Fair Values (Schedule of Losses Resulting From Nonrecurring Fair Value Adjustments) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Total loss from nonrecurring measurements	$ 69,898	$ 125,669	$ 321,147
Residential Mortgage-Backed Securities And Collateralized Mortgage Obligations [Member]
Loss from nonrecurring measurements	359	414	10,334
Non-Covered Loans [Member]
Loss from nonrecurring measurements	51,883	119,240	185,810
Goodwill [Member]
Loss from nonrecurring measurements			111,952
Other Intangible Assets, Net [Member]
Loss from nonrecurring measurements			804
Non-Covered Other Real Estate Owned [Member]
Loss from nonrecurring measurements	8,947	4,074	12,247
Covered Other Real Estate Owned [Member]
Loss from nonrecurring measurements	$ 8,709	$ 1,941