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Loans Held for Investment - Schedule of Modifications to Borrowers (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period $ 40.6 $ 27.2  
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 0.22% 0.15%  
Interest Receivable $ 125.5   $ 129.1
Financing Receivable, Loan in Process 19.1    
Financing Receivable, Modified in Period, Accrued Interest, Amount 0.2 $ 0.3  
Principal Forgiveness      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period 0.0 1.7  
Extended Maturity [Member]      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period 34.7 25.5  
Extended Maturity and Interest Rate Reduction      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period 5.9 0.0  
Principal Forgiven      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period 0.0 1.6  
Agricultural      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period $ 6.1 $ 1.2  
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 0.85% 0.16%  
Financing Receivable, Loan in Process $ 5.7   1.8
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 7 years 2 months 12 days  
Agricultural | Principal Forgiveness      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.0 $ 0.0  
Agricultural | Extended Maturity [Member]      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period 6.1 1.2  
Agricultural | Extended Maturity and Interest Rate Reduction      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period 0.0 0.0  
Agricultural | Principal Forgiven      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.0 $ 0.0  
Agricultural | Weighted-Average Months of Term Extension      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension, Weighted-Average Months 0 years 0 years  
Agricultural | Weighted-Average Interest Rate Reduction      
Financing Receivable, Modifications to Borrowers [Line Items]      
Combination Term Extension and Interest Rate Reduction Percent 0.00% 0.00%  
Agricultural      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period $ 1.0 $ 17.8  
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 0.14% 2.70%  
Financing Receivable, Loan in Process $ 19.2   3.1
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification 0.00% 0.00%  
Financing Receivable, Modified, Weighted Average Term Increase from Modification 3 years 3 months 18 days 9 years 3 months 18 days  
Agricultural | Principal Forgiveness      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.0 $ 0.0  
Agricultural | Extended Maturity [Member]      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period 1.0 17.8  
Agricultural | Extended Maturity and Interest Rate Reduction      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period 0.0 0.0  
Agricultural | Principal Forgiven      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.0 $ 0.0  
Agricultural | Weighted-Average Months of Term Extension      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension, Weighted-Average Months 0 years 0 years  
Agricultural | Weighted-Average Interest Rate Reduction      
Financing Receivable, Modifications to Borrowers [Line Items]      
Combination Term Extension and Interest Rate Reduction Percent 0.00% 0.00%  
Other, including overdrafts      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Loan in Process $ 0.0   0.0
Commercial      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period $ 22.7 $ 5.3  
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 0.25% 0.06%  
Financing Receivable, Loan in Process $ 1.7   18.8
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification 0.00% 0.00%  
Financing Receivable, Modified, Weighted Average Term Increase from Modification 6 years 6 years 1 month 6 days  
Commercial | Principal Forgiveness      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.0 $ 1.6  
Commercial | Extended Maturity [Member]      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period 22.7 3.7  
Commercial | Extended Maturity and Interest Rate Reduction      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period 0.0 0.0  
Commercial | Principal Forgiven      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.0 $ 1.3  
Commercial | Weighted-Average Months of Term Extension      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension, Weighted-Average Months 0 years 0 years  
Commercial | Weighted-Average Interest Rate Reduction      
Financing Receivable, Modifications to Borrowers [Line Items]      
Combination Term Extension and Interest Rate Reduction Percent 0.00% 0.00%  
Total construction loans      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period   $ 0.2  
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent   0.01%  
Financing Receivable, Loan in Process $ 2.2   3.5
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 12 years 4 months 24 days  
Total construction loans | Principal Forgiveness      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period   $ 0.0  
Total construction loans | Extended Maturity [Member]      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period   0.2  
Total construction loans | Extended Maturity and Interest Rate Reduction      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period   0.0  
Total construction loans | Principal Forgiven      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.0 $ 0.0  
Total construction loans | Weighted-Average Months of Term Extension      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension, Weighted-Average Months 0 years 0 years  
Total construction loans | Weighted-Average Interest Rate Reduction      
Financing Receivable, Modifications to Borrowers [Line Items]      
Combination Term Extension and Interest Rate Reduction Percent 0.00% 0.00%  
Residential      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.1 $ 0.1  
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 0.00% 0.00%  
Financing Receivable, Loan in Process $ 14.4   15.6
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification 0.00% 0.00%  
Financing Receivable, Modified, Weighted Average Term Increase from Modification 11 years 37 years 7 months 6 days  
Residential | Principal Forgiveness      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.0 $ 0.1  
Residential | Extended Maturity [Member]      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period 0.1 0.0  
Residential | Extended Maturity and Interest Rate Reduction      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period 0.0 0.0  
Residential | Principal Forgiven      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.0 $ 0.3  
Residential | Weighted-Average Months of Term Extension      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension, Weighted-Average Months 0 years 0 years  
Residential | Weighted-Average Interest Rate Reduction      
Financing Receivable, Modifications to Borrowers [Line Items]      
Combination Term Extension and Interest Rate Reduction Percent 0.00% 0.00%  
Total real estate      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period $ 28.9 $ 6.8  
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 0.21% 0.05%  
Financing Receivable, Loan in Process $ 24.0   39.7
Total real estate | Principal Forgiveness      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period 0.0 $ 1.7  
Total real estate | Extended Maturity [Member]      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period 28.9 5.1  
Total real estate | Extended Maturity and Interest Rate Reduction      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period 0.0 0.0  
Total real estate | Principal Forgiven      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period 0.0 1.6  
Commercial      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period $ 10.7 $ 2.6  
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 0.37% 0.09%  
Financing Receivable, Loan in Process $ 11.6   15.9
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 months 12 days 10 years 10 months 24 days  
Commercial | Principal Forgiveness      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.0 $ 0.0  
Commercial | Extended Maturity [Member]      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period 4.8 2.6  
Commercial | Extended Maturity and Interest Rate Reduction      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period 5.9 0.0  
Commercial | Principal Forgiven      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.0 $ 0.0  
Commercial | Weighted-Average Months of Term Extension      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Excluding Accrued Interest, Modified Period, Term Extension, Weighted-Average Months 5 years 0 years  
Commercial | Weighted-Average Interest Rate Reduction      
Financing Receivable, Modifications to Borrowers [Line Items]      
Combination Term Extension and Interest Rate Reduction Percent 1.00% 0.00%  
Indirect consumer      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Loan in Process $ 8.3   10.6
Direct and advance lines      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Loan in Process 1.3   1.1
Credit Card Receivable [Member]      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Loan in Process 1.4   1.8
Total consumer loans      
Financing Receivable, Modifications to Borrowers [Line Items]      
Financing Receivable, Loan in Process $ 11.0   $ 13.5