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Note 7 - Fair Value (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Impaired Loans, Fair Value Disclosure |  |  | $ 297,000 |
Impaired Loans, Valuation Allowance |  |  | 30,000 |
Increase (Decrease) in Impaired Loans Valuation Allowance |  |  | 30,000 |
Foreclosed Assets, Gross | $ 913,000 |  | 952,000 |
Foreclosed Assets, Valuation Allowance | 219,000 | $ 0 | 227,000 | $ 0
Foreclosed Assets, Net of Valuation Reserve | 694,000 |  | $ 725,000 |
Foreclosed Assets Valuation Adjustments, With Valuation Reserve | $ 0 | 0 |  |
Impaired Loans [Member] |  |  |  |
Impaired Loans, Valuation Allowance |  | $ 28,000 |  |

X
- Definition Represents gross amount of foreclosed assets before valuation allowance. + References No definition available. + Details
Name: | bfin_ForeclosedAssetsGross
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of foreclosed assets, net of valuation reserve. + References No definition available. + Details
Name: | bfin_ForeclosedAssetsNetOfValuationReserve
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents valuation adjustments of foreclosed assets with a valuation reserve. + References No definition available. + Details
Name: | bfin_ForeclosedAssetsValuationAdjustmentsWithValuationReserve
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents valuation allowance of foreclosed assets. + References No definition available. + Details
Name: | bfin_ForeclosedAssetsValuationAllowance
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fair value portion of impaired loans. + References No definition available. + Details
Name: | bfin_ImpairedLoansFairValueDisclosure
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents valuation allowance of impaired loans. + References No definition available. + Details
Name: | bfin_ImpairedLoansValuationAllowance
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of increase (decrease) of the recorded impaired loans valuation allowance during the reporting period. + References No definition available. + Details
Name: | bfin_IncreaseDecreaseInImpairedLoansValuationAllowance
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bfin_ImpairedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |