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Investment Securities (Schedule Of Investment Securities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | $ 801,147 | $ 1,274,258
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 19,530 | 34,740
Securities Available-for-Sale, Gross Unrealized Holding Losses | 32 | 11,476
Securities Available-for-Sale, Estimated Fair Value | 820,645 | 1,297,522
Securities Held-to-Maturity, Amortized Cost | 820,224 | 673,570
Securities Held-to-Maturity, Gross Unrealized Holding Gains | 14,382 | 17,164
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 32 | 4,620
Securities Held-to-Maturity, Estimated Fair Value | 834,574 | 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 | 370,043 | 272,301
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 1,614 | 2,968
Securities Available-for-Sale, Gross Unrealized Holding Losses |  | 1,956
Securities Available-for-Sale, Estimated Fair Value | 371,657 | 273,313
Obligations Of States And Political Subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | 2,616 | 10,815
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 44 | 281
Securities Available-for-Sale, Gross Unrealized Holding Losses |  | 52
Securities Available-for-Sale, Estimated Fair Value | 2,660 | 11,044
Securities Held-to-Maturity, Amortized Cost | 1,992 | 3,167
Securities Held-to-Maturity, Gross Unrealized Holding Gains | 5 | 7
Securities Held-to-Maturity, Gross Unrecognized Holding Losses |  |
Securities Held-to-Maturity, Estimated Fair Value | 1,997 | 3,174
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Amortized Cost | 427,300 | 990,204
Securities Available-for-Sale, Gross Unrealized Holdings Gains | 16,995 | 30,633
Securities Available-for-Sale, Gross Unrealized Holding Losses |  | 9,425
Securities Available-for-Sale, Estimated Fair Value | 444,295 | 1,011,412
Securities Held-to-Maturity, Amortized Cost | 818,232 | 670,403
Securities Held-to-Maturity, Gross Unrealized Holding Gains | 14,377 | 17,157
Securities Held-to-Maturity, Gross Unrecognized Holding Losses | 32 | 4,620
Securities Held-to-Maturity, Estimated Fair Value | 832,577 | 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 | 877 | 858
Securities Available-for-Sale, Gross Unrealized Holding Losses | 32 | 43
Securities Available-for-Sale, Estimated Fair Value | $ 2,033 | $ 1,753

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