Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
Jun. 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	748,503	169,082
Securities Available-for-Sale, 12 months or longer, Unrealized losses	24,084	17,313
Securities Available-for-Sale, Fair value, Total	748,503	950,743
Securities Available-for-Sale, Unrealized losses, Total	24,084	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	551,936	147,510
Securities Available-for-Sale, 12 months or longer, Unrealized losses	18,698	16,240
Securities Available-for-Sale, Fair value, Total	551,936	525,136
Securities Available-for-Sale, Unrealized losses, Total	18,698	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	196,567	21,572
Securities Available-for-Sale, 12 months or longer, Unrealized losses	5,386	1,073
Securities Available-for-Sale, Fair value, Total	196,567	425,607
Securities Available-for-Sale, Unrealized losses, Total	5,386	9,990
Securities Held-to-Maturity, Less than 12 months, Fair value	20,577	5,781
Securities Held-to-Maturity, Less than 12 months, Unrealized losses	228	42
Securities Held-to-Maturity, 12 months or longer, Fair value	3,800
Securities Held-to-Maturity, 12 months or longer, Unrealized losses	28
Securities Held-to-Maturity, Fair value, Total	24,377	5,781
Securities Held-to-Maturity, Unrealized losses, Total	$ 256	$ 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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