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Allowance for Loan Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Allowance for loan losses:
Beginning balance	$ 5,321	$ 5,524
Charge-offs	(733)	(788)
Recoveries	638	585
Provision for (recovery of) loan losses	100	0
Ending balance	5,326	5,321
Ending Balance:
Individually evaluated for impairment	0	37
Collectively evaluated for impairment	5,326	5,284
Loans:
Total Loans	522,201	486,067
Individually evaluated for impairment	3,811	4,860
Collectively evaluated for impairment	518,390	481,207
Real estate loans | Construction and land development
Allowance for loan losses:
Beginning balance	441	1,532
Charge-offs	0	0
Recoveries	11	4
Provision for (recovery of) loan losses	(38)	(1,095)
Ending balance	414	441
Ending Balance:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	414	441
Loans:
Total Loans	35,927	34,699
Individually evaluated for impairment	1,150	1,973
Collectively evaluated for impairment	34,777	32,726
Real estate loans | Secured by 1-4 family residential
Allowance for loan losses:
Beginning balance	1,019	939
Charge-offs	(126)	(83)
Recoveries	302	293
Provision for (recovery of) loan losses	(420)	(130)
Ending balance	775	1,019
Ending Balance:
Individually evaluated for impairment	0	37
Collectively evaluated for impairment	775	982
Loans:
Total Loans	208,177	198,763
Individually evaluated for impairment	1,307	1,828
Collectively evaluated for impairment	206,870	196,935
Real estate loans | Other real estate
Allowance for loan losses:
Beginning balance	3,142	2,534
Charge-offs	0	(165)
Recoveries	50	2
Provision for (recovery of) loan losses	(244)	771
Ending balance	2,948	3,142
Ending Balance:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	2,948	3,142
Loans:
Total Loans	222,256	211,210
Individually evaluated for impairment	1,289	984
Collectively evaluated for impairment	220,967	210,226
Commercial and industrial loans
Allowance for loan losses:
Beginning balance	380	306
Charge-offs	0	0
Recoveries	10	11
Provision for (recovery of) loan losses	28	63
Ending balance	418	380
Ending Balance:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	418	380
Loans:
Total Loans	38,763	29,981
Individually evaluated for impairment	65	75
Collectively evaluated for impairment	38,698	29,906
Consumer and other loans
Allowance for loan losses:
Beginning balance	339	213
Charge-offs	(607)	(540)
Recoveries	265	275
Provision for (recovery of) loan losses	774	391
Ending balance	771	339
Ending Balance:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	771	339
Loans:
Total Loans	17,078	11,414
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	$ 17,078	$ 11,414

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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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