Securities (Summary Of Contractual Maturity Information For Securities Available For Sale) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Securities [Abstract]
Due in 1 year or less, Amortized Cost	$ 792,158
Due after 1 year through 5 years, Amortized Cost	2,166,689
Due after 5 years through 10 years, Amortized Cost	495,313
Due after 10 years, Amortized Cost	88,464
Total, Amortized Cost	3,542,624
Due in 1 year or less, Fair Value	796,967
Due after 1 year through 5 years, Fair Value	2,206,866
Due after 5 years through 10 years, Fair Value	520,474
Due after 10 years, Fair Value	91,227
Total, Fair Value	3,615,534
Mortgage-backed Securities, Amortized Cost	2,437,282
Mortgage-backed Securities, Fair Value	2,492,348
Total securities available for sale, Amortized Cost	5,979,906
Total securities available for sale, Fair Value	$ 6,107,882	$ 5,613,047

Mortgage-backed securities available-for-sale, amortized cost.

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