Significant accounting policies (Policies)	6 Months Ended
Jun. 30, 2025
Accounting Policies [Abstract]
Basis of Accounting	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 2024 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. Standards applicable to M&T but not yet adopted at June 30, 2025 primarily address enhanced disclosure requirements for income taxes and the disaggregated income statement presentation of certain expenses and are not expected to have a material impact to the Company's consolidated financial statements.

Significant accounting policies (Policies)

6 Months Ended

Jun. 30, 2025

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 2024 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. Standards applicable to M&T but not yet adopted at June 30, 2025 primarily address enhanced disclosure requirements for income taxes and the disaggregated income statement presentation of certain expenses and are not expected to have a material impact to the Company's consolidated financial statements.