v3.25.2
Cover
Jul. 16, 2025
Document Information [Line Items]  
Document Type 8-K
Document Period End Date Jul. 16, 2025
Entity Registrant Name M&T BANK CORPORATION
Entity Incorporation, State or Country Code NY
Entity Tax Identification Number 16-0968385
Entity File Number 1-9861
Entity Address, Postal Zip Code 14203
Entity Address, Address Line One One M&T Plaza
Entity Address, City or Town Buffalo
Entity Address, State or Province NY
Local Phone Number 635-4000
City Area Code 716
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Amendment Flag false
Entity Central Index Key 0000036270
Common Stock  
Document Information [Line Items]  
Title of 12(b) Security Common Stock, $.50 par value
Trading Symbol MTB
Security Exchange Name NYSE
Perpetual Fixed-to-Floating Rate Non-Cumulative Preferred Stock, Series H  
Document Information [Line Items]  
Title of 12(b) Security Perpetual Fixed-to-Floating RateNon-Cumulative Preferred Stock, Series H
Trading Symbol MTBPrH
Security Exchange Name NYSE
Perpetual Fixed-to-Floating Rate Non-Cumulative Preferred Stock, Series J  
Document Information [Line Items]  
Title of 12(b) Security Perpetual Fixed Rate Non-CumulativePreferred Stock, Series J
Trading Symbol MTBPrJ
Security Exchange Name NYSE