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Note 7 - Fair Value - Quantitative Information for Financial Instruments on Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] $ in Thousands | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
--- | --- | ---
One-to-Four Family Residential Real Estate [Member] |  |
Foreclosed assets | $ 694 | $ 725
One-to-Four Family Residential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Foreclosed assets | $ 694 | $ 725
One-to-Four Family Residential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member] |  |
Foreclosed assets | 7.6 | 15.6
Nonresidential Real Estate [Member] | Real Estate Portfolio [Member] |  |
Impaired loans - nonresidential real estate, fair value |  | $ 267
Nonresidential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] | Real Estate Portfolio [Member] |  |
Impaired loans - nonresidential real estate, fair value |  | $ 267
Nonresidential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member] | Real Estate Portfolio [Member] |  |
Imapired loans, measurement input |  | 22.0

X
- Definition Represents fair value of foreclosed assets. + References No definition available. + Details
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Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents measurement input for foreclosed assets. + References No definition available. + Details
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Balance Type: | na
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X
- Definition Fair value portion of impaired financing receivable. + References No definition available. + Details
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Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Value of input used to measure impaired financing receivable. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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