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Goodwill and Intangibles - Schedule of Components of Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Jan. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill	$ 27,098		$ 19,892	[1]
Charlottesville Branch [Member]
Goodwill [Line Items]
Year of acquisition	2011
Goodwill	$ 366		366
River Bancorp, Inc. [Member]
Goodwill [Line Items]
Year of acquisition	2016
Goodwill	$ 1,728		1,728
Mortgage Business [Member]
Goodwill [Line Items]
Year of acquisition	2018
Goodwill	$ 600		600
Hammond Insurance Agency [Member]
Goodwill [Line Items]
Year of acquisition	2019
Goodwill	$ 613		613
Virginia Community Bankshares, Inc. [Member]
Goodwill [Line Items]
Year of acquisition	2019
Goodwill	$ 16,585		$ 16,585
Bay Banks [Member]
Goodwill [Line Items]
Year of acquisition	2021
Goodwill	$ 7,206	$ 7,206
[1] Derived from audited December 31, 2020 Consolidated Financial Statements.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
-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 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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