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Derivatives - Additional Information (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Derivative [Line Items] |  |  |
Notional Amount | $ 29,200 | $ 64,800 |
Derivative assets held for sale | 22,400 | 113,600 |
Mortgage derivative asset | 937 | 1,876 | [1]
Mortgage derivative liabilities including in other liabilities | 30 | 75 |
Hedged Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative assets held for sale | $ 48,500 | $ 169,500 |
[1] | Derived from audited December 31, 2021 Consolidated Financial Statements.

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- Definition Mortgage derivative asset. + References No definition available. + Details
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Namespace Prefix: | brbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Mortgage derivative liability. + References No definition available. + Details
Name: | brbs_MortgageDerivativeLiability
Namespace Prefix: | brbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying amount as of the balance sheet date of the asset arising from derivative instruments and hedging activities, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |