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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 4,571 $ 3,025
Current 517,630 483,042
Total Loans 522,201 486,067
Non- Accrual Loans 937 1,520
90 Days or More Past Due and Accruing 183 116
30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 3,869 1,356
60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 477 1,227
90 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 225 442
Real estate loans | Construction and land development    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,056 40
Current 34,871 34,659
Total Loans 35,927 34,699
Non- Accrual Loans 269 1,033
90 Days or More Past Due and Accruing 40 0
Real estate loans | Construction and land development | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 986 0
Real estate loans | Construction and land development | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 30 40
Real estate loans | Construction and land development | 90 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 40 0
Real estate loans | Secured by 1-4 family residential    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 957 1,560
Current 207,220 197,203
Total Loans 208,177 198,763
Non- Accrual Loans 267 413
90 Days or More Past Due and Accruing 106 84
Real estate loans | Secured by 1-4 family residential | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 606 980
Real estate loans | Secured by 1-4 family residential | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 203 170
Real estate loans | Secured by 1-4 family residential | 90 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 148 410
Real estate loans | Other real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,222 1,022
Current 220,034 210,188
Total Loans 222,256 211,210
Non- Accrual Loans 401 74
90 Days or More Past Due and Accruing 10 0
Real estate loans | Other real estate | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,042 321
Real estate loans | Other real estate | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 170 701
Real estate loans | Other real estate | 90 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 10 0
Commercial and industrial loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 209 377
Current 38,554 29,604
Total Loans 38,763 29,981
Non- Accrual Loans 0 0
90 Days or More Past Due and Accruing 0 32
Commercial and industrial loans | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 184 36
Commercial and industrial loans | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 25 309
Commercial and industrial loans | 90 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 32
Consumer and other loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 127 26
Current 16,951 11,388
Total Loans 17,078 11,414
Non- Accrual Loans 0 0
90 Days or More Past Due and Accruing 27 0
Consumer and other loans | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 51 19
Consumer and other loans | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 49 7
Consumer and other loans | 90 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 27 $ 0