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Allowance for Loan Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Detail) - USD ($) $ in Thousands	9 Months Ended			12 Months Ended
	Sep. 30, 2016		Sep. 30, 2015	Dec. 31, 2015
Allowance for loan losses:
Beginning Balance	$ 5,524	[1]	$ 6,718	$ 6,718
Charge-offs	(451)		(1,420)	(1,838)
Recoveries	537		377	744
Provision for (recovery of) loan losses			(100)	(100)
Ending Balance	5,610		5,575	5,524	[1]
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	256		750	544
Allowance for loan losses, Collectively evaluated for impairment	5,354		4,825	4,980
Loans:
Ending Balance	470,834		406,413	438,999
Loans, Individually evaluated for impairment	6,913		8,840	7,705
Loans, Collectively evaluated for impairment	463,921		397,573	431,294
Construction and Land Development [Member]
Allowance for loan losses:
Beginning Balance	1,532		1,403	1,403
Recoveries	4		3	4
Provision for (recovery of) loan losses	(1,084)		(150)	125
Ending Balance	452		1,256	1,532
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment			132	326
Allowance for loan losses, Collectively evaluated for impairment	452		1,124	1,206
Loans:
Ending Balance	34,518		29,935	33,135
Loans, Individually evaluated for impairment	2,749		3,081	2,544
Loans, Collectively evaluated for impairment	31,769		26,854	30,591
Secured by 1-4 Family Residential [Member]
Allowance for loan losses:
Beginning Balance	939		1,204	1,204
Charge-offs	(53)		(47)	(142)
Recoveries	290		90	373
Provision for (recovery of) loan losses	(173)		(368)	(496)
Ending Balance	1,003		879	939
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	33		22	23
Allowance for loan losses, Collectively evaluated for impairment	970		857	916
Loans:
Ending Balance	196,492		179,419	189,286
Loans, Individually evaluated for impairment	2,094		2,151	2,044
Loans, Collectively evaluated for impairment	194,398		177,268	187,242
Other Real Estate [Member]
Allowance for loan losses:
Beginning Balance	2,534		3,658	3,658
Charge-offs			(950)	(1,125)
Recoveries	1		2	2
Provision for (recovery of) loan losses	1,002		288	(1)
Ending Balance	3,537		2,998	2,534
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	223		596	195
Allowance for loan losses, Collectively evaluated for impairment	3,314		2,402	2,339
Loans:
Ending Balance	202,843		165,661	181,447
Loans, Individually evaluated for impairment	1,991		3,509	3,023
Loans, Collectively evaluated for impairment	200,852		162,152	178,424
Commercial and Industrial [Member]
Allowance for loan losses:
Beginning Balance	306		310	310
Charge-offs			(59)	(59)
Recoveries	10		69	72
Provision for (recovery of) loan losses	13		(68)	(17)
Ending Balance	329		252	306
Ending Balance:
Allowance for loan losses, Collectively evaluated for impairment	329		252	306
Loans:
Ending Balance	25,851		19,950	24,048
Loans, Individually evaluated for impairment	79		99	94
Loans, Collectively evaluated for impairment	25,772		19,851	23,954
Consumer and Other Loans [Member]
Allowance for loan losses:
Beginning Balance	213		143	143
Charge-offs	(398)		(364)	(512)
Recoveries	232		213	293
Provision for (recovery of) loan losses	242		198	289
Ending Balance	289		190	213
Ending Balance:
Allowance for loan losses, Collectively evaluated for impairment	289		190	213
Loans:
Ending Balance	11,130		11,448	11,083
Loans, Collectively evaluated for impairment	$ 11,130		$ 11,448	$ 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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