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Note 7 - Fair Value - Financial Assets At Fair Value on Non-recurring Basis (Details) - USD ($) | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Other real estate owned, gross | $ 0 | $ 472,000
Fair Value, Nonrecurring [Member] | One-to-Four Family Residential Real Estate [Member] |  |
Other real estate owned, gross |  | 405,000
Other foreclosed assets |  | 387,000
Fair Value, Nonrecurring [Member] | One-to-Four Family Residential Real Estate [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Other real estate owned, gross |  | 0
Other foreclosed assets |  | 0
Fair Value, Nonrecurring [Member] | One-to-Four Family Residential Real Estate [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Other real estate owned, gross |  | 0
Other foreclosed assets |  | 0
Fair Value, Nonrecurring [Member] | One-to-Four Family Residential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Other real estate owned, gross |  | 405,000
Other foreclosed assets |  | $ 387,000

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 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
Period Type: | instant

X
- Details
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Namespace Prefix: |
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- Details
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- Details
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- Details
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- Details
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