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Note 14 - Fair Value (Details Textual) Pure in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Impaired Loans, Fair Value Disclosure | $ 296,000 |  |  |  |  |  |  |  | $ 296,000 |
Impaired Loans, Valuation Allowance | 28,000 |  |  |  |  |  |  |  | 28,000 |
Number of Loans Measured for Impairment Using Fair Value of Collateral |  |  |  |  | 0 |  |  |  |  | 0
Provision for Loan and Lease Losses, Total | (271,000) | $ (187,000) | $ 42,000 | $ 471,000 | $ 89,000 | $ (134,000) | $ 3,957,000 | $ (87,000) | 55,000 | $ 3,825,000
Other Real Estate with Valuation Adjustments | $ 0 |  |  |  | $ 0 |  |  |  | 0 | 0
Impaired Loans [Member] |  |  |  |  |  |  |  |  |  |
Provision for Loan and Lease Losses, Total |  |  |  |  |  |  |  |  | $ 28,000 | $ 0

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- Definition The fair value portion of impaired loans. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Represents valuation allowance of impaired loans. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The number of loans measured for impairment using the fair value of the collateral. + References No definition available. + Details
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Namespace Prefix: | bfin_
Data Type: | xbrli:integerItemType
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- Definition Carrying amount of other real estate with valuation adjustments. + References No definition available. + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Details
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