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Loans - Analysis of the Credit Risk Profile of Each Loan Class (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 503,833	$ 486,067	$ 465,546
Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	36,783	34,699	33,232
Secured by 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	205,114	198,763	196,295
Other real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	215,742	211,210
Commercial and industrial loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	31,201	29,981	24,721
Consumer and Other Loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	14,993	11,414	$ 11,136
Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	482,247	463,690
Pass | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	31,272	29,416
Pass | Secured by 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	200,446	193,395
Pass | Other real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	204,820	200,009
Pass | Commercial and industrial loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	30,716	29,456
Pass | Consumer and Other Loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	14,993	11,414
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	10,378	13,073
Special Mention | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,556	2,402
Special Mention | Secured by 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,388	3,295
Special Mention | Other real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	5,066	6,990
Special Mention | Commercial and industrial loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	368	386
Special Mention | Consumer and Other Loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	11,208	9,304
Substandard | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,955	2,881
Substandard | Secured by 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,280	2,073
Substandard | Other real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	5,856	4,211
Substandard | Commercial and industrial loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	117	139
Substandard | Consumer and Other Loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Doubtful | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Doubtful | Secured by 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Doubtful | Other real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Doubtful | Commercial and industrial loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Doubtful | Consumer and Other Loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 0	$ 0

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+ References

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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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