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Loans Held for Investment - Schedule of Modifications to Borrowers (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Loans and Leases Receivable, Troubled Debt Restructuring    
Accrued interest receivable $ 116.8 $ 129.1
Financing Receivable, Modified in Period, Accrued Interest, Amount 0.2 1.6
Commercial Real Estate Portfolio Segment [Member]    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 26.4 $ 31.8
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.28% 0.36%
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 26.4 $ 31.8
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.28% 0.36%
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification 0.00% 0.35%
Financing Receivable, Modified, Weighted Average Term Increase from Modification 8 years 7 months 6 days 5 years 9 months 18 days
Commercial Real Estate Portfolio Segment [Member] | Extension of terms or maturity    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 26.4 $ 28.6
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 26.4 28.6
Commercial Real Estate Portfolio Segment [Member] | Extended Maturity and Interest Rate Reduction    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.6
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.6
Commercial Real Estate Portfolio Segment [Member] | Interest rate adjustment    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 1.1
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 1.1
Commercial Real Estate Portfolio Segment [Member] | Principal Forgiveness    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 1.5
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 1.5
Commercial Real Estate Portfolio Segment [Member] | Weighted-Average Months of Term Extension    
Loans and Leases Receivable, Troubled Debt Restructuring    
Combination Term Extension and Interest Rate Reduction 0 years 6 years
Commercial Real Estate Portfolio Segment [Member] | Principal Forgiven    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 1.3
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 1.3
Commercial Real Estate Portfolio Segment [Member] | Weighted-Average Interest Rate Reduction    
Loans and Leases Receivable, Troubled Debt Restructuring    
Combination Term Extension and Interest Rate Reduction Percent 0.00% 0.25%
Real Estate Construction Financing Receivable [Member]    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 1.9 $ 13.7
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.15% 0.75%
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 1.9 $ 13.7
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.15% 0.75%
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification 0.00% 0.00%
Financing Receivable, Modified, Weighted Average Term Increase from Modification 4 years 9 years 1 month 6 days
Real Estate Construction Financing Receivable [Member] | Extension of terms or maturity    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 1.9 $ 13.7
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 1.9 13.7
Real Estate Construction Financing Receivable [Member] | Extended Maturity and Interest Rate Reduction    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Real Estate Construction Financing Receivable [Member] | Interest rate adjustment    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Real Estate Construction Financing Receivable [Member] | Principal Forgiveness    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 0.0
Real Estate Construction Financing Receivable [Member] | Weighted-Average Months of Term Extension    
Loans and Leases Receivable, Troubled Debt Restructuring    
Combination Term Extension and Interest Rate Reduction 0 years 0 years
Real Estate Construction Financing Receivable [Member] | Principal Forgiven    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 0.0
Real Estate Construction Financing Receivable [Member] | Weighted-Average Interest Rate Reduction    
Loans and Leases Receivable, Troubled Debt Restructuring    
Combination Term Extension and Interest Rate Reduction Percent 0.00% 0.00%
Residential Real Estate    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.3 $ 0.7
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.01% 0.03%
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.3 $ 0.7
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.01% 0.03%
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification 0.00% 0.00%
Financing Receivable, Modified, Weighted Average Term Increase from Modification 0 years 131 years 7 months 6 days
Residential Real Estate | Extension of terms or maturity    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 0.6
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.6
Residential Real Estate | Extended Maturity and Interest Rate Reduction    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.3 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.3 0.0
Residential Real Estate | Interest rate adjustment    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Residential Real Estate | Principal Forgiveness    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.1
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 0.1
Residential Real Estate | Weighted-Average Months of Term Extension    
Loans and Leases Receivable, Troubled Debt Restructuring    
Combination Term Extension and Interest Rate Reduction 31 years 2 months 12 days 0 years
Residential Real Estate | Principal Forgiven    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 0.3
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 0.3
Residential Real Estate | Weighted-Average Interest Rate Reduction    
Loans and Leases Receivable, Troubled Debt Restructuring    
Combination Term Extension and Interest Rate Reduction Percent 3.43% 0.00%
Agricultural Real Estate Financing Receivable [Member]    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 12.0 $ 6.4
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 1.71% 0.89%
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 12.0 $ 6.4
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 1.71% 0.89%
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification 0.00% 0.00%
Financing Receivable, Modified, Weighted Average Term Increase from Modification 10 years 4 months 24 days 4 years 6 months
Agricultural Real Estate Financing Receivable [Member] | Extension of terms or maturity    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 12.0 $ 6.4
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 12.0 6.4
Agricultural Real Estate Financing Receivable [Member] | Extended Maturity and Interest Rate Reduction    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Agricultural Real Estate Financing Receivable [Member] | Interest rate adjustment    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Agricultural Real Estate Financing Receivable [Member] | Principal Forgiveness    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 0.0
Agricultural Real Estate Financing Receivable [Member] | Weighted-Average Months of Term Extension    
Loans and Leases Receivable, Troubled Debt Restructuring    
Combination Term Extension and Interest Rate Reduction 0 years 0 years
Agricultural Real Estate Financing Receivable [Member] | Principal Forgiven    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 0.0
Agricultural Real Estate Financing Receivable [Member] | Weighted-Average Interest Rate Reduction    
Loans and Leases Receivable, Troubled Debt Restructuring    
Combination Term Extension and Interest Rate Reduction Percent 0.00% 0.00%
Real Estate Financing Receivable [Member]    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 40.6 $ 52.6
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.30% 0.39%
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 40.6 $ 52.6
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.30% 0.39%
Real Estate Financing Receivable [Member] | Extension of terms or maturity    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 40.3 $ 49.3
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 40.3 49.3
Real Estate Financing Receivable [Member] | Extended Maturity and Interest Rate Reduction    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.3 0.6
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.3 0.6
Real Estate Financing Receivable [Member] | Interest rate adjustment    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 1.1
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 1.1
Real Estate Financing Receivable [Member] | Principal Forgiveness    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 1.6
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 1.6
Real Estate Financing Receivable [Member] | Principal Forgiven    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 1.6
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 1.6
Indirect consumer    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.1 $ 0.1
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.01% 0.01%
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.1 $ 0.1
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.01% 0.01%
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification 0.00% 0.00%
Financing Receivable, Modified, Weighted Average Term Increase from Modification 7 years 8 years 3 months 18 days
Indirect consumer | Extension of terms or maturity    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.1 $ 0.1
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.1 0.1
Indirect consumer | Extended Maturity and Interest Rate Reduction    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Indirect consumer | Interest rate adjustment    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Indirect consumer | Principal Forgiveness    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 0.0
Indirect consumer | Weighted-Average Months of Term Extension    
Loans and Leases Receivable, Troubled Debt Restructuring    
Combination Term Extension and Interest Rate Reduction 0 years 0 years
Indirect consumer | Principal Forgiven    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 0.0
Indirect consumer | Weighted-Average Interest Rate Reduction    
Loans and Leases Receivable, Troubled Debt Restructuring    
Combination Term Extension and Interest Rate Reduction Percent 0.00% 0.00%
Other consumer    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount   $ 0.1
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage   0.07%
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount   $ 0.1
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage   0.07%
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification   0.00%
Financing Receivable, Modified, Weighted Average Term Increase from Modification   62 years 1 month 6 days
Other consumer | Extension of terms or maturity    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount   $ 0.1
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount   0.1
Other consumer | Extended Maturity and Interest Rate Reduction    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount   0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount   0.0
Other consumer | Interest rate adjustment    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount   0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount   0.0
Other consumer | Principal Forgiveness    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount   0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount   $ 0.0
Other consumer | Weighted-Average Months of Term Extension    
Loans and Leases Receivable, Troubled Debt Restructuring    
Combination Term Extension and Interest Rate Reduction   0 years
Other consumer | Principal Forgiven    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount   $ 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount   $ 0.0
Other consumer | Weighted-Average Interest Rate Reduction    
Loans and Leases Receivable, Troubled Debt Restructuring    
Combination Term Extension and Interest Rate Reduction Percent   0.00%
Total consumer loans    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.1 $ 0.2
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.01% 0.02%
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.1 $ 0.2
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.01% 0.02%
Total consumer loans | Extension of terms or maturity    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.1 $ 0.2
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.1 0.2
Total consumer loans | Extended Maturity and Interest Rate Reduction    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Total consumer loans | Interest rate adjustment    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Total consumer loans | Principal Forgiveness    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Total consumer loans | Principal Forgiven    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Commercial Portfolio Segment [Member]    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 9.5 $ 7.6
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.34% 0.26%
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 9.5 $ 7.6
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.34% 0.26%
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification 0.00% 0.00%
Financing Receivable, Modified, Weighted Average Term Increase from Modification 20 years 2 months 12 days 12 years 2 months 12 days
Commercial Portfolio Segment [Member] | Extension of terms or maturity    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 8.9 $ 7.4
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 8.9 7.4
Commercial Portfolio Segment [Member] | Extended Maturity and Interest Rate Reduction    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.6 0.2
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.6 0.2
Commercial Portfolio Segment [Member] | Interest rate adjustment    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Commercial Portfolio Segment [Member] | Principal Forgiveness    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 0.0
Commercial Portfolio Segment [Member] | Weighted-Average Months of Term Extension    
Loans and Leases Receivable, Troubled Debt Restructuring    
Combination Term Extension and Interest Rate Reduction 10 years 14 years 7 months 6 days
Commercial Portfolio Segment [Member] | Principal Forgiven    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 0.0
Commercial Portfolio Segment [Member] | Weighted-Average Interest Rate Reduction    
Loans and Leases Receivable, Troubled Debt Restructuring    
Combination Term Extension and Interest Rate Reduction Percent 0.98% 0.51%
Agricultural Financing Receivable [Member]    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 20.1 $ 36.1
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 2.92% 4.69%
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 20.1 $ 36.1
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 2.92% 4.69%
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification 0.00% 0.00%
Financing Receivable, Modified, Weighted Average Term Increase from Modification 9 years 4 months 24 days 9 years 2 months 12 days
Agricultural Financing Receivable [Member] | Extension of terms or maturity    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 20.1 $ 36.1
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 20.1 36.1
Agricultural Financing Receivable [Member] | Extended Maturity and Interest Rate Reduction    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Agricultural Financing Receivable [Member] | Interest rate adjustment    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Agricultural Financing Receivable [Member] | Principal Forgiveness    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 0.0
Agricultural Financing Receivable [Member] | Weighted-Average Months of Term Extension    
Loans and Leases Receivable, Troubled Debt Restructuring    
Combination Term Extension and Interest Rate Reduction 0 years 0 years
Agricultural Financing Receivable [Member] | Principal Forgiven    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 0.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 0.0
Agricultural Financing Receivable [Member] | Weighted-Average Interest Rate Reduction    
Loans and Leases Receivable, Troubled Debt Restructuring    
Combination Term Extension and Interest Rate Reduction Percent 0.00% 0.00%
Loans held for investment    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 70.3 $ 96.5
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.39% 0.53%
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 70.3 $ 96.5
Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage 0.39% 0.53%
Loans held for investment | Extension of terms or maturity    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 69.4 $ 93.0
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 69.4 93.0
Loans held for investment | Extended Maturity and Interest Rate Reduction    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.9 0.8
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.9 0.8
Loans held for investment | Interest rate adjustment    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 1.1
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 1.1
Loans held for investment | Principal Forgiveness    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 1.6
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 1.6
Loans held for investment | Principal Forgiven    
Receivables [Abstract]    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount 0.0 1.6
Loans and Leases Receivable, Troubled Debt Restructuring    
Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount $ 0.0 $ 1.6