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Loans - Analysis of the Credit Risk Profile of Each Loan Class (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Total	$ 522,201	$ 486,067
Pass
Financing Receivable, Recorded Investment [Line Items]
Total	507,176	463,690
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	5,225	13,073
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	9,800	9,304
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Real estate loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total	35,927	34,699
Real estate loans | Construction and land development | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	31,553	29,416
Real estate loans | Construction and land development | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	2,268	2,402
Real estate loans | Construction and land development | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	2,106	2,881
Real estate loans | Construction and land development | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Real estate loans | Secured by 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Total	208,177	198,763
Real estate loans | Secured by 1-4 family residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	204,166	193,395
Real estate loans | Secured by 1-4 family residential | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	1,933	3,295
Real estate loans | Secured by 1-4 family residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	2,078	2,073
Real estate loans | Secured by 1-4 family residential | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Real estate loans | Other real estate
Financing Receivable, Recorded Investment [Line Items]
Total	222,256	211,210
Real estate loans | Other real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	215,773	200,009
Real estate loans | Other real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	971	6,990
Real estate loans | Other real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	5,512	4,211
Real estate loans | Other real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Commercial and industrial loans
Financing Receivable, Recorded Investment [Line Items]
Total	38,763	29,981
Commercial and industrial loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	38,606	29,456
Commercial and industrial loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	53	386
Commercial and industrial loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	104	139
Commercial and industrial loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Consumer and other loans
Financing Receivable, Recorded Investment [Line Items]
Total	17,078	11,414
Consumer and other loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	17,078	11,414
Consumer and other loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Consumer and other loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Consumer and other loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	$ 0	$ 0

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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=82891408&loc=d3e4428-111522

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