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Note 7 - Fair Value (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Other Real Estate Owned, Gross |  | $ 472,000 |  |  |  |  | $ 472,000 |  |  |  | $ 472,000
Other Real Estate with Valuation Adjustments |  | 4,000 |  |  |  |  | 4,000 |  |  |  |
Other Real Estate |  | 468,000 |  |  |  |  | 468,000 |  |  |  | $ 472,000
Foreclosed Assets, Gross |  | 431,000 |  |  |  |  | 431,000 |  |  |  |
Other Foreclosed Assets, Valuation Allowance |  | 44,000 |  |  |  |  | 44,000 |  |  |  |
Foreclosed Assets, Net of Valuation Reserve |  | 387,000 |  |  |  |  | 387,000 |  |  |  |
Foreclosed Assets Valuation Adjustments, With Valuation Reserve |  | 48,000 |  |  | $ 31,000 |  | 48,000 |  | $ 31,000 |  |
Valuation Reserve on Premises Held-for-sale | $ 553,000 | $ (0) | [1] | $ 32,000 | $ (0) | [1] | $ 585,000 | [1] | $ (0) | [1] |
[1] | Not within the scope of ASC 606

X
- Definition Represents gross amount of foreclosed assets before valuation allowance. + References No definition available. + Details
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Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of foreclosed assets, net of valuation reserve. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Represents valuation adjustments of foreclosed assets with a valuation reserve. + References No definition available. + Details
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Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents valuation allowance for other foreclosed assets. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition Carrying amount of other real estate not separately disclosed, including, but not limited to, 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, before valuation allowance. + References No definition available. + Details
Name: | bfin_OtherRealEstateOwnedGross
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Carrying amount of other real estate with valuation adjustments. + References No definition available. + Details
Name: | bfin_OtherRealEstateWithValuationAdjustments
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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
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- Definition Carrying amount of other real estate not separately disclosed, including, but not limited to, 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. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure. + 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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