Name:	brbs_AssumptionForFairValueOfAssetsOrLiabilitiesThatRelateToTransferorSContinuingInvolvementEstimatedBaseAnnualServicingCostsPerLoan
Namespace Prefix:	brbs_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	duration

Assumption for fair value of assets or liabilities that relate to transferor's continuing involvement weighted average discount rate.

No definition available.

Name:	brbs_AssumptionForFairValueOfAssetsOrLiabilitiesThatRelateToTransferorSContinuingInvolvementWeightedAverageDiscountRate
Namespace Prefix:	brbs_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Assumption for fair value of assets or liabilities that relate to transferor's continuing involvement weighted average net servicing fee income basis points.

No definition available.

Name:	brbs_AssumptionForFairValueOfAssetsOrLiabilitiesThatRelateToTransferorSContinuingInvolvementWeightedAverageNetServicingFeeIncomeBasisPoints
Namespace Prefix:	brbs_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Purchase Price

No definition available.

Name:	brbs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasePrice
Namespace Prefix:	brbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Discount rate which is used to value residual cash flows generated by financial assets of a securitization, asset-backed financing arrangement, or similar transfer regardless of when the transfer occurred.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

Name:	us-gaap_AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Estimated rate of prepayment of principal on financial assets regardless of when the transfer occurred.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

Name:	us-gaap_AssumptionForFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesPrepaymentSpeed
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

Name:	us-gaap_ServicingAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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.

No definition available.

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

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_FinancialInstrumentAxis=brbs_ThirteenCorporateBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: