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Loans - Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Loans:        
Loans - Gross $ 831,828 $ 823,771    
Less: Net deferred loan fees and costs (813) (747)    
Loans after net deferred loan fees and costs 831,015 823,024 $ 790,838  
Less: Allowance for loan losses (6,789) (6,868)   $ (6,784)
Loans - Net 824,226 816,156    
Agricultural Real Estate [Member]        
Loans:        
Loans - Gross 69,701 64,073    
Loans after net deferred loan fees and costs 69,676 64,044 64,003  
Agricultural [Member]        
Loans:        
Loans - Gross 104,830 95,111    
Loans after net deferred loan fees and costs 104,980 95,238 83,771  
Industrial Development Bonds [Member]        
Loans:        
Loans - Gross 6,071 6,415    
Loans after net deferred loan fees and costs 6,071 6,415    
Consumer Real Estate [Member]        
Loans:        
Loans - Gross 82,853 83,620    
Loans after net deferred loan fees and costs 82,368 83,200 83,903  
Commercial Real Estate [Member]        
Loans:        
Loans - Gross 411,509 410,520    
Loans after net deferred loan fees and costs 410,886 409,953 394,051  
Consumer [Member]        
Loans:        
Loans - Gross 40,513 37,757    
Loans after net deferred loan fees and costs 40,595 37,802 $ 35,435  
Commercial and Industrial [Member]        
Loans:        
Loans - Gross 116,351 126,275    
Loans after net deferred loan fees and costs $ 116,439 $ 126,372