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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 3,578 $ 4,571  
Current 517,358 517,630  
Total Loans 520,936 522,201 $ 497,770
Non-accrual Loans 682 937  
90 Days or More Past Due and Accruing 773 183  
30-59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,413 3,869  
60-89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,189 477  
90 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 976 225  
Real estate loans | Construction and land development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 901 1,056  
Current 33,040 34,871  
Total Loans 33,941 35,927 36,024
Non-accrual Loans 0 269  
90 Days or More Past Due and Accruing 512 40  
Real estate loans | Secured by 1-4 family residential      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,572 957  
Current 206,766 207,220  
Total Loans 208,338 208,177 205,623
Non-accrual Loans 300 267  
90 Days or More Past Due and Accruing 99 106  
Real estate loans | Other real estate loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 814 2,222  
Current 221,538 220,034  
Total Loans 222,352 222,256 216,591
Non-accrual Loans 382 401  
90 Days or More Past Due and Accruing 162 10  
Real estate loans | 30-59 Days Past Due | Construction and land development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 45 986  
Real estate loans | 30-59 Days Past Due | Secured by 1-4 family residential      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 873 606  
Real estate loans | 30-59 Days Past Due | Other real estate loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 268 2,042  
Real estate loans | 60-89 Days Past Due | Construction and land development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 344 30  
Real estate loans | 60-89 Days Past Due | Secured by 1-4 family residential      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 397 203  
Real estate loans | 60-89 Days Past Due | Other real estate loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 384 170  
Real estate loans | 90 Days Past Due | Construction and land development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 512 40  
Real estate loans | 90 Days Past Due | Secured by 1-4 family residential      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 302 148  
Real estate loans | 90 Days Past Due | Other real estate loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 162 10  
Commercial and industrial loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 96 209  
Current 39,157 38,554  
Total Loans 39,253 38,763 29,192
Non-accrual Loans 0 0  
90 Days or More Past Due and Accruing 0 0  
Commercial and industrial loans | 30-59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 83 184  
Commercial and industrial loans | 60-89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 13 25  
Commercial and industrial loans | 90 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Consumer and other loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 195 127  
Current 16,857 16,951  
Total Loans 17,052 17,078 $ 10,340
Non-accrual Loans 0 0  
90 Days or More Past Due and Accruing 0 27  
Consumer and other loans | 30-59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 144 51  
Consumer and other loans | 60-89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 51 49  
Consumer and other loans | 90 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 0 $ 27