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v3.23.2

Note 7 - Fair Value (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Valuation Reserve on Premises Held-for-sale | $ 32,000 | [1] | $ 553,000 | $ (0) | [1] | $ 585,000 | [1] | $ (0) | [1]
[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