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Note 7 - Fair Value (Details Textual) - USD ($)		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Valuation Reserve on Premises Held-for-sale	[1]	$ 553,000	$ (0)
[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