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Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) (USD $) In Thousands | Sep. 30, 2011 | Dec. 31, 2010
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Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value |  | $ 494,068
Securities Available-for-Sale, Less than 12 months, Unrealized losses |  | 11,462
Securities Available-for-Sale, 12 months or longer, Fair value |  | 221
Securities Available-for-Sale, 12 months or longer, Unrealized losses |  | 14
Securities Available-for-Sale, Fair value, Total |  | 494,289
Securities Available-for-Sale, Unrealized losses, Total |  | 11,476
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 |  | 74,379
Securities Available-for-Sale, Less than 12 months, Unrealized losses |  | 1,956
Securities Available-for-Sale, Fair value, Total |  | 74,379
Securities Available-for-Sale, Unrealized losses, Total |  | 1,956
Obligations Of States And Political Subdivisions [Member] |  |
Schedule of 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] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value |  | 418,156
Securities Available-for-Sale, Less than 12 months, Unrealized losses |  | 9,425
Securities Available-for-Sale, Fair value, Total |  | 418,156
Securities Available-for-Sale, Unrealized losses, Total |  | 9,425
Securities Held-to-Maturity, Less than 12 months, Fair value | 107,352 | 297,584
Securities Held-to-Maturity, Less than 12 months, Unrealized losses | 185 | 4,620
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 | 107,352 | 297,584
Securities Held-to-Maturity, Unrealized losses, Total | 185 | 4,620
Other Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Less than 12 months, Fair value |  | 74
Securities Available-for-Sale, Less than 12 months, Unrealized losses |  | 29
Securities Available-for-Sale, 12 months or longer, Fair value | 80 | 221
Securities Available-for-Sale, 12 months or longer, Unrealized losses | 31 | 14
Securities Available-for-Sale, Fair value, Total | 80 | 295
Securities Available-for-Sale, Unrealized losses, Total | $ 31 | $ 43

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