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Minimum Regulatory Capital - Additional Information (Detail)	Mar. 31, 2021
Common Equity Tier One Capital
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Capital conservation buffer	2.50%

X

- Definition

Risk weighted assets capital conservation buffer.

+ References

No definition available.

+ Details

Name:	brbs_RiskWeightedAssetsCapitalConservationBuffer
Namespace Prefix:	brbs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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

No definition available.

+ Details

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

X

- Details

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