v3.26.1
Document and Entity Information
May 18, 2026
Document And Entity Information [Line Items]  
Entity Registrant Name WEBSTER FINANCIAL CORP
Amendment Flag false
Entity Central Index Key 0000801337
Document Type 8-K
Document Period End Date May 18, 2026
Entity Incorporation State Country Code DE
Entity File Number 001-31486
Entity Tax Identification Number 06-1187536
Entity Address, Address Line One 200 Elm Street
Entity Address, City or Town Stamford
Entity Address, State or Province CT
Entity Address, Postal Zip Code 06902
City Area Code (203)
Local Phone Number 578-2202
Written Communications true
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, par value $0.01 per share
Trading Symbol WBS
Security Exchange Name NYSE
Series F Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Depositary Shares, each representing a 1/1000th interest in a share of 5.25% Series F Non-Cumulative Perpetual Preferred Stock
Trading Symbol WBS-PrF
Security Exchange Name NYSE
Series G Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Depositary Shares, each representing a 1/40th interest in a share of 6.50% Series G Non-Cumulative Perpetual Preferred Stock
Trading Symbol WBS-PrG
Security Exchange Name NYSE