Investment Securities (Schedule Of Realized Gross Gains And Losses On Sale From Available For Sale Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Available-for-sale Securities, Gross Realized Gains	$ 0		$ 35,162	[1]	$ 5,433		$ 44,584	[1]
Gross (losses) on sales of securities	0		0		0		(8,623)
Net gain/(loss) on sales of securities	0	[2]	35,162	[2]	5,433	[2]	35,961	[2]
Venture capital investments	0		0		0		0
Net other than temporary impairment ("OTTI") recorded	0		0		(40)		0
Total securities gain/ (loss), net	0		35,162		5,393		35,961
Proceeds from sales of available-for-sale securities	0		35,200		47,493		493,591
Visa Class B Shares [Member]
Available-for-sale Securities, Gross Realized Gains					$ 35,100

[1] Three and nine months ended September 30, 2011 include gain of $35.1 million related to sale of Visa Class B shares.

[2] There were no proceeds from sales for the three months ended September 30, 2012. Proceeds from sales for the three months ended September 30, 2011 were $35.2 million, and were $47.5 million and $493.6 million for the nine months ended September 30, 2012 and 2011, respectively.