Goodwill And Other Intangible Assets (Goodwill And Other Intangible Assets, Net Of Accumulated Amortization) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill	$ 529,887	$ 529,887
Core Deposit Intangibles	2,666	5,351
Consumer Deposits [Member]
Goodwill [Line Items]
Goodwill	377,605	377,605
Core Deposit Intangibles	2,666	5,351
Business Banking [Member]
Goodwill [Line Items]
Goodwill	138,955	138,955
Core Deposit Intangibles	0	0
Community Banking [Member]
Goodwill [Line Items]
Goodwill	516,560	516,560
Core Deposit Intangibles	2,666	5,351
Other (HSA Bank) [Member]
Goodwill [Line Items]
Goodwill	13,327	13,327
Core Deposit Intangibles	$ 0	$ 0