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RECENT ACCOUNTING PRONOUNCEMENTS (Policies) | 9 Months Ended
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Sep. 30, 2025
Accounting Policies [Abstract] |
Subsequent Events | We evaluated events that occurred between September 30, 2025 and the date the consolidated financial statements were issued, and determined that there were no material events requiring adjustments to our consolidated financial statements or significant disclosure in the accompanying Notes.
Basis of Accounting | The consolidated financial statements include our accounts and those of our majority-owned, consolidated subsidiaries. This also includes our wholly-owned subsidiaries, such as ZMFU II, Inc., which is utilized for our municipal lending business, and Zions Direct, Inc., a registered broker-dealer under the Exchange Act, among other subsidiaries. Investments in which we have the ability to exercise significant influence over the operating and financial policies of the investee are accounted for using the equity method. All intercompany accounts and transactions have been eliminated in consolidation. Assets held in an agency or fiduciary capacity are excluded from the consolidated financial statements. The accompanying unaudited consolidated financial statements of Zions Bancorporation, N.A., and its majority-owned subsidiaries have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all normal and recurring adjustments considered necessary for a fair presentation have been included. References to GAAP, including standards promulgated by the Financial Accounting Standards Board (“FASB”), are made according to sections of the Accounting Standards Codification.
Recent Accounting Pronouncements and Developments |
Standard |  | Description |  | Effective date |  | Effect on the financial statements or other significant matters
Standards not yet adopted by the Bank as of September 30, 2025
ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40) |  | This accounting standards update (“ASU”) requires additional disclosures of certain costs and expenses in both interim and annual reporting periods, including: •Amounts of employee compensation, depreciation, and intangible asset amortization included in certain expense lines presented on the face of the income statement within continuing operations. •A qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively. •The Bank's definition and amount of selling costs. |  | Annual periods beginning January 1, 2027; Interim periods beginning January 1, 2028 |  | The overall effect of this standard is not expected to have a material impact on our consolidated financial statements.
ASU 2025-06, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40) |  | This ASU modernizes the accounting treatment for internal-use software to better reflect current development practices, including agile and iterative approaches. Key provisions include: •Elimination of Prescriptive Project Stages: The guidance no longer requires classification of costs by development phase, thereby removing rigid stage-based criteria. •Capitalization Criteria: Capitalization of eligible software development costs commences once management has both authorized and committed to funding the project, and it is probable that the project will be completed. This assessment must consider any significant development uncertainties, such as the inclusion of novel or unproven functionalities and whether performance requirements are subject to substantial revision. •Updated Disclosure Requirements: Disclosure obligations are now aligned with those outlined in Subtopic 360-10, Property, Plant, and Equipment. Requirements under Subtopic 350-30 are no longer applicable. |  | Annual and interim periods beginning after December 15, 2027. |  | The overall effect of this standard is not expected to have a material impact on our consolidated financial statements.
Standards adopted by the Bank during 2025
ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures |  | This ASU requires additional detailed information to improve the usefulness of income tax disclosures. This includes providing detailed annual disclosures on rate reconciliation and income taxes paid for specific categories and when certain quantitative thresholds are met. |  | Annual periods beginning January 1, 2025 |  | The overall effect of this standard is not expected to have a material impact on our consolidated financial statements.
Allowance for Credit Losses | Allowance for Credit Losses The allowance for credit losses (“ACL”), which consists of the allowance for loan and lease losses (“ALLL”) and the reserve for unfunded lending commitments (“RULC”), represents our estimate of current expected credit losses related to the loan and lease portfolio and unfunded lending commitments as of the balance sheet date. For additional information regarding our policies and methodologies used to estimate the ACL, see Note 6 of our 2024 Form 10-K. The ACL on AFS and HTM debt securities is estimated independently from the ACL on loans. For HTM securities, the ACL is evaluated using the same methodology applied to loans and leases measured at amortized cost. For more information regarding our methodology used to estimate the ACL on AFS and HTM debt securities, see Note 5 of our 2024 Form 10-K.

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