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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

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