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Allowance for Loan Losses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance $ 72.4 $ 73.5 $ 73.0 $ 72.1    
Provision charged to operating expense 3.8 2.9 7.5 5.0    
Less loans charged-off (5.6) (5.0) (11.6) (10.2)    
Add back recoveries of loans previously charged-off 3.6 2.7 5.3 7.2    
Ending balance 74.2 74.1 74.2 74.1    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         $ 6.2 $ 6.8
Loans collectively evaluated for impairment         68.0 66.2
Allowance for loan losses 72.4 73.5 74.2 74.1 74.2 73.0
Loans held for investment:            
Individually evaluated for impairment         56.9 64.8
Collectively evaluated for impairment         8,938.3 8,405.6
Total loans held for investment         8,995.2 8,470.4
Amount related to loans acquired credit impaired         0.8 0.8
Real Estate            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 27.4 33.9 31.0 31.7    
Provision charged to operating expense 0.0 0.6 (1.7) 2.4    
Less loans charged-off (0.9) (1.3) (3.0) (2.1)    
Add back recoveries of loans previously charged-off 1.2 0.8 1.4 2.0    
Ending balance 27.7 34.0 27.7 34.0    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         1.3 1.3
Loans collectively evaluated for impairment         26.4 29.7
Allowance for loan losses 27.4 33.9 27.7 31.7 27.7 31.0
Loans held for investment:            
Individually evaluated for impairment         30.9 41.8
Collectively evaluated for impairment         6,141.3 5,791.7
Total loans held for investment         6,172.2 5,833.5
Consumer            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 8.8 7.8 8.7 8.7    
Provision charged to operating expense 2.4 1.5 4.4 2.2    
Less loans charged-off (3.3) (2.8) (6.3) (5.5)    
Add back recoveries of loans previously charged-off 1.2 1.3 2.3 2.4    
Ending balance 9.1 7.8 9.1 7.8    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         0.0 0.0
Loans collectively evaluated for impairment         9.1 8.7
Allowance for loan losses 8.8 7.8 8.7 7.8 9.1 8.7
Loans held for investment:            
Individually evaluated for impairment         0.0 0.0
Collectively evaluated for impairment         1,076.0 1,070.2
Total loans held for investment         1,076.0 1,070.2
Commercial            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 34.5 30.1 31.3 30.5    
Provision charged to operating expense 1.1 0.7 4.7 0.0    
Less loans charged-off (1.1) (0.9) (1.9) (2.6)    
Add back recoveries of loans previously charged-off 1.2 0.6 1.6 2.6    
Ending balance 35.7 30.5 35.7 30.5    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         4.6 5.2
Loans collectively evaluated for impairment         31.1 26.1
Allowance for loan losses 34.5 30.1 35.7 30.5 35.7 31.3
Loans held for investment:            
Individually evaluated for impairment         19.3 19.9
Collectively evaluated for impairment         1,447.4 1,290.4
Total loans held for investment         1,466.7 1,310.3
Agriculture            
Allowance for Loan and Lease Losses [Roll Forward]            
Beginning balance 1.7 1.7 2.0 1.2    
Provision charged to operating expense 0.3 0.1 0.1 0.4    
Less loans charged-off (0.3) 0.0 (0.4) 0.0    
Add back recoveries of loans previously charged-off 0.0 0.0 0.0 0.2    
Ending balance 1.7 1.8 1.7 1.8    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]            
Loans individually evaluated for impairment         0.3 0.3
Loans collectively evaluated for impairment         1.4 1.7
Allowance for loan losses 1.7 1.7 1.7 1.2 1.7 2.0
Loans held for investment:            
Individually evaluated for impairment         6.7 3.1
Collectively evaluated for impairment         270.9 251.7
Total loans held for investment         277.6 254.8
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
Collectively evaluated for impairment         2.7 1.6
Total loans held for investment         $ 2.7 $ 1.6