Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 31, 2014
Document Documentand Entity Information [Abstract]
Amendment Description	Explanatory Note The Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2014 filed by Webster Financial Corporation (the “Company”) with the Securities and Exchange Commission on November 5, 2014 inadvertently omitted the following exhibits: EXHIBIT 31.1 Certification of the Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. EXHIBIT 31.2 Certification of the Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. EXHIBIT 32.1 Certification of the Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. EXHIBIT 32.2 Certification of the Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. The exhibits are included with this Amendment No. 1 to Quarterly Report on Form 10-Q/A. No revisions are being made to the Company's Form 10-Q except for the filing of the exhibits listed above. This amendment does not reflect events occurring after the filing of the Form 10-Q, or modify or update those disclosures that may be affected by subsequent events, and no other changes are being made to any other disclosure contained in the Form 10-Q.
Document Type	10-Q
Amendment Flag	true
Document Period End Date	Sep. 30, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q3
Trading Symbol	WBS
Entity Registrant Name	WEBSTER FINANCIAL CORP
Entity Central Index Key	0000801337
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		90,245,947