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Loans - Summary of Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Real estate loans: |  |  |
Loans | $ 522,201 | $ 486,067 |
Allowance for loan losses | (5,326) | (5,321) | $ (5,524)
Loans, net | 516,875 | 480,746 |
Real estate loans | Construction and land development |  |  |
Real estate loans: |  |  |
Loans | 35,927 | 34,699 |
Allowance for loan losses | (414) | (441) | (1,532)
Real estate loans | Secured by 1-4 family residential |  |  |
Real estate loans: |  |  |
Loans | 208,177 | 198,763 |
Allowance for loan losses | (775) | (1,019) | (939)
Real estate loans | Other real estate |  |  |
Real estate loans: |  |  |
Loans | 222,256 | 211,210 |
Allowance for loan losses | (2,948) | (3,142) | (2,534)
Commercial and industrial loans |  |  |
Real estate loans: |  |  |
Loans | 38,763 | 29,981 |
Allowance for loan losses | (418) | (380) | (306)
Consumer and other loans |  |  |
Real estate loans: |  |  |
Loans | 17,078 | 11,414 |
Allowance for loan losses | $ (771) | $ (339) | $ (213)

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