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v3.21.1

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

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- 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

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- 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

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