Loans Receivable and ACL-Loans - Schedule of Individually Evaluated Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Individually evaluated loans without a valuation allowance:
Carrying Amount	$ 70,141	$ 78,933
Unpaid Principal Balance	80,988	89,670
Individually evaluated loans with a valuation allowance:
Carrying Amount	0	0
Unpaid Principal Balance	0	0
Total individually evaluated loans
Carrying Amount	70,141	78,933
Unpaid Principal Balance	80,988	89,670
Associated ACL-Loans	0	0
Residential Real Estate
Individually evaluated loans without a valuation allowance:
Carrying Amount	2,719	2,751
Unpaid Principal Balance	3,076	3,098
Individually evaluated loans with a valuation allowance:
Carrying Amount	0	0
Unpaid Principal Balance	0	0
Total individually evaluated loans
Associated ACL-Loans	0	0
Commercial Real Estate
Individually evaluated loans without a valuation allowance:
Carrying Amount	40,095	35,767
Unpaid Principal Balance	49,873	45,462
Individually evaluated loans with a valuation allowance:
Carrying Amount	0	0
Unpaid Principal Balance	0	0
Total individually evaluated loans
Associated ACL-Loans	0	0
Construction
Individually evaluated loans without a valuation allowance:
Carrying Amount	0	0
Unpaid Principal Balance	0	0
Individually evaluated loans with a valuation allowance:
Carrying Amount	0	0
Unpaid Principal Balance	0	0
Total individually evaluated loans
Associated ACL-Loans	0	0
Commercial business
Individually evaluated loans without a valuation allowance:
Carrying Amount	1,665	1,595
Unpaid Principal Balance	2,377	2,290
Individually evaluated loans with a valuation allowance:
Carrying Amount	0	0
Unpaid Principal Balance	0	0
Total individually evaluated loans
Associated ACL-Loans	0	0
Consumer
Individually evaluated loans without a valuation allowance:
Carrying Amount	25,662	38,820
Unpaid Principal Balance	25,662	38,820
Individually evaluated loans with a valuation allowance:
Carrying Amount	0	0
Unpaid Principal Balance	0	0
Total individually evaluated loans
Associated ACL-Loans	$ 0	$ 0

Financing Receivable, Individually Evaluated Recorded Investment

No definition available.

Name:	bwfg_FinancingReceivableIndividuallyEvaluatedRecordedInvestment
Namespace Prefix:	bwfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable, Individually Evaluated Related Allowance

+ References

No definition available.

+ Details

Name:	bwfg_FinancingReceivableIndividuallyEvaluatedRelatedAllowance
Namespace Prefix:	bwfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable, Individually Evaluated Unpaid Principal Balance

+ References

No definition available.

+ Details

Name:	bwfg_FinancingReceivableIndividuallyEvaluatedUnpaidPrincipalBalance
Namespace Prefix:	bwfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable, with No Related Allowance, Carrying Value

+ References

No definition available.

+ Details

Name:	bwfg_FinancingReceivableWithNoRelatedAllowanceCarryingValue
Namespace Prefix:	bwfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable, with No Related Allowance, Individually Evaluated Unpaid Principal Balance

+ References

No definition available.

+ Details

Name:	bwfg_FinancingReceivableWithNoRelatedAllowanceIndividuallyEvaluatedUnpaidPrincipalBalance
Namespace Prefix:	bwfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable, with Related Allowance, Individually Evaluated Recorded Investment

+ References

No definition available.

+ Details

Name:	bwfg_FinancingReceivableWithRelatedAllowanceIndividuallyEvaluatedRecordedInvestment
Namespace Prefix:	bwfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable, with Related Allowance, Individually Evaluated Unpaid Principal Balance

+ References

No definition available.

+ Details

Name:	bwfg_FinancingReceivableWithRelatedAllowanceIndividuallyEvaluatedUnpaidPrincipalBalance
Namespace Prefix:	bwfg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- 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: