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Note 5 - Foreclosed Assets - Activity in the Valuation Allowance (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Beginning balance	$ 281,000	$ 0	$ 0	$ 0
Additions charged to expense	124,000	0	405,000	0
Reductions from sales	(69,000)	0	(69,000)	0
Ending balance	$ 336,000	$ 0	$ 336,000	$ 0

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