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Note 14 - Fair Value (Details Textual) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2023
Valuation Reserve on Premises Held-for-sale | $ 553,000 | $ 49,000 | $ 602,000 | [1] | $ (0) | [1] |
Other Real Estate Owned, Gross |  | 472,000 | 472,000 |  | 472,000 |  |
Other Real Estate with Valuation Adjustments |  | 67,000 | 67,000 |  |  |  |
Other Real Estate |  | 405,000 | 405,000 |  | 472,000 |  |
Foreclosed Assets, Gross |  |  |  |  |  |  | $ 431,000
Other Foreclosed Assets, Valuation Allowance |  | 111,000 | 111,000 |  |  |  |
Foreclosed Assets, Net of Valuation Reserve |  | 387,000 | 387,000 |  |  |  |
Foreclosed Assets Valuation Adjustments, With Valuation Reserve |  |  |  |  | $ 31,000 |  |
Impaired Loans [Member] |  |  |  |  |  |  |
Other Foreclosed Assets, Valuation Allowance |  | $ 44,000 | $ 44,000 |  |  |  |
[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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Balance Type: | debit
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X
- Definition The amount of foreclosed assets, net of valuation reserve. + References No definition available. + Details
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- Definition Represents valuation adjustments of foreclosed assets with a valuation reserve. + References No definition available. + Details
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- 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
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- Definition Carrying amount of other real estate with valuation adjustments. + References No definition available. + Details
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Namespace Prefix: | bfin_
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Balance Type: | debit
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- Definition Amount of valuation reserve on premises held-for-sale. + References No definition available. + Details
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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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- Details
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