loans and Financing Receivable Including Other Real Estated Owned [Line Items]      
TDRs 5.2 4.7  
Modification of Loan Structure      
Accounts, Notes, Loans and Financing Receivable Including Other Real Estated Owned [Line Items]      
TDRs 43.6 $ 15.8  
Residential real estate – mortgage      
Accounts, Notes, Loans and Financing Receivable Including Other Real Estated Owned [Line Items]      
Other real estate owned $ 13.0   $ 14.0
Maximum      
Accounts, Notes, Loans and Financing Receivable Including Other Real Estated Owned [Line Items]      
Recognition of charge off expenses on consumer loans, period of time loan is past due 120 days    
Recognition of charge off expenses on residential loans, period of time loan is past due 180 days    
Recognition of charge off expenses on credit card loans, period of time loan is past due 180 days