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Significant accounting policies (Policies) | 6 Months Ended
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Jun. 30, 2026
Accounting Policies [Abstract] |
Basis of Accounting | The consolidated interim financial statements of the Company were compiled in accordance with GAAP and with instructions for Form 10-Q and Article 10 Regulation S-X. The financial statements contain all adjustments which are, in the opinion of management, necessary for a fair statement of the Company's financial position, results of operations and cash flows for the interim periods presented. The consolidated interim financial statements should be read in conjunction with the consolidated financial statements included in the Company's 2025 Annual Report. Effective January 1, 2026, the Company elected to prospectively measure its residential mortgage loan servicing right assets at fair value with changes in fair value reflected in Mortgage banking revenues in the Consolidated Statement of Income. As a result, amortization associated with residential mortgage loan servicing right assets previously recognized in Other costs of operations in the Consolidated Statement of Income before 2026 is no longer recorded. Instead, beginning in 2026 fair value changes in residential mortgage loan servicing right assets, inclusive of the realization of expected net servicing revenues over time, are included in Mortgage banking revenues. The accounting election resulted in an increase to capitalized servicing assets, included in Accrued interest and other assets in the Consolidated Balance Sheet, of $263 million and a corresponding after-tax increase to Retained earnings of $197 million. On December 31, 2025 the Company began economically hedging the risk of fair value changes in those residential mortgage loan servicing right assets through the use of various interest rate and other derivative contracts, for which changes in fair value are reflected in Mortgage banking revenues in the Consolidated Statement of Income for the three and six months ended June 30, 2026. Consolidated Statement of Cash Flows For purposes of this statement, Cash and due from banks and federal funds sold are considered Cash and cash equivalents. Effective for the year ended December 31, 2025, the Company changed its accounting policy to also include Interest-bearing deposits at banks, which are primarily comprised of interest-bearing deposits at the FRB of New York, as Cash and cash equivalents. The Company considers such deposits to be an immediate source of funds in its liquidity management processes and therefore considers the accounting policy election preferable. Prior period amounts in the Consolidated Statement of Cash Flows have been adjusted to reflect this change in accounting policy as summarized in the following table:
| Six Months Ended June 30, 2025 |  |
(Dollars in millions) | Previously Reported |  | Adjusted |  |  |  |
Net change in interest-bearing deposits at banks | $ | (424) |  |  | $ | — |  |  |  |  |
Net cash from investing activities | (2,985) |  |  | (2,561) |  |  |  |  |
Net change in cash, cash equivalents and restricted cash | 219 |  |  | 643 |  |  |  |  |
Cash, cash equivalents and restricted cash at beginning of period | 1,909 |  |  | 20,782 |  |  |  |  |
Cash, cash equivalents and restricted cash at end of period | 2,128 |  |  | 21,425 |  |  |  |  |
The following table provides a description of accounting standards that were adopted by the Company in the six-month period ended June 30, 2026 as well as standards that were not yet effective at June 30, 2026 that could have an impact to M&T's consolidated financial statements upon adoption. Recent accounting developments
| Standard |  |  | Description |  |  | Required date of adoption |  |  | Effect on consolidated financial statements |
| Standards adopted in the six-month period ended June 30, 2026 |
| Improvements to the accounting for purchased loans |  |  | The standard expands the population of acquired financial assets accounted for using a gross-up approach which records an initial allowance for credit losses through an adjustment to the initial amortized cost basis. Acquired loans (excluding credit cards) are deemed purchased seasoned loans and accounted for using the gross-up approach upon acquisition if criteria established by the new guidance are met. All non-purchased credit deteriorated loans (excluding credit cards) that are acquired in a business combination are deemed seasoned. |  |  | January 1, 2027 (Early adoption permitted) |  |  | Effective January 1, 2026, the Company prospectively adopted the amended guidance, which did not have a material impact on its consolidated financial statements for the three and six month-periods ended June 30, 2026. |
| Standards not yet adopted as of June 30, 2026 |
| Income Statement - Expense disaggregation disclosures |  | The standard requires disclosure in the notes to financial statements of specified information about certain cost and expense captions on the income statement. |  |  | January 1, 2027 (Early adoption permitted) |  |  | The Company does not expect the guidance will have a material impact on its consolidated financial statements. |
| Hedge accounting improvements |  |  | The amendment expands the hedged risks permitted to be aggregated in a group of individual forecasted transactions in a cash flow hedge by changing the requirement to designate a group of individual forecasted transactions from having a shared risk exposure to having a similar risk exposure. The amendment also provides a model to facilitate the application of cash flow hedge accounting to forecasted interest payments on variable rate debt instruments that permit the borrower to change the interest rate index. The amendment also modifies certain other hedge accounting rules. |  |  | January 1, 2027 (Early adoption permitted) |  |  | The Company does not expect the guidance will have a material impact on its consolidated financial statements. |
| Targeted improvements to the accounting for internal-use software |  |  | The standard eliminates the concept of a software development project stage such that the guidance is agnostic to different software development methods and introduces a new threshold for cost capitalization. The standard also provides factors to consider when determining whether significant development uncertainty exists. |  |  | January 1, 2028 (Early adoption permitted) |  |  | The Company does not expect the guidance will have a material impact on its consolidated financial statements. |
Fair Value Measurements | GAAP permits an entity to choose to measure eligible financial instruments and other items at fair value. Effective January 1, 2026 the Company has elected to account for its residential mortgage loan servicing right assets at fair value. Further information about this election is included in note 1. The Company has not made any other fair value elections at June 30, 2026. Pursuant to GAAP, fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. A three-level hierarchy exists in GAAP for fair value measurements based upon the inputs to the valuation of an asset or liability. •Level 1 — Valuation is based on quoted prices in active markets for identical assets and liabilities. •Level 2 — Valuation is determined from quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar instruments in markets that are not active or by model-based techniques in which all significant inputs are observable in the market. •Level 3 — Valuation is derived from model-based and other techniques in which at least one significant input is unobservable and which may be based on the Company's own estimates about the assumptions that market participants would use to value the asset or liability. When available, the Company attempts to use quoted market prices in active markets to determine fair value and classifies such items as Level 1 or Level 2. If quoted market prices in active markets are not available, fair value is often determined using model-based techniques incorporating various assumptions including interest rates, prepayment speeds and credit losses. Assets and liabilities valued using model-based techniques are classified as either Level 2 or Level 3, depending on the lowest level classification of an input that is considered significant to the overall valuation. A description of the valuation methodologies used for the Company's assets and liabilities that are measured at fair value on a recurring basis and on a nonrecurring basis is included in notes 1 and 19 of Notes to Financial Statements in M&T's 2025 Annual Report.

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- Definition Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483426/235-10-50-4 + Details
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- Definition Disclosure of accounting policy for fair value measurements of financial and non-financial assets, liabilities and instruments classified in shareholders' equity. Disclosures include, but are not limited to, how an entity that manages a group of financial assets and liabilities on the basis of its net exposure measures the fair value of those assets and liabilities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2D -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2D Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2C -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2C + Details
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