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Investment Securities (Amortized Cost And Estimated Fair Value Of Investments In Debt Securities By Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2011 | Dec. 31, 2010
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Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Total, Fair value | $ 797,163 | $ 1,297,522
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Due within one year, Amortized cost | 223,459 |
Securities Available-for-Sale, Due within one year, Fair value | 224,817 |
Securities Available-for-Sale, Total, Amortized cost | 223,459 |
Securities Available-for-Sale, Total, Fair value | 224,817 | 273,313
Obligations Of States And Political Subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Due within one year, Amortized cost | 2,315 |
Securities Available-for-Sale, Due within one year, Fair value | 2,327 |
Securities Available-for-Sale, Due one through five years, Amortized cost | 1,300 |
Securities Available-for-Sale, Due one through five years, Fair value | 1,397 |
Securities Available-for-Sale, Total, Amortized cost | 3,615 |
Securities Available-for-Sale, Total, Fair value | 3,724 | 11,044
Securities Held-to-Maturity, Due within one year, Amortized cost | 1,992 |
Securities Held-to-Maturity, Due within one year, Fair value | 1,999 |
Securities Held-to-Maturity, Total, Amortized cost | 1,992 |
Securities Held-to-Maturity, Total, Fair value | 1,999 |
U.S. Government Sponsored Entities Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Securities Available-for-Sale, Total, Amortized cost | 544,648 |
Securities Available-for-Sale, Total, Fair value | 566,748 | 1,011,412
Securities Held-to-Maturity, Total, Amortized cost | 841,584 |
Securities Held-to-Maturity, Total, Fair value | $ 859,370 |

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