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Pension And Other Postretirement Benefits (Summary Of Weighted-Average Assumptions To Determine Net Periodic Benefit Cost) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Expected long-term return on assets	7.75%
Assumed healthcare cost trend	8.00%
Webster Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.50%	5.95%	6.00%
Expected long-term return on assets	7.75%	8.00%	8.00%
Rate of compensation increase	0.00%	0.00%	0.00%
Assumed healthcare cost trend	0.00%	0.00%	0.00%
Webster SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.10%	5.75%	6.40%
Expected long-term return on assets	0.00%	0.00%	0.00%
Rate of compensation increase	0.00%	0.00%	0.00%
Assumed healthcare cost trend	0.00%	0.00%	0.00%
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.55%	5.25%	6.30%
Expected long-term return on assets	0.00%	0.00%	0.00%
Rate of compensation increase	0.00%	0.00%	0.00%
Assumed healthcare cost trend	8.00%	8.00%	8.00%

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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- Definition

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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