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Organization and Basis of Presentation - Schedule of Information Pertaining to Warrants to Purchase Common Stock (Detail) - Private Placement [Member] - shares	9 Months Ended
	Sep. 30, 2025
Class of Warrant or Right [Line Items]
Warrants outstanding at beginning of period	31,451,999
Warrants exercised during the period	(3,903,000)
Warrants outstanding at end of period	27,548,999
Warrants Issued April 3, 2024 [Member]
Class of Warrant or Right [Line Items]
Warrants outstanding at beginning of period	29,027,999
Warrants exercised during the period	(3,903,000)
Warrants outstanding at end of period	25,124,999
Remaining exercise term (years)	3 years 6 months 3 days
Warrants Issued June 13, 2024 [Member]
Class of Warrant or Right [Line Items]
Warrants outstanding at beginning of period	2,424,000
Warrants exercised during the period	0
Warrants outstanding at end of period	2,424,000
Remaining exercise term (years)	3 years 8 months 12 days

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
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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
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X

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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- Details

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Namespace Prefix:
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- Details

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- Details

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