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Loans - Analysis of the Credit Risk Profile of Each Loan Class (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | $ 503,833 | $ 486,067 | $ 465,546
Construction and land development |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 36,783 | 34,699 | 33,232
Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 205,114 | 198,763 | 196,295
Other real estate loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 215,742 | 211,210 |
Commercial and industrial loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 31,201 | 29,981 | 24,721
Consumer and Other Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 14,993 | 11,414 | $ 11,136
Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 482,247 | 463,690 |
Pass | Construction and land development |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 31,272 | 29,416 |
Pass | Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 200,446 | 193,395 |
Pass | Other real estate loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 204,820 | 200,009 |
Pass | Commercial and industrial loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 30,716 | 29,456 |
Pass | Consumer and Other Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 14,993 | 11,414 |
Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 10,378 | 13,073 |
Special Mention | Construction and land development |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 2,556 | 2,402 |
Special Mention | Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 2,388 | 3,295 |
Special Mention | Other real estate loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 5,066 | 6,990 |
Special Mention | Commercial and industrial loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 368 | 386 |
Special Mention | Consumer and Other Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 0 | 0 |
Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 11,208 | 9,304 |
Substandard | Construction and land development |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 2,955 | 2,881 |
Substandard | Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 2,280 | 2,073 |
Substandard | Other real estate loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 5,856 | 4,211 |
Substandard | Commercial and industrial loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 117 | 139 |
Substandard | Consumer and Other Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 0 | 0 |
Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 0 | 0 |
Doubtful | Construction and land development |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 0 | 0 |
Doubtful | Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 0 | 0 |
Doubtful | Other real estate loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 0 | 0 |
Doubtful | Commercial and industrial loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 0 | 0 |
Doubtful | Consumer and Other Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | $ 0 | $ 0 |

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