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Note 7 - Fair Value - Quantitative Information for Financial Instruments on Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] $ in Thousands	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
One-to-Four Family Residential Real Estate [Member]
Foreclosed assets	$ 694	$ 725
One-to-Four Family Residential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Foreclosed assets	$ 694	$ 725
One-to-Four Family Residential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member]
Foreclosed assets	7.6	15.6
Nonresidential Real Estate [Member] | Real Estate Portfolio [Member]
Impaired loans - nonresidential real estate, fair value		$ 267
Nonresidential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] | Real Estate Portfolio [Member]
Impaired loans - nonresidential real estate, fair value		$ 267
Nonresidential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member] | Real Estate Portfolio [Member]
Imapired loans, measurement input		22.0

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

Fair value portion of impaired financing receivable.

+ References

No definition available.

+ Details

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

X

- Definition

Value of input used to measure impaired financing receivable.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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- Details

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- Details

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- Details

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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bfin_NonresidentialRealEstateMember
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- Details

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