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Note 7 - Fair Value (Details Textual) - USD ($)	3 Months Ended					6 Months Ended
	Jun. 30, 2023		Mar. 31, 2023	Jun. 30, 2022		Jun. 30, 2023		Jun. 30, 2022
Valuation Reserve on Premises Held-for-sale	$ 32,000	[1]	$ 553,000	$ (0)	[1]	$ 585,000	[1]	$ (0)	[1]
[1] Not within the scope of ASC 606

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