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Loan Commitments and Other Off-Balance Sheet Activities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Guarantor Obligations [Line Items] |  |
Duration of extension | 60 days |
Commitments to extend credit [Member] |  |
Guarantor Obligations [Line Items] |  |
Notional Or Contractual Credit Extension Commitments | $ 75,180 | $ 46,615
Fixed-rate loan commitments | 44,500 |
Standby letters of credit [Member] |  |
Guarantor Obligations [Line Items] |  |
Notional Or Contractual Credit Extension Commitments | 5,965 | 6,757
Unused lines of credit [Member] |  |
Guarantor Obligations [Line Items] |  |
Notional Or Contractual Credit Extension Commitments | 152,554 | 129,207
Commitments to sell mortgages [Member] |  |
Guarantor Obligations [Line Items] |  |
Notional Or Contractual Credit Extension Commitments | $ 0 | $ 0
Minimum [Member] | Commitments to extend credit [Member] |  |
Guarantor Obligations [Line Items] |  |
Fixed interest rate | 4.12% |
Maturity period | 1 year |
Maximum [Member] | Commitments to extend credit [Member] |  |
Guarantor Obligations [Line Items] |  |
Fixed interest rate | 7.00% |
Maturity period | 30 years |

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- Definition Commitments To Extend Credit, Duration Of Extension + References No definition available. + Details
Name: | bfin_CommitmentsToExtendCreditDurationOfExtension
Namespace Prefix: | bfin_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Notional Or Contractual Credit Extension Commitments, Loan Maturity + References No definition available. + Details
Name: | bfin_NotionaOrContractualCreditExtensionCommitmentsLoanMaturity
Namespace Prefix: | bfin_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Notional Or Contractual Credit Extension Commitments + References No definition available. + Details
Name: | bfin_NotionalOrContractualCreditExtensionCommitments
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Notional Or Contractual Credit Extension Commitments, Fixed Interest Rate + References No definition available. + Details
Name: | bfin_NotionalOrContractualCreditExtensionCommitmentsFixedInterestRate
Namespace Prefix: | bfin_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Notional Or Contractual Credit Extension Commitments, Fixed Interest Rate Loan + References No definition available. + Details
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Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

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

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

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

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |