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Allowance for Loan Losses - Summary of Performing and Nonperforming Loans by Class (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable Recorded Investment [Line Items]    
Loans $ 341,829 $ 320,132
Real Estate - Commercial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 109,752 101,198
Other Real Estate Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 26,718 17,692
Real Estate 1 - 4 Family Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 5,625 5,629
Real Estate - Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 81,769 83,419
Home Equity [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 50,815 49,420
Other Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 1,687 1,481
Commercial Loan [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 55,752 52,311
Consumer Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 9,711 8,982
Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 340,379 319,349
Performing [Member] | Real Estate - Commercial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 109,360 101,198
Performing [Member] | Other Real Estate Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 26,528 17,497
Performing [Member] | Real Estate 1 - 4 Family Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 5,625 5,629
Performing [Member] | Real Estate - Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 80,923 82,878
Performing [Member] | Home Equity [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 50,793 49,407
Performing [Member] | Other Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 1,687 1,481
Performing [Member] | Commercial Loan [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 55,752 52,277
Performing [Member] | Consumer Loans [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 9,711 8,982
Non-Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 1,450 783
Non-Performing [Member] | Real Estate - Commercial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 392  
Non-Performing [Member] | Other Real Estate Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 190 195
Non-Performing [Member] | Real Estate - Residential [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans 846 541
Non-Performing [Member] | Home Equity [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans $ 22 13
Non-Performing [Member] | Commercial Loan [Member]    
Financing Receivable Recorded Investment [Line Items]    
Loans   $ 34