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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due $ 2,841 $ 3,025  
Current 494,929 483,042  
Total loans 497,770 486,067 $ 454,076
Non- accrual Loans 1,596 1,520  
90 Days or More Past Due and Accruing 119 116  
Construction and Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 545 40  
Current 35,479 34,659  
Total loans 36,024 34,699 31,505
Non- accrual Loans 1,134 1,033  
Secured by 1-4 Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 1,321 1,560  
Current 204,302 197,203  
Total loans 205,623 198,763 196,165
Non- accrual Loans 389 413  
90 Days or More Past Due and Accruing 33 84  
Other Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 878 1,022  
Current 215,713 210,188  
Total loans 216,591 211,210  
Non- accrual Loans 73 74  
90 Days or More Past Due and Accruing 86    
Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 26 377  
Current 29,166 29,604  
Total loans 29,192 29,981 24,215
90 Days or More Past Due and Accruing   32  
Consumer and Other Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 71 26  
Current 10,269 11,388  
Total loans 10,340 11,414 $ 10,885
30 - 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 1,476 1,356  
30 - 59 Days Past Due [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 504    
30 - 59 Days Past Due [Member] | Secured by 1-4 Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 678 980  
30 - 59 Days Past Due [Member] | Other Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 254 321  
30 - 59 Days Past Due [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due   36  
30 - 59 Days Past Due [Member] | Consumer and Other Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 40 19  
60 - 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 1,130 1,227  
60 - 89 Days Past Due [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 41 40  
60 - 89 Days Past Due [Member] | Secured by 1-4 Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 494 170  
60 - 89 Days Past Due [Member] | Other Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 538 701  
60 - 89 Days Past Due [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 26 309  
60 - 89 Days Past Due [Member] | Consumer and Other Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 31 7  
> 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 235 442  
> 90 Days Past Due [Member] | Secured by 1-4 Family Residential [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due 149 410  
> 90 Days Past Due [Member] | Other Real Estate Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due $ 86    
> 90 Days Past Due [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Loans Past Due   $ 32