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Loans - Composition of Net Loans (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Gross Loans $ 430,268,000 $ 391,495,000    
Unearned income (686,000) (535,000)    
Allowance for loan losses (6,473,703) (6,542,326) $ (8,077,757) $ (6,954,269)
Loans, net 423,108,391 384,417,508    
Commercial Real Estate Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real estate loans 341,163,000 325,612,000    
Total Gross Loans 341,163,000 325,612,000    
Allowance for loan losses (5,238,895) (5,202,151) (4,706,011) (4,629,559)
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real estate loans 33,133,000 43,233,000    
Total Gross Loans 33,133,000 43,233,000    
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real estate loans 23,293,000 26,463,000    
Total Gross Loans 23,293,000 26,463,000    
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real estate loans 104,046,000 104,170,000    
Total Gross Loans 104,046,000 104,170,000    
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Real estate loans 180,691,000 151,746,000    
Total Gross Loans 180,691,000 151,746,000    
Real Estate Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Business loans 62,480,000 39,368,000    
Total Gross Loans 62,480,000 39,368,000    
Allowance for loan losses (643,248) (873,815) (2,767,409) (1,554,698)
Real Estate Loans [Member] | Commercial and Industrial Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Business loans 61,425,000 38,333,000    
Total Gross Loans 61,425,000 38,333,000    
Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Business loans 1,055,000 1,035,000    
Total Gross Loans 1,055,000 1,035,000    
Consumer Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer loans 26,625,000 26,515,000    
Total Gross Loans 26,625,000 26,515,000    
Allowance for loan losses (591,560) (466,360) $ (604,337) $ (770,012)
Consumer Portfolio Segment [Member] | Credit Card Receivable        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer loans 1,061,000 1,075,000    
Total Gross Loans 1,061,000 1,075,000    
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Consumer loans 25,564,000 25,440,000    
Total Gross Loans $ 25,564,000 $ 25,440,000