Goodwill And Other Intangible Assets (Gross Carrying Value And Accumulated Amortization Of Other Intangible Assets) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 54,119	$ 54,119
Accumulated Amortization	(42,607)	(38,429)
Net Carrying Amount	11,512	15,690
Retail Banking [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	49,420	49,420
Accumulated Amortization	(37,908)	(34,182)
Net Carrying Amount	11,512	15,238
Other (HSA Bank) [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,699	4,699
Accumulated Amortization	(4,699)	(4,247)
Net Carrying Amount	$ 0	$ 452