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Allowance for Loan Losses - Composition of Nonaccrual Loans by Class (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]    
Increase in non-performing loans $ 2,707 $ 4,250
Commercial Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Increase in non-performing loans 80 42
Real Estate - Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Increase in non-performing loans 74 871
Other Real Estate Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Increase in non-performing loans 305 342
Real Estate - Residential [Member]    
Financing Receivable, Impaired [Line Items]    
Increase in non-performing loans 2,121 2,770
Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Increase in non-performing loans 88 102
Loans 90 Days or More Past Due [Member]    
Financing Receivable, Impaired [Line Items]    
Increase in non-performing loans 783 2,246
Loans 90 Days or More Past Due [Member] | Commercial Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Increase in non-performing loans 34  
Loans 90 Days or More Past Due [Member] | Real Estate - Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Increase in non-performing loans   794
Loans 90 Days or More Past Due [Member] | Other Real Estate Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Increase in non-performing loans 195 342
Loans 90 Days or More Past Due [Member] | Real Estate - Residential [Member]    
Financing Receivable, Impaired [Line Items]    
Increase in non-performing loans 541 1,097
Loans 90 Days or More Past Due [Member] | Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Increase in non-performing loans $ 13 $ 13