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Loans - Analysis of the Credit Risk Profile of Each Loan Class (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 539,821	$ 522,201	$ 514,707
Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	533,148	507,176
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,718	5,225
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,955	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	42,982	35,927	37,182
Real estate loans | Secured by 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	211,938	208,177	203,896
Real estate loans | Other real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	224,903	222,256	222,154
Real estate loans | Pass | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	41,818	31,553
Real estate loans | Pass | Secured by 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	210,150	204,166
Real estate loans | Pass | Other real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	221,476	215,773
Real estate loans | Special Mention | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	481	2,268
Real estate loans | Special Mention | Secured by 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,079	1,933
Real estate loans | Special Mention | Other real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,135	971
Real estate loans | Substandard | Construction and land development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	683	2,106
Real estate loans | Substandard | Secured by 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	709	2,078
Real estate loans | Substandard | Other real estate loans
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,292	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	42,861	38,763	34,447
Commercial and industrial loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	42,567	38,606
Commercial and industrial loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total Loans	23	53
Commercial and industrial loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total Loans	271	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	17,137	17,078	$ 17,028
Consumer and other loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total Loans	17,137	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

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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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