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Subsequent Events - Additional Information (Detail) - USD ($) $ in Millions		6 Months Ended	12 Months Ended
	Mar. 06, 2024	Jun. 30, 2023	Dec. 31, 2023
Subsequent Event [Line Items]
Cash payments received		$ 4.5	$ 3.0
Cash payments			$ 32.8
Subsequent Event [Member]
Subsequent Event [Line Items]
Subsequent Event, Date	Mar. 06, 2024

X

- Definition

Cash payments received

+ References

No definition available.

+ Details

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Namespace Prefix:	brbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481674/830-30-50-2

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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483399/855-10-50-2

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

X

- Definition

Date the event occurred after the balance sheet date but before financial statements are issues or available to be issued, in YYYY-MM-DD format.

+ References

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-Section 50
-Paragraph 2
-Subparagraph (a)
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Period Type:	duration

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- Details

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Namespace Prefix:
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Balance Type:
Period Type: