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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Other Commitments [Line Items]
Outstanding loan commitments	$ 274.3		$ 283.2
Cancellable amounts	110.6		108.4
Outstanding stand-by letters of credit	11.3		12.5
Credit losses for unfunded commitments	0.0	$ 1.0
Future commitments outstanding related to investments	6.2
Mortgage Servicing Rights Assets [Member]
Other Commitments [Line Items]
Reserve	1.7		1.8
Other Liabilities [Member]
Other Commitments [Line Items]
Reserves for unfunded commitments to borrowers	$ 0.9		$ 0.9

X

- Definition

Cancellable amounts

+ References

No definition available.

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Balance Type:	debit
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X

- Definition

Credit losses for unfunded commitments.

+ References

No definition available.

+ Details

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X

- Definition

Future commitments outstanding related to investments.

+ References

No definition available.

+ Details

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- Definition

Outstanding loan commitments.

+ References

No definition available.

+ Details

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- Definition

Reserve.

+ References

No definition available.

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Namespace Prefix:	brbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Reserves for unfunded commitments to borrowers.

+ References

No definition available.

+ Details

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X

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

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- 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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- Details

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- Details

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