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Loan Servicing - Mortgage Servicing Rights Activity (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Servicing Assets at Fair Value [Line Items]      
Mortgage banking operations $ 32.0 $ 22.0 $ 20.0
Mortgage Servicing Rights      
Servicing Assets at Fair Value [Line Items]      
SBA loans sold to investors with servicing retained 4,686.0 3,968.0  
Mortgage loans sold with servicing retained 1,381.0 1,060.0 1,769.0
Pretax gains resulting from above loan sales 32.0 19.0 22.0
Mortgage banking operations 11.0 9.0 8.0
Valuation allowance for impairment of recognized servicing assets, balance 1.5 0.5  
Servicing Asset at Amortized Cost, Balance [Roll Forward]      
Balance at beginning of period 37.0 29.0 14.0
Fair value of MSRs acquired 0.0 0.0 8.0
Additions 14.0 13.0 11.0
Payoffs and curtailments (5.0) (2.0) (2.0)
Impairment charge (1.0) (1.0) 0.0
Amortization (2.0) (2.0) (2.0)
Balance at end of period 43.0 37.0 29.0
Fair value, beginning of period 41.0 32.0 18.0
Fair value, end of period $ 45.0 $ 41.0 $ 32.0