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Organization and Basis of Presentation - Schedule of Information Pertaining to Warrants to Purchase Common Stock (Parenthetical) (Detail) - Private Placement [Member] - shares	3 Months Ended	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2025
Class of Warrant or Right [Line Items]
Warrants exercised during the period		(3,903,000)
Common Stock [Member]
Class of Warrant or Right [Line Items]
Warrants exercised during the period	125,000

X

- Definition

Stock issued during period shares warrants exercised.

+ References

No definition available.

+ Details

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Namespace Prefix:	brbs_
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Balance Type:	na
Period Type:	duration

X

- 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
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: