Loans Receivable and ACL-Loans - Schedule of Portfolio Segment and Impairment Methodology, of the ACL-Loan and Related Portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, portfolio	$ 70,141	$ 78,933
Loans individually evaluated for impairment, allowance	0	0
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, portfolio	2,796,477	2,761,139
Loans collectively evaluated for impairment, allowance	29,580	30,705
Portfolio	2,866,618	2,840,072
ACL-Loans	29,580	30,705	$ 29,485	$ 29,007
Residential Real Estate
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, portfolio	2,719	2,751
Loans individually evaluated for impairment, allowance	0	0
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, portfolio	27,409	30,388
Loans collectively evaluated for impairment, allowance	48	55
Portfolio	30,128	33,139
ACL-Loans	48	55	87	94
Commercial Real Estate
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, portfolio	40,095	35,767
Loans individually evaluated for impairment, allowance	0	0
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, portfolio	1,856,470	1,895,212
Loans collectively evaluated for impairment, allowance	18,588	20,255
Portfolio	1,896,565	1,930,979
ACL-Loans	18,588	20,255	20,562	21,838
Construction
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, portfolio	0	0
Loans individually evaluated for impairment, allowance	0	0
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, portfolio	155,826	153,778
Loans collectively evaluated for impairment, allowance	1,912	2,251
Portfolio	155,826	153,778
ACL-Loans	1,912	2,251	2,216	2,059
Commercial business
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, portfolio	1,665	1,595
Loans individually evaluated for impairment, allowance	0	0
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, portfolio	721,607	643,726
Loans collectively evaluated for impairment, allowance	7,706	6,635
Portfolio	723,272	645,321
ACL-Loans	7,706	6,635	5,244	4,070
Consumer
Loans individually evaluated for impairment:
Loans individually evaluated for impairment, portfolio	25,662	38,820
Loans individually evaluated for impairment, allowance	0	0
Loans collectively evaluated for impairment:
Loans collectively evaluated for impairment, portfolio	35,165	38,035
Loans collectively evaluated for impairment, allowance	1,326	1,509
Portfolio	60,827	76,855
ACL-Loans	$ 1,326	$ 1,509	$ 1,376	$ 946

Financing Receivable Allowance For Credit Loss, Collectively Evaluated for Impairment

No definition available.

Name:	bwfg_FinancingReceivableAllowanceForCreditLossCollectivelyEvaluatedForImpairment
Namespace Prefix:	bwfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Financing Receivable Allowance For Credit Loss, Individually Evaluated for Impairment

+ References

No definition available.

+ Details

Name:	bwfg_FinancingReceivableAllowanceForCreditLossIndividuallyEvaluatedForImpairment
Namespace Prefix:	bwfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	bwfg_LoansCollectivelyEvaluatedForImpairmentAbstract
Namespace Prefix:	bwfg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

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

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

+ Details

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

- Definition

Amount of financing receivable collectively evaluated for credit loss. Excludes financing receivable individually evaluated for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L.5.a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480418/310-10-S99-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11C
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-11C

+ Details

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

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-5

+ Details

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

- Definition

Amount of financing receivable individually evaluated for credit loss. Excludes financing receivable collectively evaluated for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L.5.a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480418/310-10-S99-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11C
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-11C

+ Details

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

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=bwfg_ConstructionPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: