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Significant Accounting Policies (Policies) | 9 Months Ended
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Sep. 30, 2025
Accounting Policies [Abstract] |
Basis of Accounting, Policy [Policy Text Block] | Basis of Presentation: BankFinancial Corporation, a Maryland corporation headquartered in Burr Ridge, Illinois, is the owner of all of the issued and outstanding capital stock of BankFinancial, National Association (the “Bank”). The interim unaudited consolidated financial statements include the accounts and transactions of BankFinancial Corporation, the Bank, and the Bank’s wholly-owned subsidiaries, Financial Assurance Services, Inc. and BFIN Asset Recovery Company, LLC (collectively, the “Company”), and reflect all normal and recurring adjustments that are, in the opinion of management, considered necessary for a fair presentation of the financial condition and results of operations for the periods presented. Such adjustments are the only adjustments reflected in the accompanying financial statements. All significant intercompany accounts and transactions have been eliminated. The results of operations for the three and nine-month periods ended September 30, 2025 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2025 or for any other period. Certain information and note disclosures normally included in financial statements prepared in conformity with accounting principles generally accepted in the United States of America (“US GAAP”) have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). On August 11, 2025, the Company and First Financial Bancorp. (“First Financial”), the parent company of First Financial Bank, entered into an Agreement and Plan of Merger. The Merger Agreement provides that, upon the terms and subject to the conditions set forth therein, BankFinancial would merge with and into First Financial (the “Merger”), with First Financial continuing as the surviving corporation in the Merger. Immediately following the Merger, First Financial will cause BankFinancial NA to merge with and into First Financial Bank (the “Bank Merger”), with First Financial Bank continuing as the surviving bank in the Bank Merger. The Merger Agreement has been unanimously approved by the boards of directors of First Financial and BankFinancial. The closing of the Merger remains subject to satisfaction of customary closing conditions, regulatory approvals and approval of BankFinancial’s stockholders.
Use of Estimates, Policy [Policy Text Block] | Use of Estimates: The preparation of the consolidated financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Although these estimates and assumptions are based on the best available information, actual information and actual results could differ from those estimates.
Interest-bearing Deposits in Other Financial Institutions [Policy Text Block] | Interest-Bearing Time Deposits in other Financial Institutions: Interest-bearing time deposits in other financial institutions include investments in certificates of deposit with original maturities greater than 90 days. These certificates of deposit are placed with insured institutions for varying maturities and amounts that are fully insured by the Federal Deposit Insurance Corporation (“FDIC”).
Receivable [Policy Text Block] | Factored Receivables: The Company purchases invoices from its factoring customers in schedules or batches. These receivables are included in loans receivable on the Consolidated Statements of Financial Condition, and as commercial loans and leases in Note 4 - Loans Receivable. The face value of the invoices purchased or amount advanced is recorded by the Company as factored receivables, and the unadvanced portions of the invoices purchased, less fees, are considered customer reserves. The customer reserves are held to settle any payment disputes or collection shortfalls. Customer reserves may be used to pay customers’ obligations to various third parties as directed by the customer. Customer reserves are periodically released to or withdrawn by customers, and are reported as noninterest-bearing deposits in the Consolidated Statements of Financial Condition. The unpaid principal balances of these receivables were $4.2 million and $6.7 million at September 30, 2025 and December 31, 2024, respectively, and are included in commercial loans and leases. The customer reserves associated with the factored receivables were $836,000 and $1.5 million at September 30, 2025 and December 31, 2024, respectively. Factoring fees are recognized in interest income as incurred by the customer and deducted from the customer's reserve balances. Other factoring-related fees, which include wire transfer fees, broker fees, and other similar fees, are reported by the Company as loan servicing fees in noninterest income.
Reclassification, Comparability Adjustment [Policy Text Block] | Reclassifications: Certain reclassifications have been made in the prior period’s financial statements to conform them to the current period’s presentation with no impact on previously reported net income or stockholders' equity. Activity for the nine months ended September 30, 2024 for interest-bearing time deposits in other financial institutions has been reclassified in the statement of cashflows to conform with current period's presentation. There is no impact on net income or stockholders' equity. These unaudited consolidated financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2024, as filed with the SEC.
New Accounting Pronouncements, Policy [Policy Text Block] | Recently Issued Accounting Standards Not Yet Adopted In December 2023, the FASB issued ASU 2023‑09 “Income Taxes (Topic 740): Improvements to Income Tax Disclosures,” which requires more detailed disclosures of income taxes paid net of refunds received, income from continuing operations before income tax expense or benefit, and income tax expense from continuing operations. This standard is to be applied on a prospective basis, with retrospective application permitted, and will be effective for the Company for annual periods beginning on January 1, 2025. We do not expect adoption of this standard to have a material impact on the Company’s financial position or results of operations. In November 2024, the FASB issued ASU 2024-03, "Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses". This ASU requires public companies to disclose specified information about certain costs and expenses in the notes to financial statements at each interim and annual reporting period. Specifically, public companies will be required to disclose the amounts of (a) purchases of inventory; (b) employee compensation; (c) depreciation; (d) intangible asset amortization; and (e) depreciation, depletion, and amortization recognized as part of oil- and gas producing activities (or other amounts of depletion expense) included in each relevant expense caption. Within the same tabular disclosure, an entity must disclose certain expense, gain, or loss amounts that are already required under current U.S. GAAP. Further, an entity must disclose a qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively. In addition, an entity must disclose the total amount of selling expenses and, in annual reporting periods, an entity’s definition of selling expenses. The amendments in this ASU are effective for annual periods beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. Early adoption is permitted. We do not expect adoption of this standard to have a material impact on the Company’s financial position or results of operations. Recent Developments On July 4, 2025, the President signed H.R. 1, the “One Big Beautiful Bill Act,” into law. The legislation includes several changes to federal tax law that generally allow for more favorable deductibility of certain business expenses beginning in 2025, including the restoration of immediate expensing of domestic R&D expenditures, reinstatement of 100% bonus depreciation, and more favorable rules for determining the limitation on business interest expense. We do not expect this to have a material impact on the Company’s financial position or results of operations.

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