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Loans - Analysis of the Credit Risk Profile of Each Loan Class (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Total	$ 542,856	$ 522,201
Pass
Financing Receivable, Recorded Investment [Line Items]
Total	534,083	507,176
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	2,078	5,225
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	6,695	9,800
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Real estate loans | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total	45,867	35,927
Real estate loans | Construction and land development | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	45,054	31,553
Real estate loans | Construction and land development | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	235	2,268
Real estate loans | Construction and land development | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	578	2,106
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	215,945	208,177
Real estate loans | Secured by 1-4 family residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	214,089	204,166
Real estate loans | Secured by 1-4 family residential | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	924	1,933
Real estate loans | Secured by 1-4 family residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	932	2,078
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	219,553	222,256
Real estate loans | Other real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	213,681	215,773
Real estate loans | Other real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	900	971
Real estate loans | Other real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	4,972	5,512
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	44,605	38,763
Commercial and industrial loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	44,373	38,606
Commercial and industrial loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total	19	53
Commercial and industrial loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total	213	104
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	16,886	17,078
Consumer and other loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total	16,886	17,078
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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