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Loans - Schedule of Recorded Investment in Past Due Loans by Class (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Loans and Leases Receivable Recorded Investment, Past Due      
Total loans $ 9,807.5 $ 8,930.7  
Impaired Financing Receivable, Interest Income, Accrual Method 0.0 0.3 $ 0.3
Financing Receivable, Allowance for Credit Loss, Writeoff 0.0    
Loans and Leases Receivable, Nonperforming, Accrual of Interest 0.0    
Commercial Real Estate Portfolio Segment [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 12.8 7.2  
Current Loans 3,720.8 3,467.6  
Non-accrual Loans 9.6 13.0  
Loans held for investment 3,743.2 3,487.8  
Land Acquisition And Development Construction Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 3.7 1.8  
Current Loans 260.6 298.9  
Non-accrual Loans 0.7 1.4  
Loans held for investment 265.0 302.1  
Total loans 265.0    
Residential Real Estate Construction Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 1.9 2.3  
Current Loans 247.9 241.8  
Non-accrual Loans 1.1 0.0  
Loans held for investment 250.9 244.1  
Total loans 250.9    
Commercial Real Estate Construction [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 12.2 0.0  
Current Loans 511.2 431.0  
Non-accrual Loans 0.1 0.5  
Loans held for investment 523.5 431.5  
Total loans 523.5    
Real Estate Construction Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 17.8 4.1  
Current Loans 1,019.7 971.7  
Non-accrual Loans 1.9 1.9  
Loans held for investment 1,039.4 977.7  
Residential Mortgage [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 6.8 6.3  
Current Loans 1,384.9 1,235.2  
Non-accrual Loans 4.6 4.6  
Loans held for investment 1,396.3 1,246.1  
Agricultural Real Estate Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 2.0 1.3  
Current Loans 212.4 220.1  
Non-accrual Loans 6.2 5.2  
Loans held for investment 220.6 226.6  
Total loans 220.6    
Real Estate Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 39.4 18.9  
Current Loans 6,337.8 5,894.6  
Non-accrual Loans 22.3 24.7  
Loans held for investment 6,399.5 5,938.2  
Impaired Financing Receivable, Interest Income, Accrual Method   0.1 0.1
Indirect consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 8.9 10.0  
Current Loans 794.3 773.0  
Non-accrual Loans 1.9 1.6  
Loans held for investment 805.1 784.6  
Total loans 805.1    
Other consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 1.2 1.8  
Current Loans 149.0 176.7  
Non-accrual Loans 0.4 0.5  
Loans held for investment 150.6 179.0  
Total loans 150.6    
Credit card consumer      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 1.6 2.1  
Current Loans 68.6 79.5  
Non-accrual Loans 0.0 0.0  
Loans held for investment 70.2 81.6  
Total consumer loans      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 11.7 13.9  
Current Loans 1,011.9 1,029.2  
Non-accrual Loans 2.3 2.1  
Loans held for investment 1,025.9 1,045.2  
Commercial Portfolio Segment [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 9.2 9.7  
Current Loans 2,132.9 1,650.3  
Non-accrual Loans 11.8 13.7  
Loans held for investment 2,153.9 1,673.7  
Impaired Financing Receivable, Interest Income, Accrual Method   0.2 0.2
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 1.6 0.0  
Non-accrual Loans 0.0 0.0  
Loans held for investment 1.6 0.0  
Loans held for investment      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 62.7 43.5  
Current Loans 9,726.3 8,849.8  
Non-accrual Loans 39.5 42.9  
Loans held for investment 9,828.5 8,936.2  
Agricultural Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 2.4 1.0  
Current Loans 242.1 275.7  
Non-accrual Loans 3.1 2.4  
Loans held for investment 247.6 279.1  
Impaired Financing Receivable, Interest Income, Accrual Method   0.0 $ 0.0
Financing Receivables, 30 to 59 Days Past Due | Commercial Real Estate Portfolio Segment [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 7.6 5.5  
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 2.5 0.7  
Financing Receivables, 30 to 59 Days Past Due | Residential Real Estate Construction Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 1.5 1.5  
Financing Receivables, 30 to 59 Days Past Due | Commercial Real Estate Construction [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 12.2 0.0  
Financing Receivables, 30 to 59 Days Past Due | Real Estate Construction Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 16.2 2.2  
Financing Receivables, 30 to 59 Days Past Due | Residential Mortgage [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 4.7 3.8  
Financing Receivables, 30 to 59 Days Past Due | Agricultural Real Estate Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 2.0 0.8  
Financing Receivables, 30 to 59 Days Past Due | Real Estate Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 30.5 12.3  
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 6.4 7.6  
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 0.8 1.2  
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 0.6 0.8  
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 7.8 9.6  
Financing Receivables, 30 to 59 Days Past Due | Commercial Portfolio Segment [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 6.2 4.8  
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 44.9 27.6  
Financing Receivables, 30 to 59 Days Past Due | Agricultural Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0.4 0.9  
Financing Receivables, 60 to 89 Days Past Due | Commercial Real Estate Portfolio Segment [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 1.2 1.1  
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 1.1 0.8  
Financing Receivables, 60 to 89 Days Past Due | Residential Real Estate Construction Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0.4 0.8  
Financing Receivables, 60 to 89 Days Past Due | Commercial Real Estate Construction [Member]      
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 | Real Estate Construction Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 1.5 1.6  
Financing Receivables, 60 to 89 Days Past Due | Residential Mortgage [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 1.6 1.4  
Financing Receivables, 60 to 89 Days Past Due | Agricultural Real Estate Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0.0 0.5  
Financing Receivables, 60 to 89 Days Past Due | Real Estate Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 4.3 4.6  
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 2.0 1.9  
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 0.2 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 0.4 0.5  
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 2.6 2.9  
Financing Receivables, 60 to 89 Days Past Due | Commercial Portfolio Segment [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 1.8 2.6  
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 9.3 10.2  
Financing Receivables, 60 to 89 Days Past Due | Agricultural Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0.6 0.1  
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Real Estate Portfolio Segment [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 4.0 0.6  
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 0.1 0.3  
Financing Receivables, Equal to Greater than 90 Days Past Due | Residential Real Estate Construction Financing Receivable [Member]      
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 Real Estate Construction [Member]      
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 | Real Estate Construction Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0.1 0.3  
Financing Receivables, Equal to Greater than 90 Days Past Due | Residential Mortgage [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 0.5 1.1  
Financing Receivables, Equal to Greater than 90 Days Past Due | Agricultural Real Estate Financing Receivable [Member]      
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 | Real Estate Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 4.6 2.0  
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 0.5  
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 0.2 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 0.6 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 1.3 1.4  
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Portfolio Segment [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due 1.2 2.3  
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 8.5 5.7  
Financing Receivables, Equal to Greater than 90 Days Past Due | Agricultural Financing Receivable [Member]      
Loans and Leases Receivable Recorded Investment, Past Due      
Total Loans 30 or More Days Past Due $ 1.4 $ 0.0