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Commitments, Contingencies and Credit Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Commitments Outstanding
Unfunded Commitments Under Lines of Credit	$ 546,632	$ 848,734
Letters of Credit	103,289	115,769
Totals	649,921	964,503
Federal Home Loan Bank Advances
Commitments Outstanding
Outstanding letters of credit	$ 114,400	$ 78,400

X

- Definition

The amount of credit risk associated with the commitment to extent the credit.

+ References

No definition available.

+ Details

Name:	bwb_CreditRiskOfCommitmentsToExtendCredit
Namespace Prefix:	bwb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of credit risk associated with the commitment letters of credit.

+ References

No definition available.

+ Details

Name:	bwb_CreditRiskOfLettersOfCredit
Namespace Prefix:	bwb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of credit risk associated with the unfunded commitments under lines of credit.

+ References

No definition available.

+ Details

Name:	bwb_CreditRiskOfUnfundedCommitmentsLinesOfCredit
Namespace Prefix:	bwb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

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

X

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_FederalHomeLoanBankAdvancesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: