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Loans Held for Investment - Composition of Net Loans Held for Investment by Class (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, Total $ 341,760 $ 320,092    
Less:        
Allowance for loan losses (2,707) (2,884) $ (3,738) $ (5,095)
Deferred loan costs, net 69 40    
Net loans held for investment 339,122 317,248    
Commercial [Member]        
Less:        
Allowance for loan losses (1,404) (1,310) (1,716) (2,665)
Commercial [Member] | Commercial Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, Total 55,752 52,311    
Commercial [Member] | Real Estate - Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, Total 109,752 101,198    
Commercial [Member] | Other Real Estate Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, Total 26,718 17,692    
Non-Commercial [Member]        
Less:        
Allowance for loan losses (1,303) (1,574) $ (2,022) $ (2,430)
Non-Commercial [Member] | Consumer Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, Total 9,711 8,982    
Non-Commercial [Member] | Real Estate 1 - 4 Family Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, Total 5,625 5,629    
Non-Commercial [Member] | Real Estate - Residential [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, Total 81,700 83,379    
Non-Commercial [Member] | Home Equity [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, Total 50,815 49,420    
Non-Commercial [Member] | Other Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, Total $ 1,687 $ 1,481