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INVESTMENT SECURITIES (Details 4) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |
Continuous unrealized loss position less than 12 months, fair value | $ 1,577,597 | $ 620,165
Continuous unrealized loss position less than 12 months, unrealized losses | (40,605) | (6,989)
Continuous unrealized loss position 12 months or more, fair value | 152,581 | 195,271
Continuous unrealized loss position 12 months or more, unrealized losses | (11,679) | (19,739)
Continuous unrealized loss position total, fair value | 1,730,178 | 815,436
Continuous unrealized loss position total, unrealized losses | (52,284) | (26,728)
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 | 403,759 | 95,232
Continuous unrealized loss position less than 12 months, unrealized losses | (3,963) | (71)
Continuous unrealized loss position total, fair value | 403,759 | 95,232
Continuous unrealized loss position total, unrealized losses | (3,963) | (71)
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 | 243,025 | 24,912
Continuous unrealized loss position less than 12 months, unrealized losses | (6,990) | (82)
Continuous unrealized loss position total, fair value | 243,025 | 24,912
Continuous unrealized loss position total, unrealized losses | (6,990) | (82)
U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Commercial 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 | 112,519 | 10,013
Continuous unrealized loss position less than 12 months, unrealized losses | (3,145) | (36)
Continuous unrealized loss position total, fair value | 112,519 | 10,013
Continuous unrealized loss position total, unrealized losses | (3,145) | (36)
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 | 508,853 | 215,826
Continuous unrealized loss position less than 12 months, unrealized losses | (10,991) | (678)
Continuous unrealized loss position 12 months or more, fair value | 13,909 |
Continuous unrealized loss position 12 months or more, unrealized losses | (289) |
Continuous unrealized loss position total, fair value | 522,762 | 215,826
Continuous unrealized loss position total, unrealized losses | (11,280) | (678)
Municipal securities |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |
Continuous unrealized loss position less than 12 months, fair value | 181,003 | 48,363
Continuous unrealized loss position less than 12 months, unrealized losses | (14,424) | (731)
Continuous unrealized loss position total, fair value | 181,003 | 48,363
Continuous unrealized loss position total, unrealized losses | (14,424) | (731)
Other residential mortgage-backed 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 | 15,203 |
Continuous unrealized loss position less than 12 months, unrealized losses | (778) |
Continuous unrealized loss position total, fair value | 15,203 |
Continuous unrealized loss position total, unrealized losses | (778) |
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 | 105,966 | 225,819
Continuous unrealized loss position less than 12 months, unrealized losses | (282) | (5,391)
Continuous unrealized loss position 12 months or more, fair value | 125,053 | 182,697
Continuous unrealized loss position 12 months or more, unrealized losses | (4,947) | (12,181)
Continuous unrealized loss position total, fair value | 231,019 | 408,516
Continuous unrealized loss position total, unrealized losses | (5,229) | (17,572)
Corporate debt securities | Non-investment grade |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |
Continuous unrealized loss position 12 months or more, fair value | 13,619 | 12,574
Continuous unrealized loss position 12 months or more, unrealized losses | (6,443) | (7,558)
Continuous unrealized loss position total, fair value | 13,619 | 12,574
Continuous unrealized loss position total, unrealized losses | (6,443) | (7,558)
Other securities |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |
Continuous unrealized loss position less than 12 months, fair value | 7,269 |
Continuous unrealized loss position less than 12 months, unrealized losses | (32) |
Continuous unrealized loss position total, fair value | 7,269 |
Continuous unrealized loss position total, unrealized losses | $ (32) |

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