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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | $ 2,437 | $ 3,025 |
Current | 501,396 | 483,042 |
Total Loans | 503,833 | 486,067 | $ 465,546
Non-accrual Loans | 1,913 | 1,520 |
90 Days or More Past Due and Accruing | 151 | 116 |
Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 157 | 40 |
Current | 36,626 | 34,659 |
Total Loans | 36,783 | 34,699 | 33,232
Non-accrual Loans | 730 | 1,033 |
90 Days or More Past Due and Accruing | 0 | 0 |
Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 1,112 | 1,560 |
Current | 204,002 | 197,203 |
Total Loans | 205,114 | 198,763 | 196,295
Non-accrual Loans | 724 | 413 |
90 Days or More Past Due and Accruing | 151 | 84 |
Other real estate loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 1,075 | 1,022 |
Current | 214,667 | 210,188 |
Total Loans | 215,742 | 211,210 |
Non-accrual Loans | 459 | 74 |
90 Days or More Past Due and Accruing | 0 | 0 |
Commercial and industrial loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 52 | 377 |
Current | 31,149 | 29,604 |
Total Loans | 31,201 | 29,981 | 24,721
Non-accrual Loans | 0 | 0 |
90 Days or More Past Due and Accruing | 0 | 32 |
Consumer and other loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 41 | 26 |
Current | 14,952 | 11,388 |
Total Loans | 14,993 | 11,414 | $ 11,136
Non-accrual Loans | 0 | 0 |
90 Days or More Past Due and Accruing | 0 | 0 |
30-59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 666 | 1,356 |
30-59 Days Past Due | Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
30-59 Days Past Due | Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 231 | 980 |
30-59 Days Past Due | Other real estate loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 365 | 321 |
30-59 Days Past Due | Commercial and industrial loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 29 | 36 |
30-59 Days Past Due | Consumer and other loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 41 | 19 |
60-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 703 | 1,227 |
60-89 Days Past Due | Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 157 | 40 |
60-89 Days Past Due | Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 272 | 170 |
60-89 Days Past Due | Other real estate loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 251 | 701 |
60-89 Days Past Due | Commercial and industrial loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 23 | 309 |
60-89 Days Past Due | Consumer and other loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 7 |
90 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 1,068 | 442 |
90 Days Past Due | Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
90 Days Past Due | Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 609 | 410 |
90 Days Past Due | Other real estate loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 459 | 0 |
90 Days Past Due | Commercial and industrial loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 32 |
90 Days Past Due | Consumer and other loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | $ 0 | $ 0 |

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