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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | $ 5,618 | $ 4,571 |
Current | 534,203 | 517,630 |
Total Loans | 539,821 | 522,201 | $ 514,707
Non-accrual Loans | 2,738 | 937 |
90 Days or More Past Due and Accruing | 261 | 183 |
30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 1,973 | 3,869 |
60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 2,468 | 477 |
90 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 1,177 | 225 |
Real estate loans | Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 720 | 1,056 |
Current | 42,262 | 34,871 |
Total Loans | 42,982 | 35,927 | 37,182
Non-accrual Loans | 343 | 269 |
90 Days or More Past Due and Accruing | 86 | 40 |
Real estate loans | Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 1,758 | 957 |
Current | 210,180 | 207,220 |
Total Loans | 211,938 | 208,177 | 203,896
Non-accrual Loans | 438 | 267 |
90 Days or More Past Due and Accruing | 113 | 106 |
Real estate loans | Other real estate loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 2,171 | 2,222 |
Current | 222,732 | 220,034 |
Total Loans | 224,903 | 222,256 | 222,154
Non-accrual Loans | 1,760 | 401 |
90 Days or More Past Due and Accruing | 0 | 10 |
Real estate loans | 30-59 Days Past Due | Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 38 | 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 | 1,228 | 606 |
Real estate loans | 30-59 Days Past Due | Other real estate loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 148 | 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 | 254 | 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 | 66 | 203 |
Real estate loans | 60-89 Days Past Due | Other real estate loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 1,800 | 170 |
Real estate loans | 90 Days Past Due | Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 428 | 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 | 464 | 148 |
Real estate loans | 90 Days Past Due | Other real estate loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 223 | 10 |
Commercial and industrial loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 761 | 209 |
Current | 42,100 | 38,554 |
Total Loans | 42,861 | 38,763 | 34,447
Non-accrual Loans | 197 | 0 |
90 Days or More Past Due and Accruing | 53 | 0 |
Commercial and industrial loans | 30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 483 | 184 |
Commercial and industrial loans | 60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 225 | 25 |
Commercial and industrial loans | 90 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 53 | 0 |
Consumer and other loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 208 | 127 |
Current | 16,929 | 16,951 |
Total Loans | 17,137 | 17,078 | $ 17,028
Non-accrual Loans | 0 | 0 |
90 Days or More Past Due and Accruing | 9 | 27 |
Consumer and other loans | 30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 76 | 51 |
Consumer and other loans | 60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 123 | 49 |
Consumer and other loans | 90 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | $ 9 | $ 27 |

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