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Loans - Schedule of Recorded Investment in Impaired Loans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]      
Loans and Leases Receivable, Impaired, Troubled Debt, Interest Income $ 3.0 $ 3.5 $ 4.2
Impaired Financing Receivable, Unpaid Principal Balance      
Unpaid Total Principal Balance 83.0 107.9 132.8
Recorded Investment With No Allowance 36.0 51.4 57.9
Recorded Investment With Allowance 28.8 31.8 46.8
Total Recorded Investment 64.8 83.2 104.7
Related Allowance 6.8 10.8 14.0
Average Recorded Investment 74.0 94.0 101.1
Income Recognized 0.3 0.5 0.6
Impaired Loans, interest lost on nonaccrual loans     3.4
Commercial      
Impaired Financing Receivable, Unpaid Principal Balance      
Unpaid Total Principal Balance 22.2 45.6 57.0
Recorded Investment With No Allowance 8.6 20.9 24.4
Recorded Investment With Allowance 7.7 14.1 21.4
Total Recorded Investment 16.3 35.0 45.8
Related Allowance 0.7 3.9 2.8
Land acquisition & development      
Impaired Financing Receivable, Unpaid Principal Balance      
Unpaid Total Principal Balance 10.0 10.0 12.1
Recorded Investment With No Allowance 0.4 3.4 4.3
Recorded Investment With Allowance 3.5 0.5 1.8
Total Recorded Investment 3.9 3.9 6.1
Related Allowance 0.2 0.0 0.8
Residential      
Impaired Financing Receivable, Unpaid Principal Balance      
Unpaid Total Principal Balance 1.1 1.8 1.6
Recorded Investment With No Allowance 0.6 1.7 0.2
Recorded Investment With Allowance 0.4 0.0 0.6
Total Recorded Investment 1.0 1.7 0.8
Related Allowance 0.1 0.0 0.0
Commercial      
Impaired Financing Receivable, Unpaid Principal Balance      
Unpaid Total Principal Balance 0.7 4.7 4.8
Recorded Investment With No Allowance 0.2 0.4 3.9
Recorded Investment With Allowance 0.0 3.5 0.7
Total Recorded Investment 0.2 3.9 4.6
Related Allowance 0.0 2.2 0.7
Total construction loans      
Impaired Financing Receivable, Unpaid Principal Balance      
Unpaid Total Principal Balance 11.8 16.5 18.5
Recorded Investment With No Allowance 1.2 5.5 8.4
Recorded Investment With Allowance 3.9 4.0 3.1
Total Recorded Investment 5.1 9.5 11.5
Related Allowance 0.3 2.2 1.5
Residential      
Impaired Financing Receivable, Unpaid Principal Balance      
Unpaid Total Principal Balance 8.8 11.5 8.2
Recorded Investment With No Allowance 5.7 8.2 4.1
Recorded Investment With Allowance 2.0 2.0 2.5
Total Recorded Investment 7.7 10.2 6.6
Related Allowance 0.3 0.1 0.3
Agricultural      
Impaired Financing Receivable, Unpaid Principal Balance      
Unpaid Total Principal Balance 12.9 3.7 5.1
Recorded Investment With No Allowance 12.5 3.6 4.5
Recorded Investment With Allowance 0.2 0.0 0.2
Total Recorded Investment 12.7 3.6 4.7
Related Allowance 0.0 0.0 0.0
Total real estate loans      
Impaired Financing Receivable, Unpaid Principal Balance      
Unpaid Total Principal Balance 55.7 77.3 88.8
Recorded Investment With No Allowance 28.0 38.2 41.4
Recorded Investment With Allowance 13.8 20.1 27.2
Total Recorded Investment 41.8 58.3 68.6
Related Allowance 1.3 6.2 4.6
Average Recorded Investment 50.0 63.5 69.2
Income Recognized 0.1 0.3 0.3
Commercial      
Impaired Financing Receivable, Unpaid Principal Balance      
Unpaid Total Principal Balance 24.1 29.5 40.3
Recorded Investment With No Allowance 5.5 12.4 13.2
Recorded Investment With Allowance 14.4 11.4 19.2
Total Recorded Investment 19.9 23.8 32.4
Related Allowance 5.2 4.4 9.3
Average Recorded Investment 21.9 28.1 30.1
Income Recognized 0.2 0.2 0.3
Agricultural      
Impaired Financing Receivable, Unpaid Principal Balance      
Unpaid Total Principal Balance 3.2 1.1 3.7
Recorded Investment With No Allowance 2.5 0.8 3.3
Recorded Investment With Allowance 0.6 0.3 0.4
Total Recorded Investment 3.1 1.1 3.7
Related Allowance 0.3 0.2 0.1
Average Recorded Investment 2.1 2.4 1.8
Income Recognized $ 0.0 $ 0.0 $ 0.0