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Commitments, Contingencies and Credit Risk (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Commitments Outstanding |  |
Unfunded Commitments Under Lines of Credit | $ 518,267 | $ 546,632
Letters of Credit | 106,484 | 103,289
Totals | 624,751 | 649,921
Federal Home Loan Bank Advances |  |
Commitments Outstanding |  |
Outstanding letters of credit | $ 164,200 | $ 114,400

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: |