Pension And Other Postretirement Benefits (Summary Of Components Of Accumulated Other Comprehensive Loss On A Pre-Tax Basis)(Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ (6,500,000)
Prior service cost	73,000
Webster Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	70,547,000	36,950,000
Total pre-tax amounts recognized in accumulated other comprehensive loss	70,547,000	36,950,000
Webster SERP [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	1,423,000	663,000
Total pre-tax amounts recognized in accumulated other comprehensive loss	1,423,000	663,000
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	1,396,000	1,009,000
Prior service cost	305,000	378,000
Total pre-tax amounts recognized in accumulated other comprehensive loss	$ 1,701,000	$ 1,387,000