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Fair Value - Additional Information (Detail) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
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Fair Value Disclosures [Abstract] |  |
Other real estate owned fair value disclosure | $ 0 | $ 0

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- Definition Other real estate owned fair value disclosures. + 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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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration