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Document and Entity Information
Apr. 25, 2022
Document And Entity Information [Line Items]  
Entity Registrant Name M&T BANK CORP
Amendment Flag false
Entity Central Index Key 0000036270
Document Type 8-K
Document Period End Date Apr. 25, 2022
Entity Incorporation State Country Code NY
Entity File Number 1-9861
Entity Tax Identification Number 16-0968385
Entity Address, Address Line One One M&T Plaza
Entity Address, City or Town Buffalo
Entity Address, State or Province NY
Entity Address, Postal Zip Code 14203
City Area Code (716)
Local Phone Number 635-4000
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Stock, $.50 par value
Trading Symbol MTB
Security Exchange Name NYSE
Series H Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Perpetual Fixed-to-Floating Rate Non-Cumulative Preferred Stock, Series H
Trading Symbol MTBPrH
Security Exchange Name NYSE