XML 24 R1.htm IDEA: XBRL DOCUMENT v3.25.4
Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2025
Feb. 20, 2026
Jun. 30, 2025
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Current Fiscal Year End Date --12-31    
Document Period End Date Dec. 31, 2025    
Document Transition Report false    
Entity File Number 001-31486    
Entity Registrant Name WEBSTER FINANCIAL CORPORATION    
Entity Incorporation, State or Country Code DE    
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    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 9.1
Entity Common Stock, Shares Outstanding   161,226,585  
Documents Incorporated by Reference The information required by Part III is incorporated by reference to our definitive proxy statement or in an amendment to the Form 10-K, to be filed no later than 120 days after the end of the fiscal year covered by this Form 10-K.]    
Amendment Flag false    
Entity Central Index Key 0000801337    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2025    
Common Class A      
Entity Information [Line Items]      
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol WBS    
Security Exchange Name NYSE    
Preferred Stock Series F Issued      
Entity Information [Line Items]      
Title of 12(b) Security Depositary Shares, each representing 1/1000th interest in a share    
Trading Symbol WBS-PrF    
Security Exchange Name NYSE    
Preferred Stock Series G Issued      
Entity Information [Line Items]      
Title of 12(b) Security Depositary Shares, each representing 1/40th interest in a share    
Trading Symbol WBS-PrG    
Security Exchange Name NYSE