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Note 8 - Fair Value (Details Textual) Pure in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Impaired Loans, Fair Value Disclosure | $ 296,000 |  | $ 28,000
Number of Loans Measured for Impairment Using Fair Value of Collateral |  |  | 0
Provision for Loan and Lease Losses, Total | (335,000) | $ 471,000 |
Other Real Estate with Valuation Adjustments | 0 |  | $ 0
Impaired Loans [Member] |  |  |
Provision for Loan and Lease Losses, Total | $ 28,000 | $ 0 |

X
- 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 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
Balance Type: | na
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- Definition Carrying amount of other real estate with valuation adjustments. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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