Investment Securities (Amount Of Noncredit-Related OTTI Recognized In OCI) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Investment Securities [Abstract]
HTM	$ 20,945		$ 583
AFS	22,697	71,097	288,820
Total	43,642	71,097	289,403
Total noncredit-related OTTI, after-tax	$ 26,481	$ 43,920	$ 174,244

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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The amount by which the fair value of an investment in debt securities categorized as Held-to-maturity is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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