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Allowance for Loan Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended			12 Months Ended
	Jun. 30, 2015	Jun. 30, 2016		Jun. 30, 2015	Dec. 31, 2015
Allowance for loan losses:
Beginning Balance		$ 5,524	[1]	$ 6,718	$ 6,718
Charge-offs		(256)		(783)	(1,838)
Recoveries		466		294	744
Provision for (recovery of) loan losses	$ (100)			(100)	(100)
Ending Balance	6,129	5,734		6,129	5,524	[1]
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	1,563	184		1,563	544
Allowance for loan losses, Collectively evaluated for impairment	4,566	5,550		4,566	4,980
Loans:
Ending Balance	391,721	465,546		391,721	438,999
Loans, Individually evaluated for impairment	10,770	7,384		10,770	7,705
Loans, Collectively evaluated for impairment	380,951	458,162		380,951	431,294
Construction and Land Development [Member]
Allowance for loan losses:
Beginning Balance		1,532		1,403	1,403
Recoveries		2		2	4
Provision for (recovery of) loan losses		865		204	125
Ending Balance	1,609	669		1,609	1,532
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	437			437	326
Allowance for loan losses, Collectively evaluated for impairment	1,172	669		1,172	1,206
Loans:
Ending Balance	32,009	33,232		32,009	33,135
Loans, Individually evaluated for impairment	3,319	2,664		3,319	2,544
Loans, Collectively evaluated for impairment	28,690	30,568		28,690	30,591
Secured by 1-4 Family Residential [Member]
Allowance for loan losses:
Beginning Balance		939		1,204	1,204
Charge-offs		(2)		(47)	(142)
Recoveries		279		83	373
Provision for (recovery of) loan losses		178		(314)	(496)
Ending Balance	926	1,038		926	939
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	79			79	23
Allowance for loan losses, Collectively evaluated for impairment	847	1,038		847	916
Loans:
Ending Balance	173,265	196,295		173,265	189,286
Loans, Individually evaluated for impairment	2,387	2,022		2,387	2,044
Loans, Collectively evaluated for impairment	170,878	194,273		170,878	187,242
Other Real Estate [Member]
Allowance for loan losses:
Beginning Balance		2,534		3,658	3,658
Charge-offs				(471)	(1,125)
Recoveries		1		1	2
Provision for (recovery of) loan losses		(874)		(16)	(1)
Ending Balance	3,172	3,409		3,172	2,534
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	1,025	184		1,025	195
Allowance for loan losses, Collectively evaluated for impairment	2,147	3,225		2,147	2,339
Loans:
Ending Balance	155,396	200,162		155,396	181,447
Loans, Individually evaluated for impairment	4,944	2,614		4,944	3,023
Loans, Collectively evaluated for impairment	150,452	197,548		150,452	178,424
Commercial and Industrial [Member]
Allowance for loan losses:
Beginning Balance		306		310	310
Charge-offs				(59)	(59)
Recoveries		7		62	72
Provision for (recovery of) loan losses		(3)		(55)	(17)
Ending Balance	258	316		258	306
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	22			22
Allowance for loan losses, Collectively evaluated for impairment	236	316		236	306
Loans:
Ending Balance	19,319	24,721		19,319	24,048
Loans, Individually evaluated for impairment	120	84		120	94
Loans, Collectively evaluated for impairment	19,199	24,637		19,199	23,954
Consumer and Other Loans [Member]
Allowance for loan losses:
Beginning Balance		213		143	143
Charge-offs		(254)		(206)	(512)
Recoveries		177		146	293
Provision for (recovery of) loan losses		(166)		81	289
Ending Balance	164	302		164	213
Ending Balance:
Allowance for loan losses, Collectively evaluated for impairment	164	302		164	213
Loans:
Ending Balance	11,732	11,136		11,732	11,083
Loans, Collectively evaluated for impairment	$ 11,732	$ 11,136		$ 11,732	$ 11,083
[1] Derived from audited consolidated financial statements.

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Financing receivable loans and leases receivable.

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Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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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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Amount of expense related to estimated loss from loan and lease transactions.

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