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Loans - Schedule of Recorded Investment in Impaired Loans (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]          
Loans and Leases Receivable, Impaired, Troubled Debt, Interest Income $ 3.0 $ 2.5      
Impaired Financing Receivable, Unpaid Principal Balance          
Unpaid Total Principal Balance   87.4 $ 107.9   $ 83.0
Recorded Investment With No Allowance   37.2 51.4   36.0
Recorded Investment With Allowance   27.5 31.8   28.8
Total Recorded Investment   64.7 83.2   64.8
Related Allowance   3.6 10.8   6.8
Average Recorded Investment 74.0 64.7   $ 94.0  
Income Recognized 0.3 0.3   0.5  
Impaired Loans, interest lost on nonaccrual loans     3.5    
Commercial          
Impaired Financing Receivable, Unpaid Principal Balance          
Unpaid Total Principal Balance   29.2 45.6   22.2
Recorded Investment With No Allowance   12.9 20.9   8.6
Recorded Investment With Allowance   10.8 14.1   7.7
Total Recorded Investment   23.7 35.0   16.3
Related Allowance   0.7 3.9   0.7
Land Acquisition & Development Construction Financing Receivable [Member]          
Impaired Financing Receivable, Unpaid Principal Balance          
Unpaid Total Principal Balance     10.0    
Recorded Investment With No Allowance     3.4    
Recorded Investment With Allowance     0.5    
Total Recorded Investment     3.9    
Related Allowance     0.0    
Land Acquisition And Development Construction Financing Receivable [Member]          
Impaired Financing Receivable, Unpaid Principal Balance          
Unpaid Total Principal Balance   9.2     10.0
Recorded Investment With No Allowance   0.4     0.4
Recorded Investment With Allowance   2.6     3.5
Total Recorded Investment   3.0     3.9
Related Allowance   0.5     0.2
Residential          
Impaired Financing Receivable, Unpaid Principal Balance          
Unpaid Total Principal Balance   0.1 1.8   1.1
Recorded Investment With No Allowance   0.0 1.7   0.6
Recorded Investment With Allowance   0.0 0.0   0.4
Total Recorded Investment   0.0 1.7   1.0
Related Allowance   0.0 0.0   0.1
Commercial          
Impaired Financing Receivable, Unpaid Principal Balance          
Unpaid Total Principal Balance   1.0 4.7   0.7
Recorded Investment With No Allowance   0.5 0.4   0.2
Recorded Investment With Allowance   0.0 3.5   0.0
Total Recorded Investment   0.5 3.9   0.2
Related Allowance   0.1 2.2   0.0
Total construction loans          
Impaired Financing Receivable, Unpaid Principal Balance          
Unpaid Total Principal Balance   10.3 16.5   11.8
Recorded Investment With No Allowance   0.9 5.5   1.2
Recorded Investment With Allowance   2.6 4.0   3.9
Total Recorded Investment   3.5 9.5   5.1
Related Allowance   0.6 2.2   0.3
Residential          
Impaired Financing Receivable, Unpaid Principal Balance          
Unpaid Total Principal Balance   6.9 11.5   8.8
Recorded Investment With No Allowance   3.9 8.2   5.7
Recorded Investment With Allowance   1.8 2.0   2.0
Total Recorded Investment   5.7 10.2   7.7
Related Allowance   0.2 0.1   0.3
Agricultural          
Impaired Financing Receivable, Unpaid Principal Balance          
Unpaid Total Principal Balance   8.6 3.7   12.9
Recorded Investment With No Allowance   5.2 3.6   12.5
Recorded Investment With Allowance   3.0 0.0   0.2
Total Recorded Investment   8.2 3.6   12.7
Related Allowance   0.2 0.0   0.0
Total real estate loans          
Impaired Financing Receivable, Unpaid Principal Balance          
Unpaid Total Principal Balance   55.0 77.3   55.7
Recorded Investment With No Allowance   22.9 38.2   28.0
Recorded Investment With Allowance   18.2 20.1   13.8
Total Recorded Investment   41.1 58.3   41.8
Related Allowance   1.7 6.2   1.3
Average Recorded Investment 50.0 41.4   63.5  
Income Recognized 0.1 0.1   0.3  
Commercial          
Impaired Financing Receivable, Unpaid Principal Balance          
Unpaid Total Principal Balance   25.5 29.5   24.1
Recorded Investment With No Allowance   12.0 12.4   5.5
Recorded Investment With Allowance   5.3 11.4   14.4
Total Recorded Investment   17.3 23.8   19.9
Related Allowance   1.7 4.4   5.2
Average Recorded Investment 21.9 18.7   28.1  
Income Recognized 0.2 0.2   0.2  
Agricultural          
Impaired Financing Receivable, Unpaid Principal Balance          
Unpaid Total Principal Balance   6.9 1.1   3.2
Recorded Investment With No Allowance   2.3 0.8   2.5
Recorded Investment With Allowance   4.0 0.3   0.6
Total Recorded Investment   6.3 1.1   3.1
Related Allowance   0.2 $ 0.2   $ 0.3
Average Recorded Investment 2.1 4.6   2.4  
Income Recognized $ 0.0 $ 0.0   $ 0.0