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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due $ 2,590 $ 2,564  
Current 462,956 436,435  
Total loans 465,546 438,999 $ 391,721
Non- Accrual Loans 4,057 3,854  
90 Days or More Past Due and Accruing 11 92  
Construction and Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 237    
Current 32,995 33,135  
Total loans 33,232 33,135 32,009
Non- Accrual Loans 1,539 1,269  
Secured by 1-4 Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 1,239 917  
Current 195,056 188,369  
Total loans 196,295 189,286 173,265
Non- Accrual Loans 345 346  
Other Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 1,046 1,535  
Current 199,116 179,912  
Total loans 200,162 181,447  
Non- Accrual Loans 2,089 2,145  
Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 51 92  
Current 24,670 23,956  
Total loans 24,721 24,048 19,319
Non- Accrual Loans 84 94  
90 Days or More Past Due and Accruing 8 92  
Consumer and Other Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 17 20  
Current 11,119 11,063  
Total loans 11,136 11,083 $ 11,732
90 Days or More Past Due and Accruing 3    
30 - 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 1,233 1,042  
30 - 59 Days Past Due [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 111    
30 - 59 Days Past Due [Member] | Secured by 1-4 Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 768 635  
30 - 59 Days Past Due [Member] | Other Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 331 387  
30 - 59 Days Past Due [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 9    
30 - 59 Days Past Due [Member] | Consumer and Other Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 14 20  
60 - 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 952 376  
60 - 89 Days Past Due [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 126    
60 - 89 Days Past Due [Member] | Secured by 1-4 Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 202 18  
60 - 89 Days Past Due [Member] | Other Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 590 358  
60 - 89 Days Past Due [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 34    
> 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 405 1,146  
> 90 Days Past Due [Member] | Secured by 1-4 Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 269 264  
> 90 Days Past Due [Member] | Other Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 125 790  
> 90 Days Past Due [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 8 $ 92  
> 90 Days Past Due [Member] | Consumer and Other Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due $ 3