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Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value | $ 559,133 | $ 301,101
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 3,315 | 1,727
Securities Available-for-Sale, 12 months or longer, Fair value |  |
Securities Available-for-Sale, 12 months or longer, Unrealized losses |  |
Securities Available-for-Sale, Fair value, Total | 559,133 | 301,101
Securities Available-for-Sale, Unrealized losses, Total | 3,315 | 1,727
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 | 387,683 | 177,470
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 2,957 | 1,280
Securities Available-for-Sale, 12 months or longer, Fair value |  |
Securities Available-for-Sale, 12 months or longer, Unrealized losses |  |
Securities Available-for-Sale, Fair value, Total | 387,683 | 177,470
Securities Available-for-Sale, Unrealized losses, Total | 2,957 | 1,280
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value | 171,450 | 123,631
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 358 | 447
Securities Available-for-Sale, 12 months or longer, Fair value |  |
Securities Available-for-Sale, 12 months or longer, Unrealized losses |  |
Securities Available-for-Sale, Fair value, Total | 171,450 | 123,631
Securities Available-for-Sale, Unrealized losses, Total | 358 | 447
Securities Held-to-Maturity, Less than 12 months, Fair value |  | 10,120
Securities Held-to-Maturity, Less than 12 months, Unrealized losses |  | 38
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 |  | 10,120
Securities Held-to-Maturity, Unrealized losses, Total |  | $ 38

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