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Note 7 - Fair Value - Financial Assets At Fair Value on Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
One-to-Four Family Residential Real Estate [Member] |  |
Foreclosed assets | $ 694 | $ 725
One-to-Four Family Residential Real Estate [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Foreclosed assets | 0 | 0
One-to-Four Family Residential Real Estate [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Foreclosed assets | 0 | 0
One-to-Four Family Residential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Foreclosed assets | $ 694 | 725
Nonresidential Real Estate [Member] | Real Estate Portfolio [Member] |  |
Impaired loans - nonresidential real estate, fair value |  | 267
Nonresidential Real Estate [Member] | Fair Value, Inputs, Level 1 [Member] | Real Estate Portfolio [Member] |  |
Impaired loans - nonresidential real estate, fair value |  | 0
Nonresidential Real Estate [Member] | Fair Value, Inputs, Level 2 [Member] | Real Estate Portfolio [Member] |  |
Impaired loans - nonresidential real estate, fair value |  | 0
Nonresidential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] | Real Estate Portfolio [Member] |  |
Impaired loans - nonresidential real estate, fair value |  | $ 267

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- 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

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- 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

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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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