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Loans Held for Investment - Schedule of Modifications to Borrowers (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period $ 27.1 $ 31.2 $ 52.3 $ 50.6      
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 0.19% 0.19% 0.37% 0.31%      
Interest Receivable $ 97.3   $ 97.3   $ 97.3   $ 102.6
Financing Receivable, Modified in Period, Accrued Interest, Amount     0.4 $ 0.3      
Accruing              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period         3.4 $ 0.0  
Nonaccrual 30 or more DPD              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period         26.7 $ 4.2  
Extended Maturity [Member]              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period 26.9 $ 31.1 51.9 48.1      
Extended Maturity and Interest Rate Reduction              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period 0.2 0.1 0.4 2.5      
Agricultural              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period $ 1.3 $ 5.1 $ 12.2 $ 5.2      
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 0.22% 0.80% 2.06% 0.82%      
Financing Receivable, Loan in Process $ 0.3   $ 0.3   0.3   0.2
Financing Receivable, Modified, Weighted-Average Term Increase from Modification 9 years 6 years 11 years 6 months 6 years      
Agricultural | Extended Maturity [Member]              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period $ 1.3 $ 5.1 $ 12.2 $ 5.2      
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 $ 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 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% 0.00% 0.00%      
Agricultural              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period $ 16.0 $ 8.9 $ 19.7 $ 12.1      
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 4.48% 1.64% 5.51% 2.23%      
Financing Receivable, Loan in Process $ 2.5   $ 2.5   2.5   1.1
Financing Receivable, Modified, Weighted-Average Term Increase from Modification 6 years 6 months 5 years 10 months 24 days 6 years 9 months 18 days 6 years 6 months      
Agricultural | Extended Maturity [Member]              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period $ 16.0 $ 8.9 $ 19.7 $ 10.7      
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 $ 0.0 $ 1.4      
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 0 years 7 years 3 months 18 days      
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% 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   0.0
Commercial              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period $ 3.5 $ 13.2 $ 5.0 $ 15.0      
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 0.04% 0.15% 0.06% 0.17%      
Financing Receivable, Loan in Process $ 5.9   $ 5.9   5.9   40.1
Financing Receivable, Modified, Weighted-Average Term Increase from Modification 100 years 2 months 12 days 14 years 4 months 24 days 76 years 3 months 18 days 13 years 6 months      
Commercial | Extended Maturity [Member]              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period $ 3.5 $ 13.2 $ 4.8 $ 14.2      
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 $ 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 0 years 0 years 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 0.00% 0.00% 1.70% 0.85%      
Total construction loans              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.3   $ 2.0 $ 11.5      
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 0.05%   0.35% 1.14%      
Financing Receivable, Loan in Process $ 0.7   $ 0.7   0.7   13.5
Financing Receivable, Modified, Weighted-Average Term Increase from Modification 31 years 3 months 18 days   13 years 7 months 6 days 6 years 4 months 24 days      
Total construction loans | Extended Maturity [Member]              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period $ 0.3   $ 2.0 $ 11.5      
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 $ 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 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% 0.00%      
Residential              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period       $ 0.5      
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent       0.02%      
Financing Receivable, Loan in Process $ 3.2   $ 3.2   3.2   10.9
Financing Receivable, Modified, Weighted-Average Term Increase from Modification       22 years 3 months 18 days      
Residential | Extended Maturity [Member]              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period       $ 0.3      
Residential | Extended Maturity and Interest Rate Reduction              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period       $ 0.2      
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       84 years 9 months 18 days      
Residential | Weighted-Average Interest Rate Reduction              
Financing Receivable, Modifications to Borrowers [Line Items]              
Combination Term Extension and Interest Rate Reduction Percent       2.20%      
Total real estate              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period $ 5.1 $ 18.3 $ 19.2 $ 32.2      
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 0.05% 0.15% 0.17% 0.26%      
Financing Receivable, Loan in Process $ 10.1   $ 10.1   10.1   64.7
Total real estate | Extended Maturity [Member]              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period 5.1 $ 18.3 19.0 $ 31.2      
Total real estate | Extended Maturity and Interest Rate Reduction              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period 0.0 0.0 0.2 1.0      
Commercial              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period $ 6.0 $ 4.0 $ 13.3 $ 6.3      
Financing Receivable, Modification to Total Financing Receivables, Excluding Accrued Interest, Percent 0.26% 0.16% 0.58% 0.25%      
Financing Receivable, Loan in Process $ 6.6   $ 6.6   6.6   8.9
Financing Receivable, Modified, Weighted-Average Term Increase from Modification 18 years 2 months 12 days 8 years 1 month 6 days 15 years 1 month 6 days 9 years 8 months 12 days      
Commercial | Extended Maturity [Member]              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Excluding Accrued Interest, Modified Period $ 5.8 $ 3.9 $ 13.1 $ 6.2      
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 $ 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 9 years 23 years 7 months 6 days 9 years 22 years 4 months 24 days      
Commercial | Weighted-Average Interest Rate Reduction              
Financing Receivable, Modifications to Borrowers [Line Items]              
Combination Term Extension and Interest Rate Reduction Percent 0.80% 0.20% 0.80% 0.50%      
Indirect consumer              
Financing Receivable, Modifications to Borrowers [Line Items]              
Financing Receivable, Loan in Process $ 5.3   $ 5.3   5.3   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 6.4   $ 6.4   6.4   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 $ 1.1   $ 1.1   $ 1.1   $ 1.1
Financing Receivable, Modified, Weighted-Average Term Increase from Modification     45 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%