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Loans Held for Investment - Composition of Net Loans Held for Investment by Class (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, Total $ 370,808   $ 356,975      
Less:            
Allowance for loan losses (2,583) $ (2,547) (2,458) $ (2,551) $ (2,677) $ (2,707)
Deferred loan (fees) costs, net (231)   (104)      
Net loans held for investment 367,994   354,413      
Commercial [Member]            
Less:            
Allowance for loan losses (1,460) (1,461) (1,401) (1,323) (1,439) (1,404)
Commercial [Member] | Commercial Loan [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, Total 55,837   54,912      
Commercial [Member] | Real Estate - Commercial [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, Total 134,120   114,712      
Commercial [Member] | Other Real Estate Construction [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, Total 32,457   40,186      
Non-Commercial [Member]            
Less:            
Allowance for loan losses (1,123) $ (1,086) (1,057) $ (1,228) $ (1,238) $ (1,303)
Non-Commercial [Member] | Consumer Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, Total 11,686   10,774      
Non-Commercial [Member] | Real Estate 1 - 4 Family Construction [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, Total 5,037   5,024      
Non-Commercial [Member] | Real Estate - Residential [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, Total 78,604   78,023      
Non-Commercial [Member] | Home Equity [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, Total 50,188   50,506      
Non-Commercial [Member] | Other Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans, Total $ 2,879   $ 2,838