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Note 4 - Loans Receivable - COVID Loan Forbearance Program (Details) $ in Thousands | Sep. 30, 2020 USD ($)
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Number of loans | 146
Principal balance | $ 95,539
Principal Amount Deferred | $ 608
COVID 19 [Member] | Standard Forbearance Agreement [Member] | Finance Leases Portfolio Segment [Member] |
Number of loans | 25
Principal balance | $ 9,211
Principal Amount Deferred | $ 0
Multi-family Mortgage [Member] | COVID 19 [Member] | Small Investment Property Forbearance Agreement [Member] |
Number of loans | 15
Principal balance | $ 4,511
Principal Amount Deferred | $ 46
Multi-family Mortgage [Member] | COVID 19 [Member] | Standard Forbearance Agreement [Member] |
Number of loans | 53
Principal balance | $ 42,663
Principal Amount Deferred | $ 185
Nonresidential Real Estate [Member] | COVID 19 [Member] | Small Investment Property Forbearance Agreement [Member] |
Number of loans | 15
Principal balance | $ 5,871
Principal Amount Deferred | $ 93
Nonresidential Real Estate [Member] | COVID 19 [Member] | Standard Forbearance Agreement [Member] |
Number of loans | 28
Principal balance | $ 31,861
Principal Amount Deferred | $ 273
One-to-Four Family Residential Real Estate [Member] | COVID 19 [Member] | Standard Forbearance Agreement [Member] |
Number of loans | 10
Principal Amount Deferred | $ 11
One To Four Family Residential Real Estate Loans [Member] | COVID 19 [Member] | Standard Forbearance Agreement [Member] |
Principal balance | $ 1,422

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_UnusualOrInfrequentItemAxis=bfin_Covid19Member
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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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