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INVESTMENT SECURITIES (Details 3) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Continuous unrealized loss position, fair values of investment securities available-for-sale |  |
Continuous unrealized loss position less than 12 months, fair value | $ 527,308 | $ 1,108,347
Continuous unrealized loss position less than 12 months, unrealized losses | (16,087) | (63,558)
Continuous unrealized loss position 12 months or more, fair value | 328,479 | 359,776
Continuous unrealized loss position 12 months or more, unrealized losses | (41,656) | (44,188)
Continuous unrealized loss position total, fair value | 855,787 | 1,468,123
Continuous unrealized loss position total, unrealized losses | (57,743) | (107,746)
U.S. Treasury securities |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |
Continuous unrealized loss position less than 12 months, fair value | 30,468 |
Continuous unrealized loss position less than 12 months, unrealized losses | (25) |
Continuous unrealized loss position total, fair value | 30,468 |
Continuous unrealized loss position total, unrealized losses | (25) |
U.S. Government agency and U.S. Government sponsored enterprise debt securities |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |
Continuous unrealized loss position less than 12 months, fair value | 223,269 | 143,265
Continuous unrealized loss position less than 12 months, unrealized losses | (74) | (279)
Continuous unrealized loss position total, fair value | 223,269 | 143,265
Continuous unrealized loss position total, unrealized losses | (74) | (279)
U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |
Continuous unrealized loss position less than 12 months, fair value | 169,040 | 195,393
Continuous unrealized loss position less than 12 months, unrealized losses | (459) | (772)
Continuous unrealized loss position total, fair value | 169,040 | 195,393
Continuous unrealized loss position total, unrealized losses | (459) | (772)
Municipal securities |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |
Continuous unrealized loss position less than 12 months, fair value | 3,106 | 1,158
Continuous unrealized loss position less than 12 months, unrealized losses | (30) | (5)
Continuous unrealized loss position total, fair value | 3,106 | 1,158
Continuous unrealized loss position total, unrealized losses | (30) | (5)
Corporate debt securities | Investment grade |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |
Continuous unrealized loss position less than 12 months, fair value | 101,425 | 754,055
Continuous unrealized loss position less than 12 months, unrealized losses | (15,499) | (61,935)
Continuous unrealized loss position 12 months or more, fair value | 318,122 | 350,181
Continuous unrealized loss position 12 months or more, unrealized losses | (31,878) | (33,675)
Continuous unrealized loss position total, fair value | 419,547 | 1,104,236
Continuous unrealized loss position total, unrealized losses | (47,377) | (95,610)
Corporate debt securities | Non-investment grade |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |
Continuous unrealized loss position less than 12 months, fair value |  | 9,973
Continuous unrealized loss position less than 12 months, unrealized losses |  | (565)
Continuous unrealized loss position 12 months or more, fair value | 10,357 | 9,595
Continuous unrealized loss position 12 months or more, unrealized losses | (9,778) | (10,513)
Continuous unrealized loss position total, fair value | 10,357 | 19,568
Continuous unrealized loss position total, unrealized losses | (9,778) | (11,078)
Other securities |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |
Continuous unrealized loss position less than 12 months, fair value |  | 4,503
Continuous unrealized loss position less than 12 months, unrealized losses |  | (2)
Continuous unrealized loss position total, fair value |  | 4,503
Continuous unrealized loss position total, unrealized losses |  | $ (2)

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