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Legal Matters - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Dec. 05, 2024 | Dec. 31, 2023 | Sep. 30, 2023
Loss Contingency [Abstract] |  |  |
settlement payment |  | $ 6.0 |
Settlement amount agreed to pay | $ 2.5 |  |
Litigation settlement amount accrued |  |  | $ 6.0

X
- Definition Litigation settlement amount accrued + References No definition available. + Details
Name: | brbs_LitigationSettlementAmountAccrued
Namespace Prefix: | brbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount awarded to other party in judgment or settlement of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_LossContingencyAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 25 -Subparagraph (g) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-25 + Details
Name: | us-gaap_PaymentsForLegalSettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration