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Note 7 - Fair Value (Details Textual) - USD ($)		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Valuation Reserve on Premises Held-for-sale	[1]	$ (0)	$ 553,000
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		$ 0	$ 0
[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

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