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Loans and Allowance for Loan Losses - Summary of Loan Portfolio Individually and Collectively Evaluated for Impairment (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Gross loans, excluding PPP loans	$ 703,230	$ 647,572
Less: Unearned income and deferred costs	(4,271)	(738)
Total, excluding PPP loans	698,959	646,834
Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans, excluding PPP loans	93,286	77,728
Construction, Commercial [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans, excluding PPP loans	54,702	38,039
Construction, Residential [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans, excluding PPP loans	18,040	26,778
Mortgage, Commercial [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans, excluding PPP loans	273,499	251,824
Mortgage, Residential [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans, excluding PPP loans	213,404	208,494
Mortgage, Farmland [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans, excluding PPP loans	3,615	5,507
Consumer Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans, excluding PPP loans	46,684	39,202
Individually Evaluated for Impairment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans, excluding PPP loans	2,331	1,408
Total, excluding PPP loans	2,331	1,408
Individually Evaluated for Impairment [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans, excluding PPP loans	234	280
Individually Evaluated for Impairment [Member] | Mortgage, Commercial [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans, excluding PPP loans	1,645	733
Individually Evaluated for Impairment [Member] | Mortgage, Residential [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans, excluding PPP loans	452	395
Collectively Evaluated for Impairment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans, excluding PPP loans	700,899	646,164
Less: Unearned income and deferred costs	(4,271)	(738)
Total, excluding PPP loans	696,628	645,426
Collectively Evaluated for Impairment [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans, excluding PPP loans	93,052	77,448
Collectively Evaluated for Impairment [Member] | Construction, Commercial [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans, excluding PPP loans	54,702	38,039
Collectively Evaluated for Impairment [Member] | Construction, Residential [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans, excluding PPP loans	18,040	26,778
Collectively Evaluated for Impairment [Member] | Mortgage, Commercial [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans, excluding PPP loans	271,854	251,091
Collectively Evaluated for Impairment [Member] | Mortgage, Residential [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans, excluding PPP loans	212,952	208,099
Collectively Evaluated for Impairment [Member] | Mortgage, Farmland [Member] | Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans, excluding PPP loans	3,615	5,507
Collectively Evaluated for Impairment [Member] | Consumer Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Gross loans, excluding PPP loans	$ 46,684	$ 39,202

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Loans and leases receivable, gross, excluding PPP loans.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=121568338&loc=d3e45377-112738

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 310
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159169&loc=d3e10152-111534

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