XML 137 R117.htm IDEA: XBRL DOCUMENT v3.25.0.1

Fair Value Measurement - Nonrecurring (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Balances of the assets and liabilities measured at fair value on a nonrecurring basis
Loss	$ 2,900	$ 2,050	$ 7,700
Nonrecurring
Balances of the assets and liabilities measured at fair value on a nonrecurring basis
Loss	44	199	71
Nonrecurring | Individually Evaluated Loans
Balances of the assets and liabilities measured at fair value on a nonrecurring basis
Loss	44	199
Nonrecurring | Impaired Loans
Balances of the assets and liabilities measured at fair value on a nonrecurring basis
Loss			71
Level 2 | Nonrecurring
Balances of the assets and liabilities measured at fair value on a nonrecurring basis
Assets measured at fair value			96
Level 2 | Nonrecurring | Impaired Loans
Balances of the assets and liabilities measured at fair value on a nonrecurring basis
Assets measured at fair value			$ 96
Level 3 | Nonrecurring
Balances of the assets and liabilities measured at fair value on a nonrecurring basis
Assets measured at fair value	91	9,602
Level 3 | Nonrecurring | Individually Evaluated Loans
Balances of the assets and liabilities measured at fair value on a nonrecurring basis
Assets measured at fair value	$ 91	$ 9,602
Level 3 | Nonrecurring | Individually Evaluated Loans | Minimum
Balances of the assets and liabilities measured at fair value on a nonrecurring basis
Customized discounting criteria on appraisals (as a percent)	7.00%
Level 3 | Nonrecurring | Individually Evaluated Loans | Maximum
Balances of the assets and liabilities measured at fair value on a nonrecurring basis
Customized discounting criteria on appraisals (as a percent)	10.00%

X

- Definition

The fair value input for estimating collateral value.

+ References

No definition available.

+ Details

Name:	bwb_FairValueAssetsMeasuredOnNonrecurringBasisObservableInputDiscountingCriteriaPercentage
Namespace Prefix:	bwb_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value portion of asset recognized for present right to economic benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of credit loss expense (reversal of expense) for financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(11))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

Name:	us-gaap_ProvisionForLoanLossesExpensed
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=bwb_IndividuallyEvaluatedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=bwb_ImpairedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: