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Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Gain (Loss) on Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value | $ 482,971 | $ 494,068
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 4,856 | 11,462
Securities Available-for-Sale, 12 months or longer, Fair value | 215 | 221
Securities Available-for-Sale, 12 months or longer, Unrealized losses | 13 | 14
Securities Available-for-Sale, Fair value, Total | 483,186 | 494,289
Securities Available-for-Sale, Unrealized losses, Total | 4,869 | 11,476
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value | 74,936 | 74,379
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 1,399 | 1,956
Securities Available-for-Sale, Fair value, Total | 74,936 | 74,379
Securities Available-for-Sale, Unrealized losses, Total | 1,399 | 1,956
Obligations Of States And Political Subdivisions [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value |  | 1,459
Securities Available-for-Sale, Less than 12 months, Unrealized losses |  | 52
Securities Available-for-Sale, Fair value, Total |  | 1,459
Securities Available-for-Sale, Unrealized losses, Total |  | 52
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value | 407,954 | 418,156
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 3,427 | 9,425
Securities Available-for-Sale, Fair value, Total | 407,954 | 418,156
Securities Available-for-Sale, Unrealized losses, Total | 3,427 | 9,425
Securities Held-to-Maturity, Less than 12 months, Fair value | 312,382 | 297,584
Securities Held-to-Maturity, Less than 12 months, Unrealized losses | 5,177 | 4,620
Securities Held-to-Maturity, Fair value, Total | 312,382 | 297,584
Securities Held-to-Maturity, Unrealized losses, Total | 5,177 | 4,620
Other Equity Securities [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value | 81 | 74
Securities Available-for-Sale, Less than 12 months, Unrealized losses | 30 | 29
Securities Available-for-Sale, 12 months or longer, Fair value | 215 | 221
Securities Available-for-Sale, 12 months or longer, Unrealized losses | 13 | 14
Securities Available-for-Sale, Fair value, Total | 296 | 295
Securities Available-for-Sale, Unrealized losses, Total | $ 43 | $ 43

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