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Note 4 - Loans Receivable (Details Textual) Pure in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 USD ($) | Mar. 31, 2021 | Dec. 31, 2021 USD ($)
Reserve for Uncollected Loan Interest | $ 47,000 |  | $ 140,000
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | $ 0 |  | $ 0
Financing Receivable, Modifications, Number of Contracts | 0 | 0 |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | 0 | 0 |

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- Definition The amount of reserve for uncollected loan interest. + 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 Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
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- Definition Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953682-111524 + Details
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- Definition Amount of unfunded portion of contractual agreement to lend funds to borrower for financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=121585226&loc=d3e18794-111554 + Details
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