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Loans - Analysis of the Credit Risk Profile of Each Loan Class (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | $ 520,936 | $ 522,201 | $ 497,770
Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 505,886 | 507,176 |
Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 5,365 | 5,225 |
Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 9,685 | 9,800 |
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 | 33,941 | 35,927 | 36,024
Real estate loans | Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 208,338 | 208,177 | 205,623
Real estate loans | Other real estate loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 222,352 | 222,256 | 216,591
Real estate loans | Pass | Construction and land development |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 29,743 | 31,553 |
Real estate loans | Pass | Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 204,456 | 204,166 |
Real estate loans | Pass | Other real estate loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 215,723 | 215,773 |
Real estate loans | Special Mention | Construction and land development |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 2,448 | 2,268 |
Real estate loans | Special Mention | Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 1,908 | 1,933 |
Real estate loans | Special Mention | Other real estate loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 962 | 971 |
Real estate loans | Substandard | Construction and land development |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 1,750 | 2,106 |
Real estate loans | Substandard | Secured by 1-4 family residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 1,974 | 2,078 |
Real estate loans | Substandard | Other real estate loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 5,667 | 5,512 |
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 | 39,253 | 38,763 | 29,192
Commercial and industrial loans | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 38,912 | 38,606 |
Commercial and industrial loans | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 47 | 53 |
Commercial and industrial loans | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 294 | 104 |
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 | 17,052 | 17,078 | $ 10,340
Consumer and other loans | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Loans | 17,052 | 17,078 |
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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