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Note 4 - Loans Receivable - COVID Loan Forbearance Program (Details) $ in Thousands	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Number of loans originated	11	30
Principal balance	$ 4,481	$ 10,337
Principal Amount Deferred	$ 14	$ 53
Multi-family Mortgage [Member] | COVID 19 [Member] | Small Investment Property Forbearance Agreement [Member]
Number of loans originated	1	8
Principal balance	$ 564	$ 3,092
Principal Amount Deferred	$ 2	$ 17
Nonresidential Real Estate [Member] | COVID 19 [Member] | Small Investment Property Forbearance Agreement [Member]
Number of loans originated	4	10
Principal balance	$ 1,155	$ 3,363
Principal Amount Deferred	$ 4	$ 22
Nonresidential Real Estate [Member] | COVID 19 [Member] | Standard Forbearance Agreement [Member]
Number of loans originated	1	2
Principal balance	$ 1,981	$ 2,480
Principal Amount Deferred	$ 6	$ 6
One-to-Four Family Residential Real Estate [Member] | COVID 19 [Member] | Standard Forbearance Agreement [Member]
Number of loans originated	5	10
Principal balance		$ 1,402
Principal Amount Deferred	$ 2	$ 8
One To Four Family Residential Real Estate Loans [Member] | COVID 19 [Member] | Standard Forbearance Agreement [Member]
Principal balance	$ 781

X

- Definition

Represents number of loans under financing receivable.

+ References

No definition available.

+ Details

Name:	bfin_FinancingReceivableNumberOfLoans
Namespace Prefix:	bfin_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents principal balance of financing receivable.

+ References

No definition available.

+ Details

Name:	bfin_FinancingReceivablePrincipalBalance
Namespace Prefix:	bfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Deferred amounts of principal only payments on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19.

+ References

No definition available.

+ Details

Name:	bfin_FinancingReceivablePrincipalOnlyDeferredPayments
Namespace Prefix:	bfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bfin_MultifamilyMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=bfin_Covid19Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=bfin_SmallInvestmentPropertyForbearanceAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bfin_NonresidentialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=bfin_StandardForbearanceAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bfin_OnetoFourFamilyResidentialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bfin_OneToFourFamilyResidentialRealEstateLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: