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Loans - Analysis of the Credit Risk Profile of Each Loan Class (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Financing Receivable, Recorded Investment [Line Items]
Total	$ 470,834	$ 438,999	$ 406,413
Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	34,518	33,135	29,935
Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	196,492	189,286	179,419
Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	202,843	181,447
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	25,851	24,048	19,950
Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	11,130	11,083	$ 11,448
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	444,992	408,710
Pass [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	28,115	26,371
Pass [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	190,915	182,595
Pass [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	189,522	165,310
Pass [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	25,310	23,351
Pass [Member] | Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	11,130	11,083
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	14,238	16,372
Special Mention [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,543	2,587
Special Mention [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,242	3,376
Special Mention [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	8,060	9,977
Special Mention [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	393	432
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	11,604	13,917
Substandard [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,860	4,177
Substandard [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,335	3,315
Substandard [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,261	6,160
Substandard [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 148	$ 265

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+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

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