Regulatory matters (Tables)

12 Months Ended

Dec. 31, 2017

Banking And Thrift [Abstract]

Summary of Required Minimum and Well Capitalized Capital Ratios

Pursuant to the rules in effect as of December 31, 2017, the required minimum and well capitalized capital ratios are as follows:

				Well
	Minimum			Capitalized
●   Common equity Tier 1 ("CET1") to risk-weighted assets		4.5	%		6.5	%
●   Tier 1 capital to risk-weighted assets		6.0	%		8.0	%
●   Total capital to risk-weighted assets		8.0	%		10.0	%
●   Leverage — Tier 1 capital to average total assets, as defined		4.0	%		5.0	%

Capital Ratios and Amounts of Company and its Banking Subsidiaries

The capital ratios and amounts of the Company and its banking subsidiaries as of December 31, 2017 and 2016 are presented below:

	M&T (Consolidated)			M&T Bank			Wilmington Trust, N.A.
	(Dollars in thousands)
December 31, 2017:
Common equity Tier 1 capital
Amount	$	10,675,735		$	9,978,163		$	529,988
Ratio(a)		10.99	%		10.30	%		48.16	%
Tier 1 capital
Amount		11,908,166			9,978,163			529,988
Ratio(a)		12.26	%		10.30	%		48.16	%
Total capital
Amount		14,328,467			12,012,171			534,235
Ratio(a)		14.75	%		12.40	%		48.54	%
Leverage
Amount		11,908,166			9,978,163			529,988
Ratio(b)		10.31	%		8.68	%		13.03	%
December 31, 2016:
Common equity Tier 1 capital
Amount	$	10,849,642		$	10,115,688		$	496,801
Ratio(a)		10.70	%		10.02	%		57.08	%
Tier 1 capital
Amount		12,083,948			10,115,688			496,801
Ratio(a)		11.92	%		10.02	%		57.08	%
Total capital
Amount		14,282,492			11,812,114			501,111
Ratio(a)		14.09	%		11.70	%		57.57	%
Leverage
Amount		12,083,948			10,115,688			496,801
Ratio(b)		9.99	%		8.41	%		15.31	%

(a) The ratio of capital to risk-weighted assets, as defined by regulation.

(b) The ratio of capital to average assets, as defined by regulation.