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Loans - Analysis of the Credit Risk Profile of Each Loan Class (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | $ 514,707 | $ 486,067 | $ 470,834
Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 493,691 | 463,690 |
Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 9,677 | 13,073 |
Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 11,339 | 9,304 |
Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 0 | 0 |
Real estate loans | Construction and land development |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 37,182 | 34,699 | 34,518
Real estate loans | Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 203,896 | 198,763 | 196,492
Real estate loans | Other real estate loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 222,154 | 211,210 | 202,843
Real estate loans | Pass | Construction and land development |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 31,743 | 29,416 |
Real estate loans | Pass | Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 199,297 | 193,395 |
Real estate loans | Pass | Other real estate loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 211,342 | 200,009 |
Real estate loans | Special Mention | Construction and land development |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 2,420 | 2,402 |
Real estate loans | Special Mention | Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 2,171 | 3,295 |
Real estate loans | Special Mention | Other real estate loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 5,028 | 6,990 |
Real estate loans | Substandard | Construction and land development |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 3,019 | 2,881 |
Real estate loans | Substandard | Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 2,428 | 2,073 |
Real estate loans | Substandard | Other real estate loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 5,784 | 4,211 |
Real estate loans | Doubtful | Construction and land development |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 0 | 0 |
Real estate loans | Doubtful | Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 0 | 0 |
Real estate loans | Doubtful | Other real estate loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 0 | 0 |
Commercial and industrial loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 34,447 | 29,981 | 25,851
Commercial and industrial loans | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 34,281 | 29,456 |
Commercial and industrial loans | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 58 | 386 |
Commercial and industrial loans | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 108 | 139 |
Commercial and industrial loans | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 0 | 0 |
Consumer and other loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 17,028 | 11,414 | $ 11,130
Consumer and other loans | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 17,028 | 11,414 |
Consumer and other loans | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 0 | 0 |
Consumer and other loans | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 0 | 0 |
Consumer and other loans | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | $ 0 | $ 0 |

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