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Loans - Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Loans:        
Loans - Gross $ 708,337 $ 686,516    
Less: Net deferred loan fees and costs (677) (638)    
Loans after net deferred loan fees and costs 707,660 685,878 $ 614,709  
Less: Allowance for loan losses (6,285) (6,057)   $ (5,905)
Loans - Net 701,375 679,821    
Agricultural Real Estate [Member]        
Loans:        
Loans - Gross 59,533 58,525    
Loans after net deferred loan fees and costs 59,479 58,463 51,396  
Agricultural [Member]        
Loans:        
Loans - Gross 77,909 82,654    
Loans after net deferred loan fees and costs 78,021 82,762 71,571  
Industrial Development Bonds [Member]        
Loans:        
Loans - Gross 6,420 6,491    
Loans after net deferred loan fees and costs 6,420 6,491    
Consumer Real Estate [Member]        
Loans:        
Loans - Gross 88,365 88,189    
Loans after net deferred loan fees and costs 88,097 87,947 97,019  
Commercial Real Estate [Member]        
Loans:        
Loans - Gross 345,223 322,762    
Loans after net deferred loan fees and costs 344,661 322,230 271,201  
Consumer [Member]        
Loans:        
Loans - Gross 27,995 27,770    
Loans after net deferred loan fees and costs 28,016 27,787 $ 23,627  
Commercial and Industrial [Member]        
Loans:        
Loans - Gross 102,892 100,125    
Loans after net deferred loan fees and costs $ 102,966 $ 100,198