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Allowance for Loan Losses - Schedule of Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses     $ 0.9 $ 0.8
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning balance $ 73.0 $ 72.1    
Provision for loan losses 3.7 2.1    
Less loans charged-off (6.0) 5.2    
Add back recoveries of loans previously charged-off 1.7 4.5    
Ending balance 72.4 73.5    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Loans individually evaluated for impairment     7.1 6.8
Loans collectively evaluated for impairment     65.3 66.2
Allowance for loan losses 73.0 72.1 72.4 73.0
Loans held for investment:        
Individually evaluated for impairment     61.2 64.8
Individually evaluated for impairment     8,398.0 8,405.6
Total loans     8,459.2 8,470.4
Real Estate        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning balance 31.0 31.7    
Provision for loan losses (1.7) 1.8    
Less loans charged-off (2.1) 0.8    
Add back recoveries of loans previously charged-off 0.2 1.2    
Ending balance 27.4 33.9    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Allowance for loan losses 31.0 31.7 27.4 31.0
Consumer        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning balance 8.7 8.7    
Provision for loan losses 2.0 0.7    
Less loans charged-off (3.0) 2.7    
Add back recoveries of loans previously charged-off 1.1 1.1    
Ending balance 8.8 7.8    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Allowance for loan losses 8.7 8.7 8.8 8.7
Commercial        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning balance 31.3 30.5    
Provision for loan losses 3.6 (0.7)    
Less loans charged-off (0.8) 1.7    
Add back recoveries of loans previously charged-off 0.4 2.0    
Ending balance 34.5 30.1    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Allowance for loan losses 31.3 30.5 34.5 31.3
Agriculture        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning balance 2.0 1.2    
Provision for loan losses (0.2) 0.3    
Less loans charged-off (0.1) 0.0    
Add back recoveries of loans previously charged-off 0.0 0.2    
Ending balance 1.7 1.7    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Allowance for loan losses 2.0 1.2 1.7 2.0
Other        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning balance 0.0 0.0    
Provision for loan losses 0.0 0.0    
Less loans charged-off 0.0 0.0    
Add back recoveries of loans previously charged-off 0.0 0.0    
Ending balance 0.0 0.0    
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Allowance for loan losses 0.0 $ 0.0 0.0 0.0
Other        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning balance 0.0      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Loans individually evaluated for impairment       0.0
Loans collectively evaluated for impairment       0.0
Allowance for loan losses 0.0     0.0
Loans held for investment:        
Individually evaluated for impairment       0.0
Individually evaluated for impairment       1.6
Total loans       1.6
Other | Other        
Allowance for Loan and Lease Losses [Roll Forward]        
Ending balance 0.0      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Loans individually evaluated for impairment     0.0  
Loans collectively evaluated for impairment     0.0  
Allowance for loan losses 0.0   0.0  
Loans held for investment:        
Individually evaluated for impairment     0.0  
Individually evaluated for impairment     1.8  
Total loans     1.8  
Agriculture        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning balance 2.0      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Loans individually evaluated for impairment       0.3
Loans collectively evaluated for impairment       1.7
Allowance for loan losses 2.0     2.0
Loans held for investment:        
Individually evaluated for impairment       3.1
Individually evaluated for impairment       251.7
Total loans       254.8
Agriculture | Agriculture        
Allowance for Loan and Lease Losses [Roll Forward]        
Ending balance 1.7      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Loans individually evaluated for impairment     0.5  
Loans collectively evaluated for impairment     1.2  
Allowance for loan losses 1.7   1.7  
Loans held for investment:        
Individually evaluated for impairment     4.8  
Individually evaluated for impairment     229.9  
Total loans     234.7  
Commercial        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning balance 31.3      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Loans individually evaluated for impairment       5.2
Loans collectively evaluated for impairment       26.1
Allowance for loan losses 31.3     31.3
Loans held for investment:        
Individually evaluated for impairment       19.9
Individually evaluated for impairment       1,290.4
Total loans       1,310.3
Commercial | Commercial        
Allowance for Loan and Lease Losses [Roll Forward]        
Ending balance 34.5      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Loans individually evaluated for impairment     5.1  
Loans collectively evaluated for impairment     29.4  
Allowance for loan losses 34.5   34.5  
Loans held for investment:        
Individually evaluated for impairment     19.8  
Individually evaluated for impairment     1,322.3  
Total loans     1,342.1  
Consumer        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning balance 8.7      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Loans individually evaluated for impairment       0.0
Loans collectively evaluated for impairment       8.7
Allowance for loan losses 8.7     8.7
Loans held for investment:        
Individually evaluated for impairment       0.0
Individually evaluated for impairment       1,070.2
Total loans       1,070.2
Consumer | Consumer        
Allowance for Loan and Lease Losses [Roll Forward]        
Ending balance 8.8      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Loans individually evaluated for impairment     0.0  
Loans collectively evaluated for impairment     8.8  
Allowance for loan losses 8.8   8.8  
Loans held for investment:        
Individually evaluated for impairment     0.0  
Individually evaluated for impairment     1,047.0  
Total loans     1,047.0  
Real Estate        
Allowance for Loan and Lease Losses [Roll Forward]        
Beginning balance 31.0      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Loans individually evaluated for impairment       1.3
Loans collectively evaluated for impairment       29.7
Allowance for loan losses 31.0     31.0
Loans held for investment:        
Individually evaluated for impairment       41.8
Individually evaluated for impairment       5,791.7
Total loans       $ 5,833.5
Real Estate | Real Estate        
Allowance for Loan and Lease Losses [Roll Forward]        
Ending balance 27.4      
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]        
Loans individually evaluated for impairment     1.5  
Loans collectively evaluated for impairment     25.9  
Allowance for loan losses $ 27.4   27.4  
Loans held for investment:        
Individually evaluated for impairment     36.6  
Individually evaluated for impairment     5,797.0  
Total loans     $ 5,833.6