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Allowance for Loan Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended			12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017		Sep. 30, 2016	Dec. 31, 2016
Allowance for loan losses:
Beginning Balance			$ 5,321	[1]	$ 5,524	$ 5,524
Charge-offs			(510)		(451)	(788)
Recoveries			490		537	585
Provision for (recovery of) loan losses	$ 0	$ 0	0		0	0
Ending Balance	5,301	5,610	5,301		5,610	5,321	[1]
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	0	256	0		256	37
Allowance for loan losses, Collectively evaluated for impairment	5,301	5,354	5,301		5,354	5,284
Loans:
Total Loans	514,707	470,834	514,707		470,834	486,067
Loans, Individually evaluated for impairment	4,995	6,913	4,995		6,913	4,860
Loans, Collectively evaluated for impairment	509,712	463,921	509,712		463,921	481,207
Real estate loans | Construction and Land Development
Allowance for loan losses:
Beginning Balance			441		1,532	1,532
Charge-offs			0		0	0
Recoveries			11		4	4
Provision for (recovery of) loan losses			(17)		(1,084)	(1,095)
Ending Balance	435	452	435		452	441
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	0	0	0		0	0
Allowance for loan losses, Collectively evaluated for impairment	435	452	435		452	441
Loans:
Total Loans	37,182	34,518	37,182		34,518	34,699
Loans, Individually evaluated for impairment	1,959	2,749	1,959		2,749	1,973
Loans, Collectively evaluated for impairment	35,223	31,769	35,223		31,769	32,726
Real estate loans | Secured by 1-4 Family Residential
Allowance for loan losses:
Beginning Balance			1,019		939	939
Charge-offs			(125)		(53)	(83)
Recoveries			290		290	293
Provision for (recovery of) loan losses			(422)		(173)	(130)
Ending Balance	762	1,003	762		1,003	1,019
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	0	33	0		33	37
Allowance for loan losses, Collectively evaluated for impairment	762	970	762		970	982
Loans:
Total Loans	203,896	196,492	203,896		196,492	198,763
Loans, Individually evaluated for impairment	1,654	2,094	1,654		2,094	1,828
Loans, Collectively evaluated for impairment	202,242	194,398	202,242		194,398	196,935
Real estate loans | Other Real Estate
Allowance for loan losses:
Beginning Balance			3,142		2,534	2,534
Charge-offs			0		0	(165)
Recoveries			50		1	2
Provision for (recovery of) loan losses			(232)		1,002	771
Ending Balance	2,960	3,537	2,960		3,537	3,142
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	0	223	0		223	0
Allowance for loan losses, Collectively evaluated for impairment	2,960	3,314	2,960		3,314	3,142
Loans:
Total Loans	222,154	202,843	222,154		202,843	211,210
Loans, Individually evaluated for impairment	1,319	1,991	1,319		1,991	984
Loans, Collectively evaluated for impairment	220,835	200,852	220,835		200,852	210,226
Commercial and industrial loans
Allowance for loan losses:
Beginning Balance			380		306	306
Charge-offs			0		0	0
Recoveries			8		10	11
Provision for (recovery of) loan losses			(1)		13	63
Ending Balance	387	329	387		329	380
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	0	0	0		0	0
Allowance for loan losses, Collectively evaluated for impairment	387	329	387		329	380
Loans:
Total Loans	34,447	25,851	34,447		25,851	29,981
Loans, Individually evaluated for impairment	63	79	63		79	75
Loans, Collectively evaluated for impairment	34,384	25,772	34,384		25,772	29,906
Consumer and other loans
Allowance for loan losses:
Beginning Balance			339		213	213
Charge-offs			(385)		(398)	(540)
Recoveries			131		232	275
Provision for (recovery of) loan losses			672		242	391
Ending Balance	757	289	757		289	339
Ending Balance:
Allowance for loan losses, Individually evaluated for impairment	0	0	0		0	0
Allowance for loan losses, Collectively evaluated for impairment	757	289	757		289	339
Loans:
Total Loans	17,028	11,130	17,028		11,130	11,414
Loans, Individually evaluated for impairment	0	0	0		0	0
Loans, Collectively evaluated for impairment	$ 17,028	$ 11,130	$ 17,028		$ 11,130	$ 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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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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