Pension and Other Postretirement Benefits (Summary of Net Periodic Benefit Costs) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Webster Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost (benefits earned during the period)	$ 10	$ (29)	$ 20	$ 15
Interest cost on benefit obligations	1,871	1,838	3,683	3,653
Expected return on plan assets	(2,782)	(2,513)	(5,557)	(5,034)
Amortization of prior service cost	0	0	0	0
Recognized net loss	1,637	1,464	3,177	3,051
Net periodic benefit cost recognized in net income	736	760	1,323	1,685
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	71	78	145	158
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Recognized net loss	31	15	62	35
Net periodic benefit cost recognized in net income	102	93	207	193
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	60	88
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	18	18	36	36
Recognized net loss	7	25	14	51
Net periodic benefit cost recognized in net income	$ 55	$ 87	$ 110	$ 175