Regulatory matters (Tables)

12 Months Ended

Dec. 31, 2022

Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]

Summary of Required Minimum and Well Capitalized Capital Ratios

Pursuant to the rules in effect as of December 31, 2022, the required minimum and well capitalized capital ratios are as follows:

				Well
	Minimum			Capitalized
M&T (Consolidated)
Common equity Tier 1 ("CET1") to risk-weighted assets		4.5	%
Tier 1 capital to risk-weighted assets		6.0	%		6.0	%
Total capital to risk-weighted assets		8.0	%		10.0	%
Leverage — Tier 1 capital to average total assets, as defined		4.0	%
				Well
	Minimum			Capitalized
Bank Subsidiaries
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, 2022 and 2021 are presented below:

	M&T (Consolidated)			M&T Bank			Wilmington Trust, N.A.
	(Dollars in thousands)
December 31, 2022:
CET1 capital
Amount	$	15,562,037		$	16,673,578		$	585,968
Ratio(a)		10.44	%		11.23	%		254.50	%
Tier 1 capital
Amount		17,572,586			16,673,578			585,968
Ratio(a)		11.79	%		11.23	%		254.50	%
Total capital
Amount		20,259,735			18,887,691			586,879
Ratio(a)		13.60	%		12.72	%		254.90	%
Leverage
Amount		17,572,586			16,673,578			585,968
Ratio(b)		9.23	%		8.77	%		85.73	%
December 31, 2021:
CET1 capital
Amount	$	11,844,833		$	12,378,354		$	779,521
Ratio(a)		11.42	%		11.98	%		31.22	%
Tier 1 capital
Amount		13,594,782			12,378,354			779,521
Ratio(a)		13.11	%		11.98	%		31.22	%
Total capital
Amount		15,902,833			14,170,434			780,791
Ratio(a)		15.33	%		13.71	%		31.27	%
Leverage
Amount		13,594,782			12,378,354			779,521
Ratio(b)		8.87	%		8.11	%		6.23	%

(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.