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Loans - Summary of Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016		Mar. 31, 2016	Jan. 01, 2016
Real estate loans:
Loans	$ 497,770	$ 486,067		$ 454,076
Allowance for loan losses	(5,451)	(5,321)	[1]	(5,520)	$ (5,524)
Loans, net	492,319	480,746	[1]
Construction and Land Development [Member]
Real estate loans:
Loans	36,024	34,699		31,505
Allowance for loan losses	(481)	(441)		(1,370)	(1,532)
Secured by 1-4 Family Residential [Member]
Real estate loans:
Loans	205,623	198,763		196,165
Allowance for loan losses	(960)	(1,019)		(984)	(939)
Other Real Estate Loans [Member]
Real estate loans:
Loans	216,591	211,210
Commercial and Industrial [Member]
Real estate loans:
Loans	29,192	29,981		24,215
Allowance for loan losses	(375)	(380)		(297)	(306)
Consumer and Other Loans [Member]
Real estate loans:
Loans	10,340	11,414		10,885
Allowance for loan losses	$ (368)	$ (339)		$ (218)	$ (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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