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Note 7 - Fair Value - Quantitative Information for Financial Instruments on Non-recurring Basis (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Other real estate owned	$ 468
Other real estate owned	10.0
One-to-Four Family Residential Real Estate [Member] | Fair Value, Nonrecurring [Member]
Other foreclosed assets	$ 387
One-to-Four Family Residential Real Estate [Member] | Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Other foreclosed assets	$ 387
One-to-Four Family Residential Real Estate [Member] | Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member]
Other foreclosed assets	6.2

X

- Definition

Represents fair value of foreclosed assets.

+ References

No definition available.

+ Details

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

X

- Definition

Represents measurement input for foreclosed assets.

+ References

No definition available.

+ Details

Name:	bfin_ForeclosedAssetsMeasurementInput
Namespace Prefix:	bfin_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Value of input used to measure other real estate owned.

+ References

No definition available.

+ Details

Name:	bfin_OtherRealEstateMeasurementInput
Namespace Prefix:	bfin_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The fair value portion on other real estate owned.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: