Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	$ 569,469	$ 193,189
Securities Available-for-Sale, Less than 12 months, Unrealized losses	4,602	223
Securities Available-for-Sale, 12 months or longer, Fair value	339,019	558,570
Securities Available-for-Sale, 12 months or longer, Unrealized losses	7,041	12,852
Securities Available-for-Sale, Fair value, Total	908,488	751,759
Securities Available-for-Sale, Unrealized losses, Total	11,643	13,075
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	376,247	119,913
Securities Available-for-Sale, Less than 12 months, Unrealized losses	3,753	87
Securities Available-for-Sale, 12 months or longer, Fair value	212,672	388,140
Securities Available-for-Sale, 12 months or longer, Unrealized losses	4,215	8,746
Securities Available-for-Sale, Fair value, Total	588,919	508,053
Securities Available-for-Sale, Unrealized losses, Total	7,968	8,833
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	193,222	73,276
Securities Available-for-Sale, Less than 12 months, Unrealized losses	849	136
Securities Available-for-Sale, 12 months or longer, Fair value	126,347	170,430
Securities Available-for-Sale, 12 months or longer, Unrealized losses	2,826	4,106
Securities Available-for-Sale, Fair value, Total	319,569	243,706
Securities Available-for-Sale, Unrealized losses, Total	3,675	4,242
Securities Held-to-Maturity, Less than 12 months, Fair value	18,841	8,032
Securities Held-to-Maturity, Less than 12 months, Unrealized losses	20	148
Securities Held-to-Maturity, 12 months or longer, Fair value	7,931	2,714
Securities Held-to-Maturity, 12 months or longer, Unrealized losses	113	12
Securities Held-to-Maturity, Fair value, Total	26,772	10,746
Securities Held-to-Maturity, Unrealized losses, Total	$ 133	$ 160

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

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