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Note 5 - Foreclosed Assets - Activity in the Valuation Allowance (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Beginning balance	$ 0	$ 0	$ 111	$ 0
Additions charged to expense	0	48	0	48
Reductions from sales	0	0	(111)	0
Ending balance	$ 0	$ 48	$ 0	$ 48

X

- Definition

Represents valuation allowance of foreclosed assets.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of the valuation allowance for foreclosed assets that was applied in the period against the carrying amount of foreclosed assets that was sold, written down or written off.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of gain recognized in the income statement for an increase in valuation of foreclosed assets.

+ References

No definition available.

+ Details

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