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Note 4 - Loans Receivable - COVID Loan Forbearance Program (Details) $ in Thousands | Dec. 31, 2020 USD ($)
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Number of loans | 30
Principal balance | $ 10,337
Principal Amount Deferred | $ 53
Multi-family Mortgage [Member] | COVID 19 [Member] | Small Investment Property Forbearance Agreement [Member] |
Number of loans | 8
Principal balance | $ 3,092
Principal Amount Deferred | $ 17
Nonresidential Real Estate [Member] | COVID 19 [Member] | Small Investment Property Forbearance Agreement [Member] |
Number of loans | 10
Principal balance | $ 3,363
Principal Amount Deferred | $ 22
Nonresidential Real Estate [Member] | COVID 19 [Member] | Standard Forbearance Agreement [Member] |
Number of loans | 2
Principal balance | $ 2,480
Principal Amount Deferred | $ 6
One-to-Four Family Residential Real Estate [Member] | COVID 19 [Member] | Standard Forbearance Agreement [Member] |
Number of loans | 10
Principal Amount Deferred | $ 8
One To Four Family Residential Real Estate Loans [Member] | COVID 19 [Member] | Standard Forbearance Agreement [Member] |
Principal balance | $ 1,402

X
- Definition Represents number of loans under financing receivable. + References No definition available. + Details
Name: | bfin_FinancingReceivableNumberOfLoans
Namespace Prefix: | bfin_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents principal balance of financing receivable. + References No definition available. + Details
Name: | bfin_FinancingReceivablePrincipalBalance
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Deferred amounts of principal only payments on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19. + References No definition available. + Details
Name: | bfin_FinancingReceivablePrincipalOnlyDeferredPayments
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | us-gaap_UnusualOrInfrequentItemAxis=bfin_COVID19Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=bfin_SmallInvestmentPropertyForbearanceAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=bfin_StandardForbearanceAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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