Adjustment to regulatory capital

No definition available.

Name:	brbs_AdjustmentToRegulatoryCapital
Namespace Prefix:	brbs_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Banking regulation capital transitional amount.

+ References

No definition available.

+ Details

Name:	brbs_BankingRegulationCapitalTransitionalAmount
Namespace Prefix:	brbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Banking regulation capital transitional amount substracted.

+ References

No definition available.

+ Details

Name:	brbs_BankingRegulationCapitalTransitionalAmountSubstracted
Namespace Prefix:	brbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Risk weighted assets capital conservation buffer.

+ References

No definition available.

+ Details

Name:	brbs_RiskWeightedAssetsCapitalConservationBuffer
Namespace Prefix:	brbs_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Minimum capital conservation buffer percentage required to avoid restriction on payout amount of eligible retained income as defined by regulatory framework.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

+ Details

Name:	us-gaap_BankingRegulationCapitalConservationBufferCapitalConservedMinimum
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Minimum leverage buffer percentage as defined by regulatory framework.

+ References

+ Details

Name:	us-gaap_BankingRegulationLeverageBufferMinimum
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- 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/2009/role/commonPracticeRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

+ Details

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

- Details

Name:	us-gaap_StatementEquityComponentsAxis=brbs_CeclAdjustmentToRegulatoryCapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=brbs_CommonEquityTierOneCapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Minimum Regulatory Capital Requirements - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Leverage ratio	0.10
Capital ratio	0.13
Banking regulation capital transitional amount	$ 8.1
Banking regulation capital transitional amount substracted	$ 6.1	$ 4.1
CECL Adjustment to Regulatory Capital [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Adjustment to regulatory capital	25.00%	50.00%	25.00%
Common Equity Tier 1 Capital [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Capital conservation buffer	2.50%