Regulatory Matters (Information On The Capital Ratios) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Dividends paid by Webster Bank	$ 90,000,000	$ 140,000,000
Trust Preferred Securities Included in Tier One Capital	75,000,000	75,000,000
Webster Financial Corporation [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital, Actual Amount	1,965,171,000	1,840,736,000
Total risk-based capital, Actual Ratio	14.20%	13.70%
Total risk-based capital, Capital Requirements Amount	1,106,203,000	1,072,749,000
Total risk-based capital, Capital Requirements Ratio	8.00%	8.00%
Total risk-based capital, Well Capitalized Amount	1,382,754,000	1,340,936,000
Total risk-based capital, Well Capitalized Ratio	10.00%	10.00%
Tier 1 capital, Actual Amount	1,807,642,000	1,672,009,000
Tier 1 capital, Actual Ratio	13.10%	12.50%
Tier 1 capital, Capital Requirements Amount	553,101,000	536,375,000
Tier 1 capital, Capital Requirements Ratio	4.00%	4.00%
Tier 1 capital, Well Capitalized Amount	829,652,000	804,562,000
Tier 1 capital, Well Capitalized Ratio	6.00%	6.00%
Tier 1 leverage capital ratio, Actual Amount	1,807,642,000	1,672,009,000
Tier 1 leverage capital ratio, Actual Ratio	9.00%	8.70%
Tier 1 leverage capital ratio, Capital Requirements Amount	801,535,000	767,289,000
Tier 1 leverage capital ratio, Capital Requirements Ratio	4.00%	4.00%
Tier 1 leverage capital ratio, Well Capitalized Amount	1,001,919,000	959,111,000
Tier 1 leverage capital ratio, Well Capitalized Ratio	5.00%	5.00%
Webster Bank, N.A. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital, Actual Amount	1,815,423,000	1,718,564,000
Total risk-based capital, Actual Ratio	13.20%	12.90%
Total risk-based capital, Capital Requirements Amount	1,104,200,000	1,069,652,000
Total risk-based capital, Capital Requirements Ratio	8.00%	8.00%
Total risk-based capital, Well Capitalized Amount	1,380,250,000	1,337,064,000
Total risk-based capital, Well Capitalized Ratio	10.00%	10.00%
Tier 1 capital, Actual Amount	1,658,466,000	1,551,238,000
Tier 1 capital, Actual Ratio	12.00%	11.60%
Tier 1 capital, Capital Requirements Amount	552,100,000	534,826,000
Tier 1 capital, Capital Requirements Ratio	4.00%	4.00%
Tier 1 capital, Well Capitalized Amount	828,150,000	802,239,000
Tier 1 capital, Well Capitalized Ratio	6.00%	6.00%
Tier 1 leverage capital ratio, Actual Amount	1,658,466,000	1,551,238,000
Tier 1 leverage capital ratio, Actual Ratio	8.30%	8.10%
Tier 1 leverage capital ratio, Capital Requirements Amount	800,063,000	766,025,000
Tier 1 leverage capital ratio, Capital Requirements Ratio	4.00%	4.00%
Tier 1 leverage capital ratio, Well Capitalized Amount	$ 1,000,079,000	$ 957,532,000
Tier 1 leverage capital ratio, Well Capitalized Ratio	5.00%	5.00%