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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 2,437 $ 3,025  
Current 501,396 483,042  
Total Loans 503,833 486,067 $ 465,546
Non-accrual Loans 1,913 1,520  
90 Days or More Past Due and Accruing 151 116  
Construction and land development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 157 40  
Current 36,626 34,659  
Total Loans 36,783 34,699 33,232
Non-accrual Loans 730 1,033  
90 Days or More Past Due and Accruing 0 0  
Secured by 1-4 family residential      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,112 1,560  
Current 204,002 197,203  
Total Loans 205,114 198,763 196,295
Non-accrual Loans 724 413  
90 Days or More Past Due and Accruing 151 84  
Other real estate loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,075 1,022  
Current 214,667 210,188  
Total Loans 215,742 211,210  
Non-accrual Loans 459 74  
90 Days or More Past Due and Accruing 0 0  
Commercial and industrial loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 52 377  
Current 31,149 29,604  
Total Loans 31,201 29,981 24,721
Non-accrual Loans 0 0  
90 Days or More Past Due and Accruing 0 32  
Consumer and other loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 41 26  
Current 14,952 11,388  
Total Loans 14,993 11,414 $ 11,136
Non-accrual Loans 0 0  
90 Days or More Past Due and Accruing 0 0  
30-59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 666 1,356  
30-59 Days Past Due | Construction and land development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
30-59 Days Past Due | Secured by 1-4 family residential      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 231 980  
30-59 Days Past Due | Other real estate loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 365 321  
30-59 Days Past Due | Commercial and industrial loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 29 36  
30-59 Days Past Due | Consumer and other loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 41 19  
60-89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 703 1,227  
60-89 Days Past Due | Construction and land development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 157 40  
60-89 Days Past Due | Secured by 1-4 family residential      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 272 170  
60-89 Days Past Due | Other real estate loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 251 701  
60-89 Days Past Due | Commercial and industrial loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 23 309  
60-89 Days Past Due | Consumer and other loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 7  
90 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,068 442  
90 Days Past Due | Construction and land development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
90 Days Past Due | Secured by 1-4 family residential      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 609 410  
90 Days Past Due | Other real estate loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 459 0  
90 Days Past Due | Commercial and industrial loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 32  
90 Days Past Due | Consumer and other loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 0 $ 0