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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 |

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