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Loans - Summary of Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017		Mar. 31, 2017	Dec. 31, 2016
Real estate loans:
Loans	$ 520,936	$ 522,201		$ 497,770
Allowance for loan losses	(5,272)	(5,326)	[1]	(5,451)	$ (5,321)
Loans, net	515,664	516,875	[1]
Real estate loans | Construction and land development
Real estate loans:
Loans	33,941	35,927		36,024
Allowance for loan losses	(396)	(414)		(481)	(441)
Real estate loans | Secured by 1-4 family residential
Real estate loans:
Loans	208,338	208,177		205,623
Allowance for loan losses	(778)	(775)		(960)	(1,019)
Real estate loans | Other real estate loans
Real estate loans:
Loans	222,352	222,256		216,591
Allowance for loan losses	(2,967)	(2,948)		(3,267)	(3,142)
Commercial and industrial loans
Real estate loans:
Loans	39,253	38,763		29,192
Allowance for loan losses	(451)	(418)		(375)	(380)
Consumer and other loans
Real estate loans:
Loans	17,052	17,078		10,340
Allowance for loan losses	$ (680)	$ (771)		$ (368)	$ (339)
[1] Derived from audited consolidated financial statements.

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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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