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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Webster Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 10	$ 10	$ 30	$ 30
Interest cost on projected benefit obligations	2,046	1,841	6,051	5,524
Expected return on plan assets	(2,871)	(2,779)	(8,621)	(8,336)
Amortization of prior service cost	0	0	0	0
Recognized net loss	711	1,590	2,086	4,767
Net periodic benefit cost (income)	(104)	662	(454)	1,985
Webster SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost on projected benefit obligations	89	72	273	217
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Recognized net loss	55	32	101	94
Net periodic benefit cost (income)	144	104	374	311
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost on projected benefit obligations	36	30	104	90
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	18	18	55	54
Recognized net loss	4	7	4	21
Net periodic benefit cost (income)	$ 58	$ 55	$ 163	$ 165