Pension and Other Postretirement Benefits (Summary of Net Periodic Benefit Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Webster Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	$ 10	$ 7	$ 30	$ 22
Interest cost on benefit obligations	1,841	1,827	5,524	5,480
Expected return on plan assets	(2,779)	(2,517)	(8,336)	(7,551)
Amortization of prior service cost	0	0	0	0
Recognized net loss	1,590	1,525	4,767	4,576
Net periodic benefit cost recognized in net income	662	842	1,985	2,527
Supplemental Employee Retirement Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	0	0	0	0
Interest cost on benefit obligations	72	79	217	237
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Recognized net loss	32	18	94	53
Net periodic benefit cost recognized in net income	104	97	311	290
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	0	0	0	0
Interest cost on benefit obligations	30	44	90	132
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	18	18	54	54
Recognized net loss	7	26	21	77
Net periodic benefit cost recognized in net income	$ 55	$ 88	$ 165	$ 263