Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
Sep. 30, 2014	Dec. 31, 2013
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value		$ 781,661
Securities Available-for-Sale, Less than 12 months, Unrealized losses		38,173
Securities Available-for-Sale, 12 months or longer, Fair value	740,275	169,082
Securities Available-for-Sale, 12 months or longer, Unrealized losses	25,402	17,313
Securities Available-for-Sale, Fair value, Total	740,275	950,743
Securities Available-for-Sale, Unrealized losses, Total	25,402	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		377,626
Securities Available-for-Sale, Less than 12 months, Unrealized losses		29,256
Securities Available-for-Sale, 12 months or longer, Fair value	551,159	147,510
Securities Available-for-Sale, 12 months or longer, Unrealized losses	19,476	16,240
Securities Available-for-Sale, Fair value, Total	551,159	525,136
Securities Available-for-Sale, Unrealized losses, Total	19,476	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		404,035
Securities Available-for-Sale, Less than 12 months, Unrealized losses		8,917
Securities Available-for-Sale, 12 months or longer, Fair value	189,116	21,572
Securities Available-for-Sale, 12 months or longer, Unrealized losses	5,926	1,073
Securities Available-for-Sale, Fair value, Total	189,116	425,607
Securities Available-for-Sale, Unrealized losses, Total	5,926	9,990
Securities Held-to-Maturity, Less than 12 months, Fair value	65,552	5,781
Securities Held-to-Maturity, Less than 12 months, Unrealized losses	430	42
Securities Held-to-Maturity, 12 months or longer, Fair value	3,342
Securities Held-to-Maturity, 12 months or longer, Unrealized losses	32
Securities Held-to-Maturity, Fair value, Total	68,894	5,781
Securities Held-to-Maturity, Unrealized losses, Total	$ 462	$ 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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