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Note 5 - Foreclosed Assets (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Mortgage Loans in Process of Foreclosure, Amount | $ 0 | $ 0
Other Real Estate, Foreclosed Assets, and Repossessed Assets, Total | 2,777 | $ 476
Foreclosed Residential Real Estate Properties, Physical Possession Without Title [Member] |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets, Total | $ 0 |

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- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 35 -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-35 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant

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- Definition Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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Balance Type: | debit
Period Type: | instant

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- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=bfin_ForeclosedResidentialRealEstatePropertiesPhysicalPossessionWithoutTitleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |