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Loans and ACL - Summary of Accrued Interest Receivable by Loan Type Reversed from Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable, Nonaccrual [Line Items]
Accrued interest receivable reversed through income	$ 148	$ 326
Commercial and Industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Accrued interest receivable reversed through income	57	11
Consumer [Member]
Financing Receivable, Nonaccrual [Line Items]
Accrued interest receivable reversed through income	5	49
Real Estate [Member] | Commercial and Industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Accrued interest receivable reversed through income	25	1
Real Estate [Member] | Commercial [Member]
Financing Receivable, Nonaccrual [Line Items]
Accrued interest receivable reversed through income	51	20
Real Estate [Member] | Residential [Member]
Financing Receivable, Nonaccrual [Line Items]
Accrued interest receivable reversed through income	$ 10	$ 245

X

- Definition

Amount of interest income on financing receivable on nonaccrual status.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-16

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-16

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=brbs_CommercialMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=brbs_ResidentialMortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: