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v3.25.3

Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Factored Receivable Unpaid Principal Balance, Excluding Accrued Interest | $ 4,200,000 | $ 6,700,000
Factored Receivable, Customer Reserves | $ 836,000 | $ 1,500,000

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, excluding accrued interest + References No definition available. + Details
Name: | bfin_FactoredReceivableUnpaidPrincipalBalanceExcludingAccruedInterest
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant