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Allowance for Loan Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2016		Mar. 31, 2015	Dec. 31, 2015
Allowance for loan losses:
Beginning Balance	$ 5,524	[1]	$ 6,718	$ 6,718
Charge-offs	(120)		(112)	(1,838)
Recoveries	116		165	744
Provision for (recovery of) loan losses	0		0	(100)
Ending Balance	5,520		6,771	5,524	[1]
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	434		1,901	544
Allowance for loan losses, Collectively evaluated for impairment	5,086		4,870	4,980
Loans:
Ending Balance	454,076		398,517	438,999
Loans, Individually evaluated for impairment	7,816		13,034	7,705
Loans, Collectively evaluated for impairment	446,260		385,483	431,294
Construction and Land Development [Member]
Allowance for loan losses:
Beginning Balance	1,532		1,403	1,403
Recoveries	1		1	4
Provision for (recovery of) loan losses	163		197	125
Ending Balance	1,370		1,601	1,532
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	222		341	326
Allowance for loan losses, Collectively evaluated for impairment	1,148		1,260	1,206
Loans:
Ending Balance	31,505		33,344	33,135
Loans, Individually evaluated for impairment	2,675		3,071	2,544
Loans, Collectively evaluated for impairment	28,830		30,273	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	9		34	373
Provision for (recovery of) loan losses	(38)		(239)	(496)
Ending Balance	984		952	939
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	22		85	23
Allowance for loan losses, Collectively evaluated for impairment	962		867	916
Loans:
Ending Balance	196,165		172,874	189,286
Loans, Individually evaluated for impairment	2,062		2,747	2,044
Loans, Collectively evaluated for impairment	194,103		170,127	187,242
Other Real Estate [Member]
Allowance for loan losses:
Beginning Balance	2,534		3,658	3,658
Charge-offs				(1,125)
Recoveries			1	2
Provision for (recovery of) loan losses	(117)		137	(1)
Ending Balance	2,651		3,796	2,534
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	190		1,447	195
Allowance for loan losses, Collectively evaluated for impairment	2,461		2,349	2,339
Loans:
Ending Balance	191,306		158,896	181,447
Loans, Individually evaluated for impairment	2,990		7,103	3,023
Loans, Collectively evaluated for impairment	188,316		151,793	178,424
Commercial and Industrial [Member]
Allowance for loan losses:
Beginning Balance	306		310	310
Charge-offs				(59)
Recoveries	3		60	72
Provision for (recovery of) loan losses	12		(82)	(17)
Ending Balance	297		288	306
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment			28
Allowance for loan losses, Collectively evaluated for impairment	297		260	306
Loans:
Ending Balance	24,215		21,420	24,048
Loans, Individually evaluated for impairment	89		113	94
Loans, Collectively evaluated for impairment	24,126		21,307	23,954
Consumer and Other Loans [Member]
Allowance for loan losses:
Beginning Balance	213		143	143
Charge-offs	(118)		(65)	(512)
Recoveries	103		69	293
Provision for (recovery of) loan losses	(20)		(13)	289
Ending Balance	218		134	213
Ending Balance:
Allowance for loan losses, Collectively evaluated for impairment	218		134	213
Loans:
Ending Balance	10,885		11,983	11,083
Loans, Collectively evaluated for impairment	$ 10,885		$ 11,983	$ 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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-Publisher FASB
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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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