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v3.22.1

Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Factored Receivable Unpaid Principal Balance | $ 5,400,000 | $ 187,000
Factored Receivable, Customer Reserves | $ 1,300,000 | $ 122,000

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. + References No definition available. + Details
Name: | bfin_FactoredReceivableUnpaidPrincipalBalance
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant