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Allowance for Loan Losses - Schedule of Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance $ 73.5 $ 76.2 $ 72.1 $ 76.2    
Provision charged to operating expense 2.9 2.4 5.0 4.1    
Less loans charged-off (5.0) (4.5) (10.2) (8.1)    
Add back recoveries of loans previously charged-off 2.7 1.6 7.2 3.5    
Ending balance 74.1 75.7 74.1 75.7    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         $ 10.5 $ 10.8
Loans collectively evaluated for impairment         63.6 61.3
Allowance for loan losses 73.5 76.2 72.1 76.2 74.1 72.1
Loans held for investment:            
Individually evaluated for impairment         81.7 83.2
Individually evaluated for impairment         7,626.7 7,484.5
Total loans         7,708.4 7,567.7
Allowance for credit losses due to subsequent impairment         0.5 1.0
Real Estate            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 33.8 33.1 31.6 28.6    
Provision charged to operating expense 0.6 1.1 2.4 5.5    
Less loans charged-off (1.3) (1.0) (2.1) (1.2)    
Add back recoveries of loans previously charged-off 0.8 0.3 2.0 0.6    
Ending balance 33.9 33.5 33.9 33.5    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         5.9 6.2
Loans collectively evaluated for impairment         28.0 25.4
Allowance for loan losses 33.8 33.1 31.6 28.6 33.9 31.6
Loans held for investment:            
Individually evaluated for impairment         58.9 58.3
Individually evaluated for impairment         5,174.0 5,118.5
Total loans         5,232.9 5,176.8
Consumer            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 7.8 8.4 8.7 7.7    
Provision charged to operating expense 1.5 0.5 2.2 2.5    
Less loans charged-off (2.8) (2.4) (5.5) (5.0)    
Add back recoveries of loans previously charged-off 1.3 1.1 2.4 2.4    
Ending balance 7.8 7.6 7.8 7.6    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         0.0 0.0
Loans collectively evaluated for impairment         7.8 8.7
Allowance for loan losses 7.8 8.4 8.7 7.7 7.8 8.7
Loans held for investment:            
Individually evaluated for impairment         0.0 0.0
Individually evaluated for impairment         1,055.2 1,034.4
Total loans         1,055.2 1,034.4
Commercial            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 30.2 33.5 30.6 38.1    
Provision charged to operating expense 0.7 0.5 0.0 (3.7)    
Less loans charged-off (0.9) (1.1) (2.6) (1.8)    
Add back recoveries of loans previously charged-off 0.6 0.2 2.6 0.5    
Ending balance 30.6 33.1 30.6 33.1    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         4.4 4.4
Loans collectively evaluated for impairment         26.2 26.2
Allowance for loan losses 30.2 33.5 30.6 38.1 30.6 30.6
Loans held for investment:            
Individually evaluated for impairment         21.1 23.8
Individually evaluated for impairment         1,244.9 1,191.6
Total loans         1,266.0 1,215.4
Agriculture            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 1.7 1.2 1.2 1.8    
Provision charged to operating expense 0.1 0.3 0.4 (0.2)    
Less loans charged-off 0.0 0.0 0.0 (0.1)    
Add back recoveries of loans previously charged-off 0.0 0.0 0.2 0.0    
Ending balance 1.8 1.5 1.8 1.5    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         0.2 0.2
Loans collectively evaluated for impairment         1.6 1.0
Allowance for loan losses 1.7 1.2 1.2 1.8 1.8 1.2
Loans held for investment:            
Individually evaluated for impairment         1.7 1.1
Individually evaluated for impairment         149.5 135.1
Total loans         151.2 136.2
Other            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 0.0 0.0 0.0 0.0    
Provision charged to operating expense 0.0 0.0 0.0 0.0    
Less loans charged-off 0.0 0.0 0.0 0.0    
Add back recoveries of loans previously charged-off 0.0 0.0 0.0 0.0    
Ending balance 0.0 0.0 0.0 0.0    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         0.0 0.0
Loans collectively evaluated for impairment         0.0 0.0
Allowance for loan losses $ 0.0 $ 0.0 $ 0.0 $ 0.0 0.0 0.0
Loans held for investment:            
Individually evaluated for impairment         0.0 0.0
Individually evaluated for impairment         3.1 4.9
Total loans         $ 3.1 $ 4.9