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Loans - Analysis of the Credit Risk Profile of Each Loan Class (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 522,201 | $ 486,067
Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 507,176 | 463,690
Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 5,225 | 13,073
Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 9,800 | 9,304
Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 0
Real estate loans | Construction and land development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 35,927 | 34,699
Real estate loans | Construction and land development | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 31,553 | 29,416
Real estate loans | Construction and land development | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 2,268 | 2,402
Real estate loans | Construction and land development | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 2,106 | 2,881
Real estate loans | Construction and land development | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 0
Real estate loans | Secured by 1-4 family residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 208,177 | 198,763
Real estate loans | Secured by 1-4 family residential | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 204,166 | 193,395
Real estate loans | Secured by 1-4 family residential | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 1,933 | 3,295
Real estate loans | Secured by 1-4 family residential | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 2,078 | 2,073
Real estate loans | Secured by 1-4 family residential | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 0
Real estate loans | Other real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 222,256 | 211,210
Real estate loans | Other real estate | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 215,773 | 200,009
Real estate loans | Other real estate | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 971 | 6,990
Real estate loans | Other real estate | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 5,512 | 4,211
Real estate loans | Other real estate | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 0
Commercial and industrial loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 38,763 | 29,981
Commercial and industrial loans | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 38,606 | 29,456
Commercial and industrial loans | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 53 | 386
Commercial and industrial loans | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 104 | 139
Commercial and industrial loans | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 0
Consumer and other loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 17,078 | 11,414
Consumer and other loans | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 17,078 | 11,414
Consumer and other loans | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 0
Consumer and other loans | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 0 | 0
Consumer and other loans | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | $ 0 | $ 0

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