Significant accounting policies	3 Months Ended
Significant accounting policies	Mar. 31, 2013
Accounting Policies [Abstract]
Significant accounting policies	1. Significant accounting policies The consolidated financial statements of M&T Bank Corporation (“M&T”) and subsidiaries (“the Company”) were compiled in accordance with generally accepted accounting principles (“GAAP”) using the accounting policies set forth in note 1 of Notes to Financial Statements included in the 2012 Annual Report. In the opinion of management, all adjustments necessary for a fair presentation have been made and were all of a normal recurring nature.

The entire disclosure for all significant accounting policies of the reporting entity.