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INVESTMENT SECURITIES (Details 3) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |
Continuous unrealized loss position less than 12 months, fair value | $ 687,562 | $ 1,108,347
Continuous unrealized loss position less than 12 months, unrealized losses | (30,981) | (63,558)
Continuous unrealized loss position 12 months or more, fair value | 366,815 | 359,776
Continuous unrealized loss position 12 months or more, unrealized losses | (48,251) | (44,188)
Continuous unrealized loss position total, fair value | 1,054,377 | 1,468,123
Continuous unrealized loss position total, unrealized losses | (79,232) | (107,746)
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 | 141,223 | 143,265
Continuous unrealized loss position less than 12 months, unrealized losses | (525) | (279)
Continuous unrealized loss position total, fair value | 141,223 | 143,265
Continuous unrealized loss position total, unrealized losses | (525) | (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 | 93,968 | 195,393
Continuous unrealized loss position less than 12 months, unrealized losses | (369) | (772)
Continuous unrealized loss position total, fair value | 93,968 | 195,393
Continuous unrealized loss position total, unrealized losses | (369) | (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 |  | 1,158
Continuous unrealized loss position less than 12 months, unrealized losses |  | (5)
Continuous unrealized loss position total, fair value |  | 1,158
Continuous unrealized loss position total, unrealized losses |  | (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 | 450,019 | 754,055
Continuous unrealized loss position less than 12 months, unrealized losses | (30,057) | (61,935)
Continuous unrealized loss position 12 months or more, fair value | 357,426 | 350,181
Continuous unrealized loss position 12 months or more, unrealized losses | (37,574) | (33,675)
Continuous unrealized loss position total, fair value | 807,445 | 1,104,236
Continuous unrealized loss position total, unrealized losses | (67,631) | (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 | 2,352 | 9,973
Continuous unrealized loss position less than 12 months, unrealized losses | (30) | (565)
Continuous unrealized loss position 12 months or more, fair value | 9,389 | 9,595
Continuous unrealized loss position 12 months or more, unrealized losses | (10,677) | (10,513)
Continuous unrealized loss position total, fair value | 11,741 | 19,568
Continuous unrealized loss position total, unrealized losses | (10,707) | (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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