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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, 2017		Mar. 31, 2016	Dec. 31, 2016
Allowance for loan losses:
Beginning Balance	$ 5,321	[1]	$ 5,524	$ 5,524
Charge-offs	(106)		(120)	(788)
Recoveries	236		116	585
Provision for (recovery of) loan losses	0		0
Ending Balance	5,451		5,520	5,321	[1]
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	31		434	37
Allowance for loan losses, Collectively evaluated for impairment	5,420		5,086	5,284
Loans:
Ending Balance	497,770		454,076	486,067
Loans, Individually evaluated for impairment	4,513		7,816	4,860
Loans, Collectively evaluated for impairment	493,257		446,260	481,207
Construction and Land Development [Member]
Allowance for loan losses:
Beginning Balance	441		1,532	1,532
Recoveries	1		1	4
Provision for (recovery of) loan losses	39		(163)	(1,095)
Ending Balance	481		1,370	441
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment			222
Allowance for loan losses, Collectively evaluated for impairment	481		1,148	441
Loans:
Ending Balance	36,024		31,505	34,699
Loans, Individually evaluated for impairment	2,022		2,675	1,973
Loans, Collectively evaluated for impairment	34,002		28,830	32,726
Secured by 1-4 Family Residential [Member]
Allowance for loan losses:
Beginning Balance	1,019		939	939
Charge-offs			(2)	(83)
Recoveries	128		9	293
Provision for (recovery of) loan losses	(187)		38	(130)
Ending Balance	960		984	1,019
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	31		22	37
Allowance for loan losses, Collectively evaluated for impairment	929		962	982
Loans:
Ending Balance	205,623		196,165	198,763
Loans, Individually evaluated for impairment	1,443		2,062	1,828
Loans, Collectively evaluated for impairment	204,180		194,103	196,935
Other Real Estate [Member]
Allowance for loan losses:
Beginning Balance	3,142		2,534	2,534
Charge-offs				(165)
Recoveries	47			2
Provision for (recovery of) loan losses	78		117	771
Ending Balance	3,267		2,651	3,142
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment			190
Allowance for loan losses, Collectively evaluated for impairment	3,267		2,461	3,142
Loans:
Ending Balance	216,591		191,306	211,210
Loans, Individually evaluated for impairment	977		2,990	984
Loans, Collectively evaluated for impairment	215,614		188,316	210,226
Commercial and Industrial [Member]
Allowance for loan losses:
Beginning Balance	380		306	306
Recoveries	5		3	11
Provision for (recovery of) loan losses	(10)		(12)	63
Ending Balance	375		297	380
Ending Balance:
Allowance for loan losses, Collectively evaluated for impairment	375		297	380
Loans:
Ending Balance	29,192		24,215	29,981
Loans, Individually evaluated for impairment	71		89	75
Loans, Collectively evaluated for impairment	29,121		24,126	29,906
Consumer and Other Loans [Member]
Allowance for loan losses:
Beginning Balance	339		213	213
Charge-offs	(106)		(118)	(540)
Recoveries	55		103	275
Provision for (recovery of) loan losses	80		20	391
Ending Balance	368		218	339
Ending Balance:
Allowance for loan losses, Collectively evaluated for impairment	368		218	339
Loans:
Ending Balance	10,340		10,885	11,414
Loans, Collectively evaluated for impairment	$ 10,340		$ 10,885	$ 11,414
[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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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