Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2014	Dec. 31, 2013
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	$ 577,437	$ 781,661
Securities Available-for-Sale, Less than 12 months, Unrealized losses	23,857	38,173
Securities Available-for-Sale, 12 months or longer, Fair value	231,912	169,082
Securities Available-for-Sale, 12 months or longer, Unrealized losses	15,830	17,313
Securities Available-for-Sale, Fair value, Total	809,349	950,743
Securities Available-for-Sale, Unrealized losses, Total	39,687	55,486
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	328,241	377,626
Securities Available-for-Sale, Less than 12 months, Unrealized losses	16,750	29,256
Securities Available-for-Sale, 12 months or longer, Fair value	210,775	147,510
Securities Available-for-Sale, 12 months or longer, Unrealized losses	14,867	16,240
Securities Available-for-Sale, Fair value, Total	539,016	525,136
Securities Available-for-Sale, Unrealized losses, Total	31,617	45,496
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	249,196	404,035
Securities Available-for-Sale, Less than 12 months, Unrealized losses	7,107	8,917
Securities Available-for-Sale, 12 months or longer, Fair value	21,137	21,572
Securities Available-for-Sale, 12 months or longer, Unrealized losses	963	1,073
Securities Available-for-Sale, Fair value, Total	270,333	425,607
Securities Available-for-Sale, Unrealized losses, Total	8,070	9,990
Securities Held-to-Maturity, Less than 12 months, Fair value	90,751	5,781
Securities Held-to-Maturity, Less than 12 months, Unrealized losses	495	42
Securities Held-to-Maturity, 12 months or longer, Fair value
Securities Held-to-Maturity, 12 months or longer, Unrealized losses
Securities Held-to-Maturity, Fair value, Total	90,751	5,781
Securities Held-to-Maturity, Unrealized losses, Total	$ 495	$ 42

Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer.

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-Name Accounting Standards Codification

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