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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | $ 2,859 | $ 3,025 |
Current | 511,848 | 483,042 |
Total Loans | 514,707 | 486,067 | $ 470,834
Non-accrual Loans | 2,121 | 1,520 |
90 Days or More Past Due and Accruing | 89 | 116 |
30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 1,449 | 1,356 |
60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 942 | 1,227 |
90 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 468 | 442 |
Real estate loans | Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 540 | 40 |
Current | 36,642 | 34,659 |
Total Loans | 37,182 | 34,699 | 34,518
Non-accrual Loans | 1,081 | 1,033 |
90 Days or More Past Due and Accruing | 0 | 0 |
Real estate loans | Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 1,029 | 1,560 |
Current | 202,867 | 197,203 |
Total Loans | 203,896 | 198,763 | 196,492
Non-accrual Loans | 610 | 413 |
90 Days or More Past Due and Accruing | 51 | 84 |
Real estate loans | Other real estate loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 1,149 | 1,022 |
Current | 221,005 | 210,188 |
Total Loans | 222,154 | 211,210 | 202,843
Non-accrual Loans | 430 | 74 |
90 Days or More Past Due and Accruing | 0 | 0 |
Real estate loans | 30-59 Days Past Due | Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 345 | 0 |
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 | 468 | 980 |
Real estate loans | 30-59 Days Past Due | Other real estate loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 562 | 321 |
Real estate loans | 60-89 Days Past Due | Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 195 | 40 |
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 | 131 | 170 |
Real estate loans | 60-89 Days Past Due | Other real estate loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 587 | 701 |
Real estate loans | 90 Days Past Due | Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Real estate loans | 90 Days Past Due | Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 430 | 410 |
Real estate loans | 90 Days Past Due | Other real estate loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Commercial and industrial loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 64 | 377 |
Current | 34,383 | 29,604 |
Total Loans | 34,447 | 29,981 | 25,851
Non-accrual Loans | 0 | 0 |
90 Days or More Past Due and Accruing | 35 | 32 |
Commercial and industrial loans | 30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 36 |
Commercial and industrial loans | 60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 29 | 309 |
Commercial and industrial loans | 90 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 35 | 32 |
Consumer and other loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 77 | 26 |
Current | 16,951 | 11,388 |
Total Loans | 17,028 | 11,414 | $ 11,130
Non-accrual Loans | 0 | 0 |
90 Days or More Past Due and Accruing | 3 | 0 |
Consumer and other loans | 30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 74 | 19 |
Consumer and other loans | 60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 7 |
Consumer and other loans | 90 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | $ 3 | $ 0 |

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