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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, 2019		Mar. 31, 2018	Dec. 31, 2018
Allowance for loan losses:
Beginning Balance	$ 5,009	[1]	$ 5,326	$ 5,326
Charge-offs	(228)		(206)	(1,169)
Recoveries	165		52	252
Provision for (recovery of) loan losses	0		100	600
Ending Balance	4,946		5,272	5,009	[1]
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	129		0	243
Allowance for loan losses, Collectively evaluated for impairment	4,817		5,272	4,766
Loans:
Total Loans	550,475		520,936	542,856
Losses, Individually evaluated for impairment	2,175		3,530	3,436
Losses, Collectively evaluated for impairment	548,300		517,406	539,420
Real estate loans | Construction and Land Development
Allowance for loan losses:
Beginning Balance	561		414	414
Charge-offs	0		0	0
Recoveries	50		0	0
Provision for (recovery of) loan losses	(6)		(18)	147
Ending Balance	605		396	561
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	71		0	71
Allowance for loan losses, Collectively evaluated for impairment	534		396	490
Loans:
Total Loans	48,948		33,941	45,867
Losses, Individually evaluated for impairment	398		874	327
Losses, Collectively evaluated for impairment	48,550		33,067	45,540
Real estate loans | Secured by 1-4 Family Residential
Allowance for loan losses:
Beginning Balance	895		775	775
Charge-offs	(49)		(2)	(55)
Recoveries	2		3	13
Provision for (recovery of) loan losses	(82)		2	162
Ending Balance	766		778	895
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	23		0	172
Allowance for loan losses, Collectively evaluated for impairment	743		778	723
Loans:
Total Loans	217,527		208,338	215,945
Losses, Individually evaluated for impairment	990		1,332	663
Losses, Collectively evaluated for impairment	216,537		207,006	215,282
Real estate loans | Other Real Estate
Allowance for loan losses:
Beginning Balance	2,160		2,948	2,948
Charge-offs	0		0	0
Recoveries	0		1	5
Provision for (recovery of) loan losses	115		18	(793)
Ending Balance	2,275		2,967	2,160
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	35		0	0
Allowance for loan losses, Collectively evaluated for impairment	2,240		2,967	2,160
Loans:
Total Loans	221,396		222,352	219,553
Losses, Individually evaluated for impairment	787		1,263	2,249
Losses, Collectively evaluated for impairment	220,609		221,089	217,304
Commercial and industrial loans
Allowance for loan losses:
Beginning Balance	464		418	418
Charge-offs	0		(8)	(10)
Recoveries	2		1	8
Provision for (recovery of) loan losses	26		40	48
Ending Balance	492		451	464
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	0		0	0
Allowance for loan losses, Collectively evaluated for impairment	492		451	464
Loans:
Total Loans	46,045		39,253	44,605
Losses, Individually evaluated for impairment	0		61	197
Losses, Collectively evaluated for impairment	46,045		39,192	44,408
Consumer and other loans
Allowance for loan losses:
Beginning Balance	929		771	771
Charge-offs	(179)		(196)	(1,104)
Recoveries	111		47	226
Provision for (recovery of) loan losses	(53)		58	1,036
Ending Balance	808		680	929
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	0		0	0
Allowance for loan losses, Collectively evaluated for impairment	808		680	929
Loans:
Total Loans	16,559		17,052	16,886
Losses, Individually evaluated for impairment	0		0	0
Losses, Collectively evaluated for impairment	$ 16,559		$ 17,052	$ 16,886
[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 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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