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v3.23.1

Note 7 - Fair Value (Details Textual) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Valuation Reserve on Premises Held-for-sale | [1] | $ 553,000 | $ (0)
[1] | Not within the scope of ASC 606

X
- Definition Amount of valuation reserve on premises held-for-sale. + References No definition available. + Details
Name: | bfin_ValuationReserveOnPremisesHeldforsale
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration