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Note 14 - Fair Value - Quantitative Information for Financial Instruments on Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] $ in Thousands | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | ---
One-to-Four Family Residential Real Estate [Member] |  |
Foreclosed assets |  | $ 268
One-to-Four Family Residential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Foreclosed assets |  | $ 268
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, measurement input |  | 0.220
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member] |  |
Impaired loans - nonresidential real estate, fair value | $ 267 |
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Impaired loans - nonresidential real estate, fair value | $ 267 |
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member] |  |
Imapired loans, measurement input | 0.220 |

X
- Definition Represents fair value of foreclosed assets. + References No definition available. + Details
Name: | bfin_ForeclosedAssetsFairValue
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
Name: | bfin_ForeclosedAssetsMeasurementInput
Namespace Prefix: | bfin_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value portion of impaired financing receivable. + References No definition available. + Details
Name: | bfin_ImpairedFinancingReceivableFairValue
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
Name: | bfin_ImpairedFinancingReceivableMeasurementInput
Namespace Prefix: | bfin_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_MarketApproachValuationTechniqueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |