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Loans - Loans (Detail) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Loans:        
Loans - Gross $ 1,462,920,000 $ 1,305,473,000    
Less: Net deferred loan fees and costs (4,497,000) (2,483,000)    
Loans after net deferred loan fees and costs 1,458,423,000 1,302,990,000 $ 1,344,723,000  
Less: Allowance for loan losses (15,087,000) (13,672,000)   $ (7,228,000)
Loans - Net 1,443,336,000 1,289,318,000    
Consumer Real Estate [Member]        
Loans:        
Loans - Gross 194,715,000 175,588,000    
Loans after net deferred loan fees and costs 194,574,000 175,316,000 173,615,000  
Agricultural Real Estate [Member]        
Loans:        
Loans - Gross 189,742,000 189,159,000    
Loans after net deferred loan fees and costs 189,426,000 188,826,000 194,310,000  
Agricultural [Member]        
Loans:        
Loans - Gross 100,756,000 94,358,000    
Loans after net deferred loan fees and costs 100,905,000 94,490,000 107,615,000  
Commercial Real Estate [Member]        
Loans:        
Loans - Gross 691,122,000 588,825,000    
Loans after net deferred loan fees and costs 689,728,000 587,654,000 588,176,000  
Commercial and Industrial [Member]        
Loans:        
Loans - Gross 216,609,000 189,246,000    
Loans after net deferred loan fees and costs 213,707,000 188,286,000    
Less: Allowance for loan losses 0      
Consumer [Member]        
Loans:        
Loans - Gross 56,427,000 52,540,000    
Loans after net deferred loan fees and costs 56,534,000 52,661,000 $ 50,259,000  
Other Loan [Member]        
Loans:        
Loans - Gross 13,549,000 15,757,000    
Loans after net deferred loan fees and costs $ 13,549,000 $ 15,757,000