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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, 2018		Mar. 31, 2017	Dec. 31, 2017
Allowance for loan losses:
Beginning Balance	$ 5,326	[1]	$ 5,321	$ 5,321
Charge-offs	(206)		(106)	(733)
Recoveries	52		236	638
Provision for (recovery of) loan losses	100		0	100
Ending Balance	5,272		5,451	5,326	[1]
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	0		31	0
Allowance for loan losses, Collectively evaluated for impairment	5,272		5,420	5,326
Loans:
Total Loans	520,936		497,770	522,201
Losses, Individually evaluated for impairment	3,530		4,513	3,811
Losses, Collectively evaluated for impairment	517,406		493,257	518,390
Real estate loans | Construction and Land Development
Allowance for loan losses:
Beginning Balance	414		441	441
Charge-offs	0		0	0
Recoveries	0		1	11
Provision for (recovery of) loan losses	(18)		39	(38)
Ending Balance	396		481	414
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	0		0	0
Allowance for loan losses, Collectively evaluated for impairment	396		481	414
Loans:
Total Loans	33,941		36,024	35,927
Losses, Individually evaluated for impairment	874		2,022	1,150
Losses, Collectively evaluated for impairment	33,067		34,002	34,777
Real estate loans | Secured by 1-4 Family Residential
Allowance for loan losses:
Beginning Balance	775		1,019	1,019
Charge-offs	(2)		0	(126)
Recoveries	3		128	302
Provision for (recovery of) loan losses	2		(187)	(420)
Ending Balance	778		960	775
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	0		31	0
Allowance for loan losses, Collectively evaluated for impairment	778		929	775
Loans:
Total Loans	208,338		205,623	208,177
Losses, Individually evaluated for impairment	1,332		1,443	1,307
Losses, Collectively evaluated for impairment	207,006		204,180	206,870
Real estate loans | Other Real Estate
Allowance for loan losses:
Beginning Balance	2,948		3,142	3,142
Charge-offs	0		0	0
Recoveries	1		47	50
Provision for (recovery of) loan losses	18		78	(244)
Ending Balance	2,967		3,267	2,948
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	0		0	0
Allowance for loan losses, Collectively evaluated for impairment	2,967		3,267	2,948
Loans:
Total Loans	222,352		216,591	222,256
Losses, Individually evaluated for impairment	1,263		977	1,289
Losses, Collectively evaluated for impairment	221,089		215,614	220,967
Commercial and industrial loans
Allowance for loan losses:
Beginning Balance	418		380	380
Charge-offs	(8)		0	0
Recoveries	1		5	10
Provision for (recovery of) loan losses	40		(10)	28
Ending Balance	451		375	418
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	0		0	0
Allowance for loan losses, Collectively evaluated for impairment	451		375	418
Loans:
Total Loans	39,253		29,192	38,763
Losses, Individually evaluated for impairment	61		71	65
Losses, Collectively evaluated for impairment	39,192		29,121	38,698
Consumer and other loans
Allowance for loan losses:
Beginning Balance	771		339	339
Charge-offs	(196)		(106)	(607)
Recoveries	47		55	265
Provision for (recovery of) loan losses	58		80	774
Ending Balance	680		368	771
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	0		0	0
Allowance for loan losses, Collectively evaluated for impairment	680		368	771
Loans:
Total Loans	17,052		10,340	17,078
Losses, Individually evaluated for impairment	0		0	0
Losses, Collectively evaluated for impairment	$ 17,052		$ 10,340	$ 17,078
[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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