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Note 12 - Employee Benefit Plan (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Share Based Compensation And Postretirement Benefits, Minimum Age Of Employee (Year) | 21 years |
Share Based Compensation And Postretirement Benefits, Period of Service Required For Eligibility (Year) | 1 year |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 50.00% |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 6.00% |
Defined Contribution Plan, Cost | $ 351,000 | $ 333,000

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- Definition Represents minimum age if employee for share based compensation and postretirement benefits. + References No definition available. + Details
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- Definition Represents period of service required for eligibility for share based compensation and protirement benefits. + References No definition available. + Details
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Namespace Prefix: | bfin_
Data Type: | xbrli:durationItemType
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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