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Derivatives - Additional Information (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Derivative [Line Items] |  |  |
Interest rate swap asset | $ 5,838 | $ 1,716 | [1]
Interest rate swap liability | 1,239 | 2,735 | [1]
Cash collateral with counterparties | 6,000 | 6,000 |
Derivative assets held for sale | 144,500 | 97,100 |
Mortgage derivative asset | 3,456 | 5,293 | [1]
Mortgage derivative liabilities including in other liabilities | 0 | 1,600 |
Interest Rate Lock Commitments [Member] |  |  |
Derivative [Line Items] |  |  |
Notional Amount | 93,700 | 154,300 |
Hedged Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative assets held for sale | $ 241,600 | $ 225,000 |
Identified Hedge [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed interest rate | 1.80% |  |
New Hedges [Member] | Minimum [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed interest rate | 0.92% |  |
New Hedges [Member] | Maximum [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed interest rate | 0.95% |  |
Additional Hedges [Member] | Minimum [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed interest rate | 0.83% |  |
Additional Hedges [Member] | Maximum [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, fixed interest rate | 0.86% |  |
[1] | Derived from audited December 31, 2020 Consolidated Financial Statements.

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- Definition Interest rate swap asset. + References No definition available. + Details
Name: | brbs_InterestRateSwapAsset
Namespace Prefix: | brbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Interest rate swap liability. + References No definition available. + Details
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Namespace Prefix: | brbs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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
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Namespace Prefix: | brbs_
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Balance Type: | credit
Period Type: | instant

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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624258-113959 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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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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- 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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- 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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