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Loans - Summary of Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015		Sep. 30, 2015	Dec. 31, 2014
Real estate loans:
Loans	$ 470,834	$ 438,999		$ 406,413
Allowance for loan losses	(5,610)	(5,524)	[1]	(5,575)	$ (6,718)
Loans, net	465,224	433,475	[1]
Construction and Land Development [Member]
Real estate loans:
Loans	34,518	33,135		29,935
Allowance for loan losses	(452)	(1,532)		(1,256)	(1,403)
Secured by 1-4 Family Residential [Member]
Real estate loans:
Loans	196,492	189,286		179,419
Allowance for loan losses	(1,003)	(939)		(879)	(1,204)
Other Real Estate Loans [Member]
Real estate loans:
Loans	202,843	181,447
Commercial and Industrial [Member]
Real estate loans:
Loans	25,851	24,048		19,950
Allowance for loan losses	(329)	(306)		(252)	(310)
Consumer and Other Loans [Member]
Real estate loans:
Loans	11,130	11,083		11,448
Allowance for loan losses	$ (289)	$ (213)		$ (190)	$ (143)
[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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