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Loans Held for Investment - Composition of Net Loans Held for Investment by Class (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, Total $ 356,975 $ 341,760    
Less:        
Allowance for loan losses (2,458) (2,707) $ (2,884) $ (3,738)
Deferred loan costs, net (104) 69    
Net loans held for investment 354,413 339,122    
Commercial [Member]        
Less:        
Allowance for loan losses (1,401) (1,404) (1,310) (1,716)
Commercial [Member] | Commercial Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, Total 54,912 55,752    
Commercial [Member] | Real Estate - Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, Total 114,712 109,752    
Commercial [Member] | Other Real Estate Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, Total 40,186 26,718    
Non-Commercial [Member]        
Less:        
Allowance for loan losses (1,057) (1,303) $ (1,574) $ (2,022)
Non-Commercial [Member] | Consumer Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, Total 10,774 9,711    
Non-Commercial [Member] | Real Estate 1 - 4 Family Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, Total 5,024 5,625    
Non-Commercial [Member] | Real Estate - Residential [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, Total 78,023 81,700    
Non-Commercial [Member] | Home Equity [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, Total 50,506 50,815    
Non-Commercial [Member] | Other Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans, Total $ 2,838 $ 1,687