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Fair value measurements | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Fair value measurements | 13. Fair value measurements GAAP permits an entity to choose to measure eligible financial instruments and other items at fair value. The Company has not made any fair value elections at September 30, 2025. 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 estimated fair value on a recurring basis and on a nonrecurring basis is included in note 19 of Notes to Financial Statements in M&T's 2024 Annual Report. The following tables present assets and liabilities at September 30, 2025 and December 31, 2024 measured at estimated fair value on a recurring basis:
(Dollars in millions) | Fair Value Measurements |  | Level 1 |  | Level 2 |  | Level 3 (a)
September 30, 2025 |  |  |  |  |  |  |
Trading account | $ | 95 |  |  | $ | 95 |  |  | $ | — |  |  | $ | — |
Investment securities available for sale: |  |  |  |  |  |  |
U.S. Treasury | 6,620 |  |  | — |  |  | 6,620 |  |  | — |
Mortgage-backed securities: |  |  |  |  |  |  |
Government issued or guaranteed: |  |  |  |  |  |  |
Commercial | 4,861 |  |  | — |  |  | 4,861 |  |  | — |
Residential | 11,680 |  |  | — |  |  | 11,680 |  |  | — |
Other | 2 |  |  | — |  |  | 2 |  |  | — |
| 23,163 |  |  | — |  |  | 23,163 |  |  | — |
Equity securities | 258 |  |  | 258 |  |  | — |  |  | — |
Real estate loans held for sale | 605 |  |  | — |  |  | 605 |  |  | — |
Other assets (b) | 253 |  |  | — |  |  | 248 |  |  | 5 |
Total assets | $ | 24,374 |  |  | $ | 353 |  |  | $ | 24,016 |  |  | $ | 5 |
Other liabilities (b) | $ | 480 |  |  | $ | — |  |  | $ | 480 |  |  | $ | — |
Total liabilities | $ | 480 |  |  | $ | — |  |  | $ | 480 |  |  | $ | — |
December 31, 2024 |  |  |  |  |  |  |
Trading account | $ | 101 |  |  | $ | 101 |  |  | $ | — |  |  | $ | — |
Investment securities available for sale: |  |  |  |  |  |  |
U.S. Treasury | 7,931 |  |  | — |  |  | 7,931 |  |  | — |
Mortgage-backed securities: |  |  |  |  |  |  |
Government issued or guaranteed: |  |  |  |  |  |  |
Commercial | 3,702 |  |  | — |  |  | 3,702 |  |  | — |
Residential | 7,214 |  |  | — |  |  | 7,214 |  |  | — |
Other | 2 |  |  | — |  |  | 2 |  |  | — |
| 18,849 |  |  | — |  |  | 18,849 |  |  | — |
Equity securities | 235 |  |  | 235 |  |  | — |  |  | — |
Real estate loans held for sale | 521 |  |  | — |  |  | 521 |  |  | — |
Other assets (b) | 255 |  |  | — |  |  | 251 |  |  | 4 |
Total assets | $ | 19,961 |  |  | $ | 336 |  |  | $ | 19,621 |  |  | $ | 4 |
Other liabilities (b) | $ | 822 |  |  | $ | — |  |  | $ | 790 |  |  | $ | 32 |
Total liabilities | $ | 822 |  |  | $ | — |  |  | $ | 790 |  |  | $ | 32 |
__________________________________________________________________________________ (a)Significant unobservable inputs used in the fair value measurement of certain commitments to originate real estate loans held for sale included weighted-average commitment expirations of 26% at September 30, 2025 and 6% at December 31, 2024. An increase (decrease) in the estimate of expirations for commitments to originate real estate loans would generally result in a lower (higher) fair value measurement. Estimated commitment expirations are derived considering loan type, changes in interest rates and remaining length of time until closing. (b)Comprised predominantly of interest rate swap agreements used for interest rate risk management (Level 2), interest rate and foreign exchange contracts not designated as hedging instruments (Level 2), commitments to sell real estate loans (Level 2) and commitments to originate real estate loans to be held for sale (Level 2 and Level 3). The Company is required, on a nonrecurring basis, to adjust the carrying value of certain assets or provide valuation allowances related to certain assets using fair value measurements. The more significant of those assets follow. Loans Loans subject to nonrecurring fair value measurement were $577 million at September 30, 2025 ($283 million and $294 million of which were classified as Level 2 and Level 3, respectively), $847 million at December 31, 2024 ($187 million and $660 million of which were classified as Level 2 and Level 3, respectively) and $805 million at September 30, 2024 ($159 million and $646 million of which were classified as Level 2 and Level 3, respectively). Changes in fair value recognized for partial charge-offs of loans and loan impairment reserves on loans held by the Company on September 30, 2025 were decreases of $67 million and $154 million for the three-month and nine-month periods ended September 30, 2025, respectively. Changes in fair value recognized for partial charge-offs of loans and loan impairment reserves on loans held by the Company on September 30, 2024 were decreases of $81 million and $204 million for the three-month and nine-month periods ended September 30, 2024, respectively. Capitalized servicing rights Capitalized servicing rights related to mortgage loans required no valuation allowance at each of September 30, 2025, December 31, 2024 and September 30, 2024. Disclosures of fair value of financial instruments The carrying amounts and estimated fair value for certain financial instruments that are not recorded at fair value in the Company's Consolidated Balance Sheet are presented in the following table:
(Dollars in millions) | Carrying Amount |  | Estimated Fair Value |  | Level 1 |  | Level 2 |  | Level 3
September 30, 2025 |  |  |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 1,950 |  |  | $ | 1,950 |  |  | $ | 1,811 |  |  | $ | 139 |  |  | $ | — |
Interest-bearing deposits at banks | 16,751 |  |  | 16,751 |  |  | — |  |  | 16,751 |  |  | — |
Investment securities held to maturity | 12,711 |  |  | 11,924 |  |  | — |  |  | 11,879 |  |  | 45 |
Loans, net | 134,813 |  |  | 134,595 |  |  | — |  |  | 7,113 |  |  | 127,482 |
Financial liabilities: |  |  |  |  |  |  |  |  |
Time deposits | 13,620 |  |  | 13,591 |  |  | — |  |  | 13,591 |  |  | — |
Short-term borrowings | 2,059 |  |  | 2,059 |  |  | — |  |  | 2,059 |  |  | — |
Long-term borrowings | 12,928 |  |  | 13,163 |  |  | — |  |  | 13,163 |  |  | — |
December 31, 2024 |  |  |  |  |  |  |  |  |
Financial assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 1,909 |  |  | 1,909 |  |  | 1,749 |  |  | 160 |  |  | — |
Interest-bearing deposits at banks | 18,873 |  |  | 18,873 |  |  | — |  |  | 18,873 |  |  | — |
Investment securities held to maturity | 14,195 |  |  | 12,955 |  |  | — |  |  | 12,909 |  |  | 46 |
Loans, net | 133,397 |  |  | 131,334 |  |  | — |  |  | 6,806 |  |  | 124,528 |
Financial liabilities: |  |  |  |  |  |  |  |  |
Time deposits | 14,476 |  |  | 14,463 |  |  | — |  |  | 14,463 |  |  | — |
Short-term borrowings | 1,060 |  |  | 1,060 |  |  | — |  |  | 1,060 |  |  | — |
Long-term borrowings | 12,605 |  |  | 12,754 |  |  | — |  |  | 12,754 |  |  | — |
With the exception of marketable securities and mortgage loans originated for sale, the Company’s financial instruments presented in the preceding tables are not readily marketable and market prices do not exist. Generally, the Company has not attempted to market its financial instruments to potential buyers, if any exist. Since negotiated prices in illiquid markets depend greatly upon the then present motivations of the buyer and seller, it is reasonable to assume that actual sales prices could vary widely from any estimate of fair value made without the benefit of negotiations. Additionally, changes in market interest rates can dramatically impact the value of financial instruments in a short period of time. The Company does not believe that the estimated information presented herein is representative of the earnings power or value of the Company. The preceding analysis, which is inherently limited in depicting fair value, also does not consider any value associated with existing customer relationships nor the ability of the Company to create value through loan origination, deposit gathering or fee generating activities. Many of the estimates presented herein are based upon the use of highly subjective information and assumptions and, accordingly, the results may not be precise. Management believes that fair value estimates may not be comparable between financial institutions due to the wide range of permitted valuation techniques and numerous estimates which must be made. Furthermore, because the disclosed fair value amounts were estimated as of the balance sheet date, the amounts actually realized or paid upon maturity or settlement of the various financial instruments could be significantly different.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 940 -SubTopic 820 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478119/940-820-50-1 + Details
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