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Investment Securities (Schedule Of Investment Securities) (Details) (USD $) In Thousands | Sep. 30, 2011 | Dec. 31, 2010
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Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | $ 772,910 | $ 1,274,258
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 24,284 | 34,740
Securities Available-for-Sale, Gross Unrealized Holding Losses | 31 | 11,476
Securities Available-for-Sale, Estimated Fair Value | 797,163 | 1,297,522
Securities Held-to-Maturity, Amortized Cost | 843,576 | 673,570
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 17,978 | 17,164
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 185 | 4,620
Securities Held-to-Maturity, Estimated Fair Value | 861,369 | 686,114
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | 223,459 | 272,301
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 1,358 | 2,968
Securities Available-for-Sale, Gross Unrealized Holding Losses |  | 1,956
Securities Available-for-Sale, Estimated Fair Value | 224,817 | 273,313
Obligations Of States And Political Subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | 3,615 | 10,815
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 109 | 281
Securities Available-for-Sale, Gross Unrealized Holding Losses |  | 52
Securities Available-for-Sale, Estimated Fair Value | 3,724 | 11,044
Securities Held-to-Maturity, Amortized Cost | 1,992 | 3,167
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 7 | 7
Securities Held-to-Maturity, Estimated Fair Value | 1,999 | 3,174
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | 544,648 | 990,204
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 22,100 | 30,633
Securities Available-for-Sale, Gross Unrealized Holding Losses |  | 9,425
Securities Available-for-Sale, Estimated Fair Value | 566,748 | 1,011,412
Securities Held-to-Maturity, Amortized Cost | 841,584 | 670,403
Securities Held-to-Maturity, Gross Unrecognized Holding Gains | 17,971 | 17,157
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 185 | 4,620
Securities Held-to-Maturity, Estimated Fair Value | 859,370 | 682,940
Other Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | 1,188 | 938
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 717 | 858
Securities Available-for-Sale, Gross Unrealized Holding Losses | 31 | 43
Securities Available-for-Sale, Estimated Fair Value | $ 1,874 | $ 1,753

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