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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Factored Receivable Unpaid Principal Balance	$ 6.3	$ 6.7
Factored Receivable, Customer Reserves	$ 1.1	$ 1.5

X

- Definition

Represents customer reserve related to factored receivables.

+ References

No definition available.

+ Details

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

X

- Definition

Represents factored receivable unpaid principal balance.

+ References

No definition available.

+ Details

Name:	bfin_FactoredReceivableUnpaidPrincipalBalance
Namespace Prefix:	bfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant