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Note 8 - Fair Value (Details Textual) Pure in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Number of Loans Measured for Impairment Using Fair Value of Collateral | 0 |  | 0 |  | 0
Other Real Estate, Valuation Adjustments | $ (0) | $ 21 | $ (0) | $ 21 | $ 0

X
- Definition The number of loans measured for impairment using the fair value of the collateral. + References No definition available. + Details
Name: | bfin_NumberOfLoansMeasuredForImpairmentUsingFairValueOfCollateral
Namespace Prefix: | bfin_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Valuation adjustments made to 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. This excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure. + References No definition available. + Details
Name: | us-gaap_OtherRealEstateValuationAdjustments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration