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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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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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