Goodwill And Other Intangible Assets (Goodwill And Other Intangible Assets, Net Of Accumulated Amortization) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Goodwill [Line Items]
Goodwill	$ 529,887	$ 529,887
Other intangible assets	11,512	15,690
Total goodwill and other intangible assets	541,399	545,577
Retail Banking [Member]
Goodwill [Line Items]
Goodwill	516,560	516,560
Other intangible assets	11,512	15,238
Other (HSA Bank) [Member]
Goodwill [Line Items]
Goodwill	13,327	13,327
Other intangible assets	$ 0	$ 452