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Loans - Analysis of the Credit Risk Profile of Each Loan Class (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 530,933	$ 522,201	$ 503,833
Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	520,817	507,176
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,988	5,225
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,128	9,800
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Real estate loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	37,350	35,927	36,783
Real estate loans | Secured by 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	211,101	208,177	205,114
Real estate loans | Other real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	224,362	222,256	215,742
Real estate loans | Pass | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	34,862	31,553
Real estate loans | Pass | Secured by 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	207,451	204,166
Real estate loans | Pass | Other real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	220,695	215,773
Real estate loans | Special Mention | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	751	2,268
Real estate loans | Special Mention | Secured by 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,896	1,933
Real estate loans | Special Mention | Other real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,314	971
Real estate loans | Substandard | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,737	2,106
Real estate loans | Substandard | Secured by 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,754	2,078
Real estate loans | Substandard | Other real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,353	5,512
Real estate loans | Doubtful | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Real estate loans | Doubtful | Secured by 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Real estate loans | Doubtful | Other real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Commercial and industrial loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	40,943	38,763	31,201
Commercial and industrial loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	40,632	38,606
Commercial and industrial loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	27	53
Commercial and industrial loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	284	104
Commercial and industrial loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Consumer and other loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	17,177	17,078	$ 14,993
Consumer and other loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	17,177	17,078
Consumer and other loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Consumer and other loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Consumer and other loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 0	$ 0

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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=82891408&loc=d3e4428-111522

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