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Note 14 - Fair Value - Financial Assets At Fair Value on Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
One-to-Four Family Residential Real Estate [Member] |  |
Foreclosed assets |  | $ 268
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member] |  |
Impaired loans - nonresidential real estate, fair value | $ 267 |
Fair Value, Inputs, Level 1 [Member] | One-to-Four Family Residential Real Estate [Member] |  |
Foreclosed assets |  | 0
Fair Value, Inputs, Level 1 [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member] |  |
Impaired loans - nonresidential real estate, fair value | 0 |
Fair Value, Inputs, Level 2 [Member] | One-to-Four Family Residential Real Estate [Member] |  |
Foreclosed assets |  | 0
Fair Value, Inputs, Level 2 [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member] |  |
Impaired loans - nonresidential real estate, fair value | 0 |
Fair Value, Inputs, Level 3 [Member] | One-to-Four Family Residential Real Estate [Member] |  |
Foreclosed assets |  | $ 268
Fair Value, Inputs, Level 3 [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [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
Name: | bfin_ForeclosedAssetsFairValue
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
Name: | bfin_ImpairedFinancingReceivableFairValue
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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