Long-Term Debt (Schedule Of Long-Term Debt) (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
Total notes and subordinated debt	$ 227,320		$ 329,899
Unamortized discount, net	(56)		(93)
Hedge accounting adjustments	2,664		4,470
Total long-term debt	229,928		334,276
Senior fixed-rate notes [Member]
Debt Instrument [Line Items]
Maturity date	Jan. 01, 2014
Stated interest rate	5.125%
Senior fixed-rate notes	150,000		150,000
Subordinated fixed-rate notes [Member]
Debt Instrument [Line Items]
Maturity date	Jan. 01, 2013	[1]
Stated interest rate	5.875%	[1]
Subordinated Long-term Debt, Noncurrent	0	[1]	102,579	[1]
Junior subordinated debt Webster Statutory Trust I floating-rate notes[Member]
Debt Instrument [Line Items]
Maturity date	Jan. 01, 2033	[2]
Variable interest rate	3.223%	[2]	3.258%
Total junior subordinated debt	$ 77,320	[2]	$ 77,320	[2]
Interest rate spread of LIBOR plus	2.95%

[1] The Bank used cash on hand to pay off the subordinated fixed-rate notes which matured on January 15, 2013.

[2] The interest rate on Webster Statutory Trust I floating-rate notes, which varies quarterly based on 3-month LIBOR plus 2.95%, was 3.223% at June 30, 2013 and 3.258% at December 31, 2012.