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Loans - Schedule of Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses $ 19.5 $ 3.8 $ 48.5 $ 7.5
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 129.1 72.4 73.0 73.0
Loans Charged-Off (4.1) (5.6) (8.7) (11.6)
Recoveries Collected 1.8   3.3  
Ending balance 146.1 $ 74.2 146.1 $ 74.2
Non-owner occupied        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 7.9   9.9  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 15.7   8.8  
Loans Charged-Off 0.0   0.0  
Recoveries Collected 0.0   0.0  
Ending balance 23.6   23.6  
Owner occupied        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 3.4   5.6  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 15.7   10.0  
Loans Charged-Off (0.1)   (0.1)  
Recoveries Collected 0.1   0.1  
Ending balance 19.1   19.1  
Multi-family        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 0.4   0.9  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 8.1   0.7  
Loans Charged-Off 0.0   0.0  
Recoveries Collected 0.0   0.0  
Ending balance 8.5   8.5  
Commercial real estate        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 11.7   16.4  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 39.5   19.5  
Loans Charged-Off (0.1)   (0.1)  
Recoveries Collected 0.1   0.1  
Ending balance 51.2   51.2  
Agricultural        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 0.1   0.0  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 1.1   1.6  
Loans Charged-Off (0.1)   (0.1)  
Recoveries Collected 0.0   0.0  
Ending balance 0.9   0.9  
Commercial and floor plans        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 7.7   21.2  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 33.5   25.5  
Loans Charged-Off (0.6)   (1.4)  
Recoveries Collected 0.4   0.8  
Ending balance 41.0   41.0  
Commercial purpose secured by 1-4 family        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 0.6   3.0  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 4.4   5.9  
Loans Charged-Off 0.0   (0.1)  
Recoveries Collected 0.1   0.1  
Ending balance 5.1   5.1  
Land acquisition & development        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 0.1   0.2  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 1.4   1.9  
Loans Charged-Off 0.0   (0.5)  
Recoveries Collected 0.0   0.0  
Ending balance 1.5   1.5  
Residential construction        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 0.2   0.7  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 1.1   1.5  
Loans Charged-Off 0.0   0.0  
Recoveries Collected 0.0   0.0  
Ending balance 1.3   1.3  
Commercial construction        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 0.2   2.3  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 6.1   2.7  
Loans Charged-Off 0.0   0.0  
Recoveries Collected 0.0   0.0  
Ending balance 6.3   6.3  
Total construction        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 0.5   3.2  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 8.6   6.1  
Loans Charged-Off 0.0   (0.5)  
Recoveries Collected 0.0   0.0  
Ending balance 9.1   9.1  
Residential 1-4 family        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 2.7   2.2  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 12.9   1.8  
Loans Charged-Off 0.0   0.0  
Recoveries Collected 0.1   0.1  
Ending balance 10.3   10.3  
Home equity and HELOC        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 0.0   0.1  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 1.4   1.0  
Loans Charged-Off 0.0   0.0  
Recoveries Collected 0.1   0.1  
Ending balance 1.5   1.5  
Residential        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 2.7   2.3  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 14.3   2.8  
Loans Charged-Off 0.0   0.0  
Recoveries Collected 0.2   0.2  
Ending balance 11.8   11.8  
Agricultural        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 0.5   0.8  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 2.6   0.5  
Loans Charged-Off 0.0   0.0  
Recoveries Collected 0.0   0.0  
Ending balance 3.1   3.1  
Total real estate loans        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 10.0   18.1  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 65.0   28.9  
Loans Charged-Off (0.1)   (0.6)  
Recoveries Collected 0.3   0.3  
Ending balance 75.2   75.2  
Indirect consumer        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 0.5   4.4  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 16.7   4.5  
Loans Charged-Off (1.2)   (2.4)  
Recoveries Collected 0.4   1.1  
Ending balance 16.4   16.4  
Direct and advance lines        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 0.3   0.7  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 5.5   2.9  
Loans Charged-Off (1.0)   (2.0)  
Recoveries Collected 0.3   0.5  
Ending balance 5.1   5.1  
Credit card        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 0.0   0.4  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 2.6   2.5  
Loans Charged-Off (0.8)   (1.6)  
Recoveries Collected 0.2   0.4  
Ending balance 2.0   2.0  
Total consumer loans        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 0.8   5.5  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 24.8   9.9  
Loans Charged-Off (3.0)   (6.0)  
Recoveries Collected 0.9   2.0  
Ending balance 23.5   23.5  
Credit card        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 0.3   0.7  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 0.3   1.2  
Loans Charged-Off (0.3)   (0.5)  
Recoveries Collected 0.1   0.1  
Ending balance 0.4   0.4  
Commercial        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 8.6   24.9  
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 38.2   32.6  
Loans Charged-Off (0.9)   (2.0)  
Recoveries Collected 0.6   1.0  
Ending balance 46.5   46.5  
Agriculture Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Provision for credit losses 0.1      
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 1.1      
Loans Charged-Off (0.1)      
Recoveries Collected 0.0      
Ending balance 0.9   0.9  
Cumulative Effect, Period of Adoption, Adjustment [Member]        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance 30.0   30.0  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Non-owner occupied        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance 4.9   4.9  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Owner occupied        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance 3.5   3.5  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Multi-family        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance 6.9   6.9  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial real estate        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance 15.3   15.3  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Agricultural        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance (0.6)   (0.6)  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial and floor plans        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance (5.1)   (5.1)  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial purpose secured by 1-4 family        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance (3.8)   (3.8)  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Land acquisition & development        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance (0.1)   (0.1)  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Residential construction        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance (0.9)   (0.9)  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial construction        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance 1.3   1.3  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Total construction        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance 0.3   0.3  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Residential 1-4 family        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance 10.6   10.6  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Home equity and HELOC        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance 0.5   0.5  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Residential        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance 11.1   11.1  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Agricultural        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance 1.8   1.8  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Total real estate loans        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance 28.5   28.5  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Indirect consumer        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance 8.8   8.8  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Direct and advance lines        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance 3.0   3.0  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Credit card        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance 0.3   0.3  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Total consumer loans        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance 12.1   12.1  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Credit card        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance (1.1)   (1.1)  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Ending balance $ (10.0)   $ (10.0)