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Note 7 - Fair Value (Details Textual) - USD ($)	1 Months Ended	3 Months Ended					9 Months Ended
	Jan. 31, 2023	Sep. 30, 2023		Jun. 30, 2023	Sep. 30, 2022		Sep. 30, 2023		Sep. 30, 2022		Dec. 31, 2022
Other Real Estate Owned, Gross		$ 472,000					$ 472,000				$ 472,000
Other Real Estate with Valuation Adjustments		4,000					4,000
Other Real Estate		468,000					468,000				$ 472,000
Foreclosed Assets, Gross		431,000					431,000
Other Foreclosed Assets, Valuation Allowance		44,000					44,000
Foreclosed Assets, Net of Valuation Reserve		387,000					387,000
Foreclosed Assets Valuation Adjustments, With Valuation Reserve		48,000			$ 31,000		48,000		$ 31,000
Valuation Reserve on Premises Held-for-sale	$ 553,000	$ (0)	[1]	$ 32,000	$ (0)	[1]	$ 585,000	[1]	$ (0)	[1]
[1] Not within the scope of ASC 606

X

- Definition

Represents gross amount of foreclosed assets before valuation allowance.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of foreclosed assets, net of valuation reserve.

+ References

No definition available.

+ Details

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

X

- Definition

Represents valuation adjustments of foreclosed assets with a valuation reserve.

+ References

No definition available.

+ Details

Name:	bfin_ForeclosedAssetsValuationAdjustmentsWithValuationReserve
Namespace Prefix:	bfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents valuation allowance for other foreclosed assets.

+ References

No definition available.

+ Details

Name:	bfin_OtherForeclosedAssetsValuationAllowance
Namespace Prefix:	bfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned, before valuation allowance.

+ References

No definition available.

+ Details

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

X

- Definition

Carrying amount of other real estate with valuation adjustments.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of valuation reserve on premises held-for-sale.

+ References

No definition available.

+ Details

Name:	bfin_ValuationReserveOnPremisesHeldforsale
Namespace Prefix:	bfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(4))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

+ Details

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