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Loans - Loans (Detail) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Loans:    
Loans - Gross $ 2,580,674,000 $ 2,357,903,000
Less: Net deferred loan fees and costs and other 517,000 (1,516,000)
Loans after net deferred loan fees and costs 2,581,191,000 2,356,387,000
Less: Allowance for credit losses (25,024,000) (20,313,000)
Loans - Net 2,556,167,000 2,336,074,000
Consumer Real Estate [Member]    
Loans:    
Loans - Gross 521,895,000 494,423,000
Less: Allowance for credit losses (3,581,000) (998,000)
Agricultural Real Estate [Member]    
Loans:    
Loans - Gross 223,791,000 220,819,000
Less: Allowance for credit losses (312,000) (349,000)
Agricultural [Member]    
Loans:    
Loans - Gross 132,560,000 128,733,000
Less: Allowance for credit losses (336,000) (751,000)
Commercial Real Estate [Member]    
Loans:    
Loans - Gross 1,337,766,000 1,152,603,000
Less: Allowance for credit losses (17,400,000) (11,924,000)
Commercial and Industrial [Member]    
Loans:    
Loans - Gross 254,935,000 242,360,000
Less: Allowance for credit losses 0  
Consumer [Member]    
Loans:    
Loans - Gross 79,591,000 89,147,000
Less: Allowance for credit losses (1,302,000) (909,000)
Other Loan [Member]    
Loans:    
Loans - Gross $ 30,136,000 $ 29,818,000