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Loans - Summary of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016		Jun. 30, 2016	Dec. 31, 2015
Real estate loans:
Loans	$ 503,833	$ 486,067		$ 465,546
Allowance for loan losses	(5,444)	(5,321)	[1]	(5,734)	$ (5,524)
Loans, net	498,389	480,746	[1]
Construction and land development
Real estate loans:
Loans	36,783	34,699		33,232
Allowance for loan losses	(482)	(441)		(669)	(1,532)
Secured by 1-4 family residential
Real estate loans:
Loans	205,114	198,763		196,295
Allowance for loan losses	(872)	(1,019)		(1,038)	(939)
Other real estate loans
Real estate loans:
Loans	215,742	211,210
Commercial and industrial loans
Real estate loans:
Loans	31,201	29,981		24,721
Allowance for loan losses	(375)	(380)		(316)	(306)
Consumer and other loans
Real estate loans:
Loans	14,993	11,414		11,136
Allowance for loan losses	$ (641)	$ (339)		$ (302)	$ (213)
[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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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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