Pension and Other Postretirement Benefits (Summary of weighted-Average Assumptions to Determine Net Periodic Benefit Cost) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Expected long-term return on assets	7.25%
Webster Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.90%	4.35%	5.50%
Expected long-term return on assets	7.25%	7.50%	7.75%
Webster SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.40%	4.00%	5.10%
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.85%	3.60%	4.55%
Assumed healthcare cost trend	8.00%	8.00%	8.00%