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

X

- Definition

Other real estate owned fair value disclosures.

+ References

No definition available.

+ Details

Name:	brbs_OtherRealEstateOwnedFairValueDisclosure
Namespace Prefix:	brbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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