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Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
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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

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