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Loans - Summary of Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Real estate loans: |  |  |  |  |
Loans | $ 514,707 | $ 486,067 |  | $ 470,834 |
Allowance for loan losses | (5,301) | (5,321) | [1] | (5,610) | $ (5,524)
Loans, net | 509,406 | 480,746 | [1] |  |
Real estate loans | Construction and land development |  |  |  |  |
Real estate loans: |  |  |  |  |
Loans | 37,182 | 34,699 |  | 34,518 |
Allowance for loan losses | (435) | (441) |  | (452) | (1,532)
Real estate loans | Secured by 1-4 family residential |  |  |  |  |
Real estate loans: |  |  |  |  |
Loans | 203,896 | 198,763 |  | 196,492 |
Allowance for loan losses | (762) | (1,019) |  | (1,003) | (939)
Real estate loans | Other real estate loans |  |  |  |  |
Real estate loans: |  |  |  |  |
Loans | 222,154 | 211,210 |  | 202,843 |
Allowance for loan losses | (2,960) | (3,142) |  | (3,537) | (2,534)
Commercial and industrial loans |  |  |  |  |
Real estate loans: |  |  |  |  |
Loans | 34,447 | 29,981 |  | 25,851 |
Allowance for loan losses | (387) | (380) |  | (329) | (306)
Consumer and other loans |  |  |  |  |
Real estate loans: |  |  |  |  |
Loans | 17,028 | 11,414 |  | 11,130 |
Allowance for loan losses | $ (757) | $ (339) |  | $ (289) | $ (213)
[1] | Derived from audited consolidated financial statements.

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