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Investment Securities (Schedule Of Investment Securities) (Details) (USD $) In Thousands | Jun. 30, 2011 | Dec. 31, 2010
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Securities Available-for-Sale, Amortized Cost | $ 1,107,211 | $ 1,274,258
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 15,055 | 34,740
Securities Available-for-Sale, Gross Unrealized Holding Losses | 4,869 | 11,476
Securities Available-for-Sale, Estimated Fair Value | 1,117,397 | 1,297,522
Securities Held-to-Maturity, Amortized Cost | 775,311 | 673,570
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 16,088 | 17,164
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 5,177 | 4,620
Securities Held-to-Maturity, Estimated Fair Value | 786,222 | 686,114
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] |  |
Securities Available-for-Sale, Amortized Cost | 308,300 | 272,301
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 1,754 | 2,968
Securities Available-for-Sale, Gross Unrealized Holding Losses | 1,399 | 1,956
Securities Available-for-Sale, Estimated Fair Value | 308,655 | 273,313
Obligations Of States And Political Subdivisions [Member] |  |
Securities Available-for-Sale, Amortized Cost | 4,996 | 10,815
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 113 | 281
Securities Available-for-Sale, Gross Unrealized Holding Losses |  | 52
Securities Available-for-Sale, Estimated Fair Value | 5,109 | 11,044
Securities Held-to-Maturity, Amortized Cost | 2,077 | 3,167
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 5 | 7
Securities Held-to-Maturity, Estimated Fair Value | 2,082 | 3,174
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Securities Available-for-Sale, Amortized Cost | 792,977 | 990,204
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 12,374 | 30,633
Securities Available-for-Sale, Gross Unrealized Holding Losses | 3,427 | 9,425
Securities Available-for-Sale, Estimated Fair Value | 801,924 | 1,011,412
Securities Held-to-Maturity, Amortized Cost | 773,234 | 670,403
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 16,083 | 17,157
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 5,177 | 4,620
Securities Held-to-Maturity, Estimated Fair Value | 784,140 | 682,940
Other Equity Securities [Member] |  |
Securities Available-for-Sale, Amortized Cost | 938 | 938
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 814 | 858
Securities Available-for-Sale, Gross Unrealized Holding Losses | 43 | 43
Securities Available-for-Sale, Estimated Fair Value | $ 1,709 | $ 1,753

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