v3.26.1
Borrowings - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2026
Dec. 31, 2025
Feb. 28, 2026
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]        
Borrowings from federal reserve bank   $ 0    
Federal home loan bank, advances, general debt obligations, amount of available, unused funds   228,500,000 $ 145,700,000  
Federal reserve bank advances, eligible borrowing capacity   930,100,000    
Securities [Member]        
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]        
Federal home loan bank, advances, general debt obligations, disclosures, collateral pledged   0 0  
Federal reserve bank, general debt obligations, disclosures, collateral pledged   348,400,000 351,800,000  
Loans [Member]        
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]        
Federal reserve bank, general debt obligations, disclosures, collateral pledged   774,600,000 773,700,000  
Agricultural and Residential Real Estate [Member]        
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]        
Federal home loan bank, advances, general debt obligations, disclosures, collateral pledged   614,700,000 610,900,000  
Line of Credit [Member]        
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]        
Line of credit facility, maximum borrowing capacity $ 20,000,000     $ 25,000,000
Long-term line of credit   $ 0 $ 0  
Line of Credit [Member] | Minimum [Member]        
Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items]        
Debt instrument, basis spread on variable rate 3.25% 6.75% 6.75%  
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:PrimeRateMember us-gaap:PrimeRateMember us-gaap:PrimeRateMember