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Loans (Impaired Loans) - Additional Information (Detail)
 3 Months Ended
Jul. 30, 2021
Mar. 31, 2024
USD ($)
Contract
Mar. 31, 2023
USD ($)
Contract
Dec. 31, 2023
USD ($)
Jan. 01, 2023
USD ($)
Dec. 31, 2022
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Number of contracts modified | Contract   1        
Term of loan 5 years          
Allowance for loan losses   $ 24,680,000 $ 24,634,000 $ 25,024,000   $ 20,313,000
Modifications to borrower experiencing financial difficulty | Contract   0 0      
Maximum time for re-evaluation (in months)   12 months        
Re-evaluation period for real estate   2 years        
Unsecured consumer loans, credit card credits and overdraft lines of credit reach   90 days        
Delinquent period for charging down consumer loans   90 days        
Litigation and any deficiency charged off period   150 days        
Delinquent period for charging down/allocated commercial and agricultural credits   120 days        
Agricultural Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses   $ 1,171,000 $ 209,000 312,000   349,000
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses   15,953,000 16,088,000 17,400,000   11,924,000
Consumer Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses   3,285,000 3,623,000 3,581,000   $ 998,000
Foreclosed residential real estate property   0   0    
Residential real estate properties foreclosure proceedings   $ 270,000 $ 52,000 $ 679,000    
ASU 2016-13 [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for credit losses and unfunded commitment liability         $ 4,500,000  
Allowance for redit losses and unfunded commitment liability, net of tax         $ 3,400,000