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Loans - Schedule of Recorded Investment in Past Due Loans by Class (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Loans and Leases Receivable Recorded Investment, Past Due      
Impaired Loans, interest lost on nonaccrual loans $ 3.5    
Loans held for investment   $ 8,930.7 $ 8,470.4
Total loans   9,031.6 8,503.7
Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   7.2 12.2
Current Loans   3,464.5 3,214.0
Non-accrual Loans   13.0 9.2
Loans held for investment   3,484.7 3,235.4
Land Acquisition And Development Construction Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   1.8 1.9
Current Loans   298.9 316.0
Non-accrual Loans   1.4 3.7
Loans held for investment   302.1 321.6
Residential      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   2.3 1.4
Current Loans   241.8 240.4
Non-accrual Loans   0.0 1.0
Loans held for investment   244.1 242.8
Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.0 0.4
Current Loans   431.0 273.7
Non-accrual Loans   0.5 0.2
Loans held for investment   431.5 274.3
Total construction loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   4.1 3.7
Current Loans   971.7 830.1
Non-accrual Loans   1.9 4.9
Loans held for investment   977.7 838.7
Residential      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   6.3 10.1
Current Loans   1,535.2 1,525.3
Non-accrual Loans   4.6 6.6
Loans held for investment   1,546.1 1,542.0
Agricultural      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   1.3 2.2
Current Loans   220.1 202.6
Non-accrual Loans   5.2 12.6
Loans held for investment   226.6 217.4
Total real estate loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   18.9 28.2
Current Loans   6,191.5 5,772.0
Non-accrual Loans   24.7 33.3
Loans held for investment   6,235.1 5,833.5
Indirect consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   10.0 9.3
Current Loans   773.0 776.8
Non-accrual Loans   1.6 1.7
Loans held for investment   784.6 787.8
Other consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   1.8 2.0
Current Loans   176.7 198.1
Non-accrual Loans   0.5 0.5
Loans held for investment   179.0 200.6
Credit card consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   2.1 2.1
Current Loans   79.5 79.7
Non-accrual Loans   0.0 0.0
Loans held for investment   81.6 81.8
Total consumer loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   13.9 13.4
Current Loans   1,029.2 1,054.6
Non-accrual Loans   2.1 2.2
Loans held for investment   1,045.2 1,070.2
Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   9.7 10.8
Current Loans   1,347.9 1,283.7
Non-accrual Loans   13.7 15.8
Loans held for investment   1,371.3 1,310.3
Agricultural      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   1.0 2.4
Current Loans   275.7 249.4
Non-accrual Loans   2.4 3.0
Loans held for investment   279.1 254.8
Other, including overdrafts      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.0 0.0
Current Loans   0.0 1.6
Non-accrual Loans   0.0 0.0
Loans held for investment   0.0 1.6
Loans held for investment      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   43.5 54.8
Current Loans   8,844.3 8,361.3
Non-accrual Loans   42.9 54.3
Loans held for investment   8,930.7 8,470.4
Mortgage loans originated for sale      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.0 0.0
Current Loans   100.9 33.3
Non-accrual Loans   0.0 0.0
Total loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   43.5 54.8
Current Loans   8,945.2 8,394.6
Non-accrual Loans   42.9 54.3
Total loans   9,031.6 8,503.7
Financing Receivables, 30 to 59 Days Past Due | Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   5.5 10.4
Financing Receivables, 30 to 59 Days Past Due | Land Acquisition And Development Construction Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.7 1.6
Financing Receivables, 30 to 59 Days Past Due | Residential      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   1.5 1.0
Financing Receivables, 30 to 59 Days Past Due | Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.0 0.4
Financing Receivables, 30 to 59 Days Past Due | Total construction loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   2.2 3.0
Financing Receivables, 30 to 59 Days Past Due | Residential      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   3.8 8.8
Financing Receivables, 30 to 59 Days Past Due | Agricultural      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.8 2.2
Financing Receivables, 30 to 59 Days Past Due | Total real estate loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   12.3 24.4
Financing Receivables, 30 to 59 Days Past Due | Indirect consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   7.6 6.8
Financing Receivables, 30 to 59 Days Past Due | Other consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   1.2 1.4
Financing Receivables, 30 to 59 Days Past Due | Credit card consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.8 0.9
Financing Receivables, 30 to 59 Days Past Due | Total consumer loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   9.6 9.1
Financing Receivables, 30 to 59 Days Past Due | Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   4.8 8.3
Financing Receivables, 30 to 59 Days Past Due | Agricultural      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.9 2.1
Financing Receivables, 30 to 59 Days Past Due | Other, including overdrafts      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.0 0.0
Financing Receivables, 30 to 59 Days Past Due | Loans held for investment      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   27.6 43.9
Financing Receivables, 30 to 59 Days Past Due | Mortgage loans originated for sale      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.0 0.0
Financing Receivables, 30 to 59 Days Past Due | Total loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   27.6 43.9
Financing Receivables, 60 to 89 Days Past Due | Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   1.1 1.0
Financing Receivables, 60 to 89 Days Past Due | Land Acquisition And Development Construction Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.8 0.1
Financing Receivables, 60 to 89 Days Past Due | Residential      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.8 0.4
Financing Receivables, 60 to 89 Days Past Due | Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.0 0.0
Financing Receivables, 60 to 89 Days Past Due | Total construction loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   1.6 0.5
Financing Receivables, 60 to 89 Days Past Due | Residential      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   1.4 1.1
Financing Receivables, 60 to 89 Days Past Due | Agricultural      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.5 0.0
Financing Receivables, 60 to 89 Days Past Due | Total real estate loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   4.6 2.6
Financing Receivables, 60 to 89 Days Past Due | Indirect consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   1.9 2.1
Financing Receivables, 60 to 89 Days Past Due | Other consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.5 0.5
Financing Receivables, 60 to 89 Days Past Due | Credit card consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.5 0.4
Financing Receivables, 60 to 89 Days Past Due | Total consumer loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   2.9 3.0
Financing Receivables, 60 to 89 Days Past Due | Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   2.6 1.2
Financing Receivables, 60 to 89 Days Past Due | Agricultural      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.1 0.3
Financing Receivables, 60 to 89 Days Past Due | Other, including overdrafts      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.0 0.0
Financing Receivables, 60 to 89 Days Past Due | Loans held for investment      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   10.2 7.1
Financing Receivables, 60 to 89 Days Past Due | Mortgage loans originated for sale      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.0 0.0
Financing Receivables, 60 to 89 Days Past Due | Total loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   10.2 7.1
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.6 0.8
Financing Receivables, Equal to Greater than 90 Days Past Due | Land Acquisition And Development Construction Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.3 0.2
Financing Receivables, Equal to Greater than 90 Days Past Due | Residential      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.0 0.0
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.0 0.0
Financing Receivables, Equal to Greater than 90 Days Past Due | Total construction loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.3 0.2
Financing Receivables, Equal to Greater than 90 Days Past Due | Residential      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   1.1 0.2
Financing Receivables, Equal to Greater than 90 Days Past Due | Agricultural      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.0 0.0
Financing Receivables, Equal to Greater than 90 Days Past Due | Total real estate loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   2.0 1.2
Financing Receivables, Equal to Greater than 90 Days Past Due | Indirect consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.5 0.4
Financing Receivables, Equal to Greater than 90 Days Past Due | Other consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.1 0.1
Financing Receivables, Equal to Greater than 90 Days Past Due | Credit card consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.8 0.8
Financing Receivables, Equal to Greater than 90 Days Past Due | Total consumer loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   1.4 1.3
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   2.3 1.3
Financing Receivables, Equal to Greater than 90 Days Past Due | Agricultural      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.0 0.0
Financing Receivables, Equal to Greater than 90 Days Past Due | Other, including overdrafts      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.0 0.0
Financing Receivables, Equal to Greater than 90 Days Past Due | Loans held for investment      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   5.7 3.8
Financing Receivables, Equal to Greater than 90 Days Past Due | Mortgage loans originated for sale      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   0.0 0.0
Financing Receivables, Equal to Greater than 90 Days Past Due | Total loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due   $ 5.7 $ 3.8