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Loans - Analysis of the Credit Risk Profile of Each Loan Class (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Total	$ 497,770	$ 486,067	$ 454,076
Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	36,024	34,699	31,505
Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	205,623	198,763	196,165
Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	216,591	211,210
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	29,192	29,981	24,215
Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	10,340	11,414	$ 10,885
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	475,402	463,690
Pass [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	30,522	29,416
Pass [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	200,347	193,395
Pass [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	205,504	200,009
Pass [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	28,689	29,456
Pass [Member] | Consumer and Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	10,340	11,414
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	12,896	13,073
Special Mention [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,267	2,402
Special Mention [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,319	3,295
Special Mention [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	6,933	6,990
Special Mention [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	377	386
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	9,472	9,304
Substandard [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,235	2,881
Substandard [Member] | Secured by 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,957	2,073
Substandard [Member] | Other Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	4,154	4,211
Substandard [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 126	$ 139

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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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