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Loans - Summary of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017		Jun. 30, 2017	Dec. 31, 2016
Real estate loans:
Loans	$ 530,933	$ 522,201		$ 503,833
Allowance for loan losses	(5,039)	(5,326)	[1]	(5,444)	$ (5,321)
Loans, net	525,894	516,875	[1]
Real estate loans | Construction and land development
Real estate loans:
Loans	37,350	35,927		36,783
Allowance for loan losses	(406)	(414)		(482)	(441)
Real estate loans | Secured by 1-4 family residential
Real estate loans:
Loans	211,101	208,177		205,114
Allowance for loan losses	(791)	(775)		(872)	(1,019)
Real estate loans | Other real estate loans
Real estate loans:
Loans	224,362	222,256		215,742
Allowance for loan losses	(2,664)	(2,948)		(3,074)	(3,142)
Commercial and industrial loans
Real estate loans:
Loans	40,943	38,763		31,201
Allowance for loan losses	(425)	(418)		(375)	(380)
Consumer and other loans
Real estate loans:
Loans	17,177	17,078		14,993
Allowance for loan losses	$ (753)	$ (771)		$ (641)	$ (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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