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Securities (Amortized Cost And Fair Value Of Securities, By Contractual Maturities) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
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Schedule of Held-to-maturity Securities [Line Items] |  |
Available for Sale, Due in one year or less, Amortized Cost | $ 27,164 |
Available for Sale, Due in one year or less, Fair Value | 27,213 |
Available for Sale, Due from one to five years, Amortized Cost | 346,262 |
Available for Sale, Due from one to five years, Fair Value | 346,200 |
Available for Sale, Due from five to ten years, Amortized Cost | 21,405 |
Available for Sale, Due from five to ten years, Fair Value | 22,401 |
Available for Sale, Due after ten years, Amortized Cost | 64,617 |
Available for Sale, Due after ten years, Fair Value | 50,753 |
Available for Sale, with contractual maturities, Amortized Cost | 459,448 |
Available for Sale, with contractual maturities, Fair Value | 446,567 |
Total securities available for sale, Amortized Cost | 1,101,523 | 645,658
Total available for sale Securities, Fair Value | 1,097,801 | 640,571
Held to Maturity, Due in one year or less, Amortized Cost | 7,731 |
Held to Maturity, Due in one year or less, Fair Value | 7,826 |
Held to Maturity, Due from one to five years, Amortized Cost | 12,313 |
Held to Maturity, Due from one to five years, Fair Value | 12,873 |
Held to Maturity, Due from five to ten years, Amortized Cost | 43,678 |
Held to Maturity, Due from five to ten years, Fair Value | 45,470 |
Held to Maturity, Due after ten years, Amortized Cost | 91,596 |
Held to Maturity, Due after ten years, Fair Value | 95,445 |
Held to Maturity, Amortized Cost, total | 1,178,558 | 917,212
Securities Held To Maturity, Fair Value | 1,212,826 | 952,033
Held to Maturity, with contractual maturities, Amortized Cost | 155,318 |
Held to Maturity, with contractual maturities, Fair Value | 161,614 |
Agency Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total securities available for sale, Amortized Cost | 337,045 | 166,758
Total available for sale Securities, Fair Value | 342,654 | 171,611
Held to Maturity, with contractual maturities, Amortized Cost | 888,484 |
Held to Maturity, with contractual maturities, Fair Value | 917,019 |
Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total securities available for sale, Amortized Cost | 299,109 | 181,493
Total available for sale Securities, Fair Value | 302,330 | 183,729
Held to Maturity, with contractual maturities, Amortized Cost | 115,104 |
Held to Maturity, with contractual maturities, Fair Value | 115,747 |
Non-Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total securities available for sale, Amortized Cost | 3,866 | 31
Total available for sale Securities, Fair Value | 3,842 | 30
Held to Maturity, with contractual maturities, Amortized Cost | 19,652 |
Held to Maturity, with contractual maturities, Fair Value | 18,446 |
Equity Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total securities available for sale, Amortized Cost | 2,055 | 1,593
Total available for sale Securities, Fair Value | $ 2,408 | $ 1,827

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