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Loans - Analysis of the Credit Risk Profile of Each Loan Class (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Total	$ 454,076	$ 438,999	$ 398,517
Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	31,505	33,135	33,344
Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	196,165	189,286	172,874
Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	191,306	181,447
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	24,215	24,048	21,420
Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	10,885	11,083	$ 11,983
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	426,151	408,710
Pass [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	25,288	26,371
Pass [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	190,069	182,595
Pass [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	176,371	165,310
Pass [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	23,538	23,351
Pass [Member] | Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	10,885	11,083
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	13,796	16,372
Special Mention [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,139	2,587
Special Mention [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,843	3,376
Special Mention [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	8,393	9,977
Special Mention [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	421	432
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	14,129	13,917
Substandard [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	4,078	4,177
Substandard [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,253	3,315
Substandard [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	6,542	6,160
Substandard [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 256	$ 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=28367877&loc=d3e4428-111522

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