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Loans - Composition of Net Loans (Detail) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Gross Loans $ 420,722,000 $ 405,605,000    
Unearned Income (105,000) (195,000)    
Allowance for Loan Losses (3,027,950) (3,019,228) $ (3,506,006) $ (3,902,796)
Loans, net 417,589,558 402,390,574    
Commercial Real Estate Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 338,591,000 330,489,000    
Total Gross Loans 338,591,000 330,489,000    
Allowance for Loan Losses (2,616,899) (2,151,715) (2,747,926) (3,117,134)
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 37,360,000 25,923,000    
Total Gross Loans 37,360,000 25,923,000    
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 15,889,000 16,905,000    
Total Gross Loans 15,889,000 16,905,000    
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 88,627,000 95,925,000    
Total Gross Loans 88,627,000 95,925,000    
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 196,715,000 191,736,000    
Total Gross Loans 196,715,000 191,736,000    
Real Estate Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Business loans 67,381,000 59,126,000    
Total Gross Loans 67,381,000 59,126,000    
Allowance for Loan Losses (118,028) (346,781) (283,048) (257,554)
Real Estate Loans [Member] | Commercial and Industrial Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Business loans 66,382,000 58,204,000    
Total Gross Loans 66,382,000 58,204,000    
Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Business loans 999,000 922,000    
Total Gross Loans 999,000 922,000    
Consumer Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 14,750,000 15,990,000    
Total Gross Loans 14,750,000 15,990,000    
Allowance for Loan Losses (293,023) (520,732) $ (475,032) $ (528,108)
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 1,342,000 1,310,000    
Total Gross Loans 1,342,000 1,310,000    
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans 13,408,000 14,680,000    
Total Gross Loans $ 13,408,000 $ 14,680,000