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Loans - Analysis of the Credit Risk Profile of Each Loan Class (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Financing Receivable, Recorded Investment [Line Items]
Total	$ 465,546	$ 438,999	$ 391,721
Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	33,232	33,135	32,009
Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	196,295	189,286	173,265
Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	200,162	181,447
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	24,721	24,048	19,319
Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	11,136	11,083	$ 11,732
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	438,681	408,710
Pass [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	27,121	26,371
Pass [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	190,518	182,595
Pass [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	185,740	165,310
Pass [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	24,166	23,351
Pass [Member] | Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	11,136	11,083
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	13,392	16,372
Special Mention [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,095	2,587
Special Mention [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,566	3,376
Special Mention [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	8,330	9,977
Special Mention [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	401	432
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	13,473	13,917
Substandard [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	4,016	4,177
Substandard [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,211	3,315
Substandard [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	6,092	6,160
Substandard [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 154	$ 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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