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Business Combinations - Summary of Purchased Performing and PCI Loans Receivable (Detail) - Bay Banks [Member] $ in Thousands | Jan. 31, 2021 USD ($)
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Business Acquisition [Line Items] |
Principal payments receivable | $ 1,048,289
Fair value adjustment - credit and interest | (17,856)
Fair value of acquired loans | 1,030,433
Purchased Performing [Member] |
Business Acquisition [Line Items] |
Principal payments receivable | 936,523
Fair value adjustment - credit and interest | (2,784)
Fair value of acquired loans | 933,739
PCI [Member] |
Business Acquisition [Line Items] |
Principal payments receivable | 111,766
Fair value adjustment - credit and interest | (15,072)
Fair value of acquired loans | $ 96,694

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- Definition Business combination fair value adjustment credit and interest. + References No definition available. + Details
Name: | brbs_BusinessCombinationFairValueAdjustmentCreditAndInterest
Namespace Prefix: | brbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Business combination principal payments receivable. + References No definition available. + Details
Name: | brbs_BusinessCombinationPrincipalPaymentsReceivable
Namespace Prefix: | brbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=brbs_BayBanksOfVirginiaIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=brbs_PurchasedPerformingLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=brbs_PurchasedCreditImpairedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |