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Allowance for Loan Losses - Schedule of Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance $ 74.1 $ 75.7 $ 72.1 $ 76.2    
Provision charged to operating expense 2.0 3.4 7.0 7.5    
Less loans charged-off (4.8) (7.4) (15.1) (15.7)    
Add back recoveries of loans previously charged-off 2.3 2.9 9.6 6.6    
Ending balance 73.6 74.6 73.6 74.6    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         $ 8.2 $ 10.8
Loans collectively evaluated for impairment         65.4 61.3
Allowance for loan losses 74.1 75.7 72.1 76.2 73.6 72.1
Loans held for investment:            
Individually evaluated for impairment         72.4 83.2
Individually evaluated for impairment         8,407.9 7,484.5
Total loans         8,480.3 7,567.7
Allowance for credit losses due to subsequent impairment         0.6 1.0
Real Estate            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 33.9 33.5 31.6 28.6    
Provision charged to operating expense (0.9) (0.7) 1.4 4.8    
Less loans charged-off (0.7) (1.7) (2.8) (3.0)    
Add back recoveries of loans previously charged-off 0.6 0.6 2.7 1.3    
Ending balance 32.9 31.7 32.9 31.7    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         3.6 6.2
Loans collectively evaluated for impairment         29.3 25.4
Allowance for loan losses 33.9 33.5 31.6 28.6 32.9 31.6
Loans held for investment:            
Individually evaluated for impairment         49.8 58.3
Individually evaluated for impairment         5,747.0 5,118.5
Total loans         5,796.8 5,176.8
Consumer            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 7.8 7.6 8.7 7.7    
Provision charged to operating expense 2.4 2.6 4.7 5.2    
Less loans charged-off (3.0) (3.1) (8.6) (8.1)    
Add back recoveries of loans previously charged-off 1.2 1.0 3.6 3.3    
Ending balance 8.4 8.1 8.4 8.1    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         0.0 0.0
Loans collectively evaluated for impairment         8.4 8.7
Allowance for loan losses 7.8 7.6 8.7 7.7 8.4 8.7
Loans held for investment:            
Individually evaluated for impairment         0.0 0.0
Individually evaluated for impairment         1,078.3 1,034.4
Total loans         1,078.3 1,034.4
Commercial            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 30.6 33.1 30.6 38.1    
Provision charged to operating expense 0.5 1.5 0.5 (2.2)    
Less loans charged-off (1.1) (2.6) (3.7) (4.5)    
Add back recoveries of loans previously charged-off 0.5 1.3 3.1 1.9    
Ending balance 30.5 33.3 30.5 33.3    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         4.4 4.4
Loans collectively evaluated for impairment         26.1 26.2
Allowance for loan losses 30.6 33.1 30.6 38.1 30.5 30.6
Loans held for investment:            
Individually evaluated for impairment         20.4 23.8
Individually evaluated for impairment         1,316.8 1,191.6
Total loans         1,337.2 1,215.4
Agriculture            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 1.8 1.5 1.2 1.8    
Provision charged to operating expense 0.0 0.0 0.4 (0.3)    
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 0.1    
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 1.8 1.5 1.2 1.8 1.8 1.2
Loans held for investment:            
Individually evaluated for impairment         2.2 1.1
Individually evaluated for impairment         262.6 135.1
Total loans         264.8 136.2
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         3.2 4.9
Total loans         $ 3.2 $ 4.9