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Loans - Composition of Net Loans (Detail) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Gross Loans $ 429,322,000 $ 405,605,000    
Unearned Income (45,000) (195,000)    
Allowance for Loan Losses (3,371,695) (3,019,228) $ (3,902,796) $ (6,473,703)
Loans, net 425,905,093 402,390,574    
Commercial Real Estate Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 347,974,000 330,489,000    
Total Gross Loans 347,974,000 330,489,000    
Allowance for Loan Losses (2,844,681) (2,151,715) (3,117,134) (5,238,895)
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 41,134,000 25,923,000    
Total Gross Loans 41,134,000 25,923,000    
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 14,498,000 16,905,000    
Total Gross Loans 14,498,000 16,905,000    
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 88,747,000 95,925,000    
Total Gross Loans 88,747,000 95,925,000    
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 203,595,000 191,736,000    
Total Gross Loans 203,595,000 191,736,000    
Real Estate Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Business loans 67,328,000 59,126,000    
Total Gross Loans 67,328,000 59,126,000    
Allowance for Loan Losses (221,841) (346,781) (257,554) (643,248)
Real Estate Loans [Member] | Commercial and Industrial Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Business loans 66,421,000 58,204,000    
Total Gross Loans 66,421,000 58,204,000    
Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Business loans 907,000 922,000    
Total Gross Loans 907,000 922,000    
Consumer Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Gross Loans 14,020,000 15,990,000    
Allowance for Loan Losses (305,173) (520,732) $ (528,108) $ (591,560)
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Gross Loans 1,648,000 1,310,000    
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Gross Loans $ 12,372,000 $ 14,680,000