Pension And Other Postretirement Benefits (Summary Of Weighted-Average Assumptions To Determine Benefit Obligations) (Details)	Dec. 31, 2011	Dec. 31, 2010
Webster Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.35%	5.50%
Rate of compensation increase	0.00%	0.00%
Webster SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.00%	5.10%
Rate of compensation increase	0.00%	0.00%
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.60%	4.55%
Rate of compensation increase	0.00%	0.00%