Significant accounting policies |
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| Accounting Policies [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Significant accounting policies | 1. Significant accounting policies The consolidated interim financial statements of the Company were compiled in accordance with GAAP using the accounting policies set forth in note 1 of Notes to Financial Statements included in M&T's 2025 Annual Report. 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. 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 derivative contracts, for which changes in fair value in the recent quarter are reflected in Mortgage banking revenues in the Consolidated Statement of Income. 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:
During the second quarter of 2025, with the increased volume of sales and purchases of loans, the Company began separately presenting Proceeds from sales of loans, which were not originally held for sale, in the Consolidated Statement of Cash Flows. Previously proceeds from sales of loans, which were not originally held for sale, were included in Net change in loans in the Consolidated Statement of Cash Flows. Previously reported amounts for the three months ended March 31, 2025 have been reclassified to conform to the current presentation. 1. Significant accounting policiesThe following table provides a description of accounting standards that were adopted by the Company in the three-month period ended March 31, 2026 as well as standards that were not yet effective at March 31, 2026 that could have an impact to M&T's consolidated financial statements upon adoption. Recent accounting developments
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