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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due $ 3,692 $ 8,096  
Current 402,721 370,314  
Total loans 406,413 378,410 $ 374,690
Non- Accrual Loans 4,930 8,000  
90 Days or More Past Due and Accruing 147    
Construction and Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 430 2,512  
Current 29,505 26,963  
Total loans 29,935 29,475 29,862
Non- Accrual Loans 1,911 1,787  
Secured by 1-4 Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 1,292 1,581  
Current 178,127 162,146  
Total loans 179,419 163,727 155,298
Non- Accrual Loans 298 1,342  
90 Days or More Past Due and Accruing 55    
Other Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 1,666 3,873  
Current 163,995 147,929  
Total loans 165,661 151,802  
Non- Accrual Loans 2,622 4,756  
Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 280 116  
Current 19,670 21,050  
Total loans 19,950 21,166 22,943
Non- Accrual Loans 99 115  
90 Days or More Past Due and Accruing 92    
Consumer and Other Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 24 14  
Current 11,424 12,226  
Total loans 11,448 12,240 $ 11,818
30 - 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 2,059 3,523  
30 - 59 Days Past Due [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 430 2,441  
30 - 59 Days Past Due [Member] | Secured by 1-4 Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 1,004 504  
30 - 59 Days Past Due [Member] | Other Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 419 554  
30 - 59 Days Past Due [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 188 10  
30 - 59 Days Past Due [Member] | Consumer and Other Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 18 14  
60 - 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 25 1,300  
60 - 89 Days Past Due [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due   71  
60 - 89 Days Past Due [Member] | Secured by 1-4 Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 19 323  
60 - 89 Days Past Due [Member] | Other Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due   800  
60 - 89 Days Past Due [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due   106  
60 - 89 Days Past Due [Member] | Consumer and Other Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 6    
> 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 1,608 3,273  
> 90 Days Past Due [Member] | Secured by 1-4 Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 269 754  
> 90 Days Past Due [Member] | Other Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 1,247 $ 2,519  
> 90 Days Past Due [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due $ 92