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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due $ 4,318 $ 2,564  
Current 466,516 436,435  
Total loans 470,834 438,999 $ 406,413
Non- Accrual Loans 3,521 3,854  
90 Days or More Past Due and Accruing 59 92  
Construction and Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 1,995    
Current 32,523 33,135  
Total loans 34,518 33,135 29,935
Non- Accrual Loans 1,632 1,269  
Secured by 1-4 Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 949 917  
Current 195,543 188,369  
Total loans 196,492 189,286 179,419
Non- Accrual Loans 339 346  
90 Days or More Past Due and Accruing 4    
Other Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 1,186 1,535  
Current 201,657 179,912  
Total loans 202,843 181,447  
Non- Accrual Loans 1,471 2,145  
Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 169 92  
Current 25,682 23,956  
Total loans 25,851 24,048 19,950
Non- Accrual Loans 79 94  
90 Days or More Past Due and Accruing 55 92  
Consumer and Other Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 19 20  
Current 11,111 11,063  
Total loans 11,130 11,083 $ 11,448
30 - 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 1,246 1,042  
30 - 59 Days Past Due [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 260    
30 - 59 Days Past Due [Member] | Secured by 1-4 Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 416 635  
30 - 59 Days Past Due [Member] | Other Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 477 387  
30 - 59 Days Past Due [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 82    
30 - 59 Days Past Due [Member] | Consumer and Other Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 11 20  
60 - 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 2,421 376  
60 - 89 Days Past Due [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 1,735    
60 - 89 Days Past Due [Member] | Secured by 1-4 Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 265 18  
60 - 89 Days Past Due [Member] | Other Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 381 358  
60 - 89 Days Past Due [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 32    
60 - 89 Days Past Due [Member] | Consumer and Other Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 8    
> 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 651 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 268 264  
> 90 Days Past Due [Member] | Other Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 328 790  
> 90 Days Past Due [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due $ 55 $ 92