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Loans Held for Investment - Schedule of Modifications to Borrowers (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period $ 31.2 $ 24.8      
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 0.21% 0.14%      
Interest Receivable $ 101.3   $ 101.3   $ 102.6
Financing Receivable, Modified in Period, Accrued Interest, Amount 0.1 $ 0.1      
Accruing          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period     3.6 $ 0.5  
Nonaccrual 30 or more DPD          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period     23.9 $ 30.3  
Extended Maturity [Member]          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period 30.8 21.9      
Extended Maturity and Interest Rate Reduction          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period 0.4 2.9      
Agricultural          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period $ 11.4        
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 1.84%        
Financing Receivable, Loan in Process $ 5.0   5.0   0.2
Financing Receivable, Modified, Weighted-Average Term Increase from Modification 11 years 8 months 12 days        
Agricultural | Extended Maturity [Member]          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period $ 11.4        
Agricultural | Extended Maturity and Interest Rate Reduction          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period $ 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        
Agricultural | Weighted-Average Interest Rate Reduction          
Financing Receivable, Modifications to Borrowers [Line Items]          
Combination Term Extension and Interest Rate Reduction Percent 0.00%        
Agricultural          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period $ 8.1 $ 2.9      
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 1.90% 0.49%      
Financing Receivable, Loan in Process $ 4.5   4.5   1.1
Financing Receivable, Modified, Weighted-Average Term Increase from Modification 6 years 2 months 12 days 7 years 6 months      
Agricultural | Extended Maturity [Member]          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period $ 8.1 $ 1.0      
Agricultural | Extended Maturity and Interest Rate Reduction          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.0 $ 1.9      
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 7 years 4 months 24 days      
Agricultural | Weighted-Average Interest Rate Reduction          
Financing Receivable, Modifications to Borrowers [Line Items]          
Combination Term Extension and Interest Rate Reduction Percent 0.00% 1.00%      
Other, including overdrafts          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Loan in Process $ 0.0   0.0   0.0
Commercial          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period $ 1.5 $ 9.3      
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 0.02% 0.10%      
Financing Receivable, Loan in Process $ 37.8   37.8   40.1
Financing Receivable, Modified, Weighted-Average Term Increase from Modification 12 years 7 months 6 days 8 years 9 months 18 days      
Commercial | Extended Maturity [Member]          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period $ 1.3 $ 8.5      
Commercial | Extended Maturity and Interest Rate Reduction          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.2 $ 0.8      
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 120 years 13 years 3 months 18 days      
Commercial | Weighted-Average Interest Rate Reduction          
Financing Receivable, Modifications to Borrowers [Line Items]          
Combination Term Extension and Interest Rate Reduction Percent 1.70% 0.85%      
Total construction loans          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period $ 1.7 $ 11.6      
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 0.25% 1.06%      
Financing Receivable, Loan in Process $ 0.9   0.9   13.5
Financing Receivable, Modified, Weighted-Average Term Increase from Modification 8 years 1 month 6 days 5 years 9 months 18 days      
Total construction loans | Extended Maturity [Member]          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period $ 1.7 $ 11.6      
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 $ 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   $ 0.2      
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent   0.01%      
Financing Receivable, Loan in Process $ 9.1   9.1   10.9
Financing Receivable, Modified, Weighted-Average Term Increase from Modification   4 years      
Residential | Extended Maturity [Member]          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period   $ 0.1      
Residential | Extended Maturity and Interest Rate Reduction          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period   $ 0.1      
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   94 years      
Residential | Weighted-Average Interest Rate Reduction          
Financing Receivable, Modifications to Borrowers [Line Items]          
Combination Term Extension and Interest Rate Reduction Percent   2.00%      
Total real estate          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period $ 14.6 $ 21.1      
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 0.13% 0.16%      
Financing Receivable, Loan in Process $ 52.8   52.8   64.7
Total real estate | Extended Maturity [Member]          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period 14.4 $ 20.2      
Total real estate | Extended Maturity and Interest Rate Reduction          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period 0.2 0.9      
Commercial          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period $ 8.4 $ 0.8      
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 0.36% 0.03%      
Financing Receivable, Loan in Process $ 8.6   8.6   8.9
Financing Receivable, Modified, Weighted-Average Term Increase from Modification 12 years 9 months 18 days 8 years 7 months 6 days      
Commercial | Extended Maturity [Member]          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period $ 8.2 $ 0.7      
Commercial | Extended Maturity and Interest Rate Reduction          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.2 $ 0.1      
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 3 years 5 years      
Commercial | Weighted-Average Interest Rate Reduction          
Financing Receivable, Modifications to Borrowers [Line Items]          
Combination Term Extension and Interest Rate Reduction Percent 0.80% 0.50%      
Indirect consumer          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Loan in Process $ 6.3   6.3   8.3
Total consumer loans          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.1        
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent        
Financing Receivable, Loan in Process $ 7.1   7.1   9.4
Total consumer loans | Extended Maturity [Member]          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period 0.1        
Total consumer loans | Extended Maturity and Interest Rate Reduction          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period 0.0        
Consumer Loan          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.1        
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 0.08%        
Financing Receivable, Loan in Process $ 0.8   $ 0.8   $ 1.1
Financing Receivable, Modified, Weighted-Average Term Increase from Modification 38 years 1 month 6 days        
Consumer Loan | Extended Maturity [Member]          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.1        
Consumer Loan | Extended Maturity and Interest Rate Reduction          
Financing Receivable, Modifications to Borrowers [Line Items]          
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.0        
Consumer Loan | 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        
Consumer Loan | Weighted-Average Interest Rate Reduction          
Financing Receivable, Modifications to Borrowers [Line Items]          
Combination Term Extension and Interest Rate Reduction Percent 0.00%