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Subsequent Events - Additional Information (Detail) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Oct. 31, 2024 | Sep. 30, 2024 | Sep. 30, 2023
Subsequent Event [Line Items] |  |  |
Loss on sale of MSRs |  | $ (1,011) | $ 0
Cash payments received |  |  | $ 4,500
Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Sale of mortgage servicing rights | $ 1,510,000 |  |
Loss on sale of MSRs | $ 1,600 |  |

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- Definition Cash payments received + References No definition available. + Details
Name: | brbs_CashPaymentsReceived
Namespace Prefix: | brbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Loss on sale of MSRs. + References No definition available. + Details
Name: | brbs_LossOnSaleOfMsrs
Namespace Prefix: | brbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Sale of mortgage servicing rights. + References No definition available. + Details
Name: | brbs_SaleOfMortgageServicingRightsMsr
Namespace Prefix: | brbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 855 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483399/855-10-50-2 + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |