v3.25.4
Loans and Allowance for Credit Losses - Schedule of Allowance for Credit Losses on Off-Balance Sheet Credit Exposures (Detail) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]        
Loans, allowance for credit losses $ 52,756 $ 43,267 $ 43,520 $ 45,847
Commercial Real Estate [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans, allowance for credit losses 20,037 14,948 13,476 16,731
Commercial and Industrial [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans, allowance for credit losses 17,830 14,005 17,954 14,951
Residential Real Estate [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans, allowance for credit losses 8,068 8,553 7,784 8,608
Agricultural Real Estate [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans, allowance for credit losses 4,669 3,504 1,718 819
Agricultural [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans, allowance for credit losses 337 439 995 2,457
Consumer [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans, allowance for credit losses 1,815 1,818 1,593 $ 2,281
SEC Schedule, 12-09, Allowance, Credit Loss [Member] | Off Balance Sheet Credit Loss Liability [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans, allowance for credit losses 1,753 1,442 1,625  
SEC Schedule, 12-09, Allowance, Credit Loss [Member] | Commercial Real Estate [Member] | Off Balance Sheet Credit Loss Liability [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans, allowance for credit losses 272 188 285  
SEC Schedule, 12-09, Allowance, Credit Loss [Member] | Commercial and Industrial [Member] | Off Balance Sheet Credit Loss Liability [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans, allowance for credit losses 1,409 1,170 1,053  
SEC Schedule, 12-09, Allowance, Credit Loss [Member] | Residential Real Estate [Member] | Off Balance Sheet Credit Loss Liability [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans, allowance for credit losses 47 69 35  
SEC Schedule, 12-09, Allowance, Credit Loss [Member] | Agricultural Real Estate [Member] | Off Balance Sheet Credit Loss Liability [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans, allowance for credit losses 4 1 2  
SEC Schedule, 12-09, Allowance, Credit Loss [Member] | Agricultural [Member] | Off Balance Sheet Credit Loss Liability [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans, allowance for credit losses 0 12 3  
SEC Schedule, 12-09, Allowance, Credit Loss [Member] | Consumer [Member] | Off Balance Sheet Credit Loss Liability [Member]        
Accounts Notes And Loans Receivable [Line Items]        
Loans, allowance for credit losses $ 21 $ 2 $ 247