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INVESTMENT SECURITIES (Details 4) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |
Continuous unrealized loss position less than 12 months, fair value | $ 1,412,651 | $ 1,803,074
Continuous unrealized loss position less than 12 months, unrealized losses | (27,692) | (45,167)
Continuous unrealized loss position 12 months or more, fair value | 294,599 | 250,361
Continuous unrealized loss position 12 months or more, unrealized losses | (17,551) | (19,729)
Continuous unrealized loss position total, fair value | 1,707,250 | 2,053,435
Continuous unrealized loss position total, unrealized losses | (45,243) | (64,896)
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 | 346,069 | 337,248
Continuous unrealized loss position less than 12 months, unrealized losses | (3,145) | (3,622)
Continuous unrealized loss position total, fair value | 346,069 | 337,248
Continuous unrealized loss position total, unrealized losses | (3,145) | (3,622)
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 | 252,148 | 387,097
Continuous unrealized loss position less than 12 months, unrealized losses | (7,548) | (12,726)
Continuous unrealized loss position total, fair value | 252,148 | 387,097
Continuous unrealized loss position total, unrealized losses | (7,548) | (12,726)
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 | 81,367 | 114,754
Continuous unrealized loss position less than 12 months, unrealized losses | (1,752) | (3,280)
Continuous unrealized loss position 12 months or more, fair value | 16,082 | 16,065
Continuous unrealized loss position 12 months or more, unrealized losses | (909) | (1,169)
Continuous unrealized loss position total, fair value | 97,449 | 130,819
Continuous unrealized loss position total, unrealized losses | (2,661) | (4,449)
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 | 417,992 | 502,285
Continuous unrealized loss position less than 12 months, unrealized losses | (7,447) | (10,570)
Continuous unrealized loss position 12 months or more, fair value | 119,255 | 92,540
Continuous unrealized loss position 12 months or more, unrealized losses | (4,784) | (4,357)
Continuous unrealized loss position total, fair value | 537,247 | 594,825
Continuous unrealized loss position total, unrealized losses | (12,231) | (14,927)
Municipal securities |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |
Continuous unrealized loss position less than 12 months, fair value | 110,001 | 173,782
Continuous unrealized loss position less than 12 months, unrealized losses | (4,462) | (10,765)
Continuous unrealized loss position 12 months or more, fair value | 64,839 | 47,892
Continuous unrealized loss position 12 months or more, unrealized losses | (5,079) | (6,768)
Continuous unrealized loss position total, fair value | 174,840 | 221,674
Continuous unrealized loss position total, unrealized losses | (9,541) | (17,533)
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 | 57,007 | 46,328
Continuous unrealized loss position less than 12 months, unrealized losses | (1,443) | (1,802)
Continuous unrealized loss position total, fair value | 57,007 | 46,328
Continuous unrealized loss position total, unrealized losses | (1,443) | (1,802)
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 | 128,623 | 193,482
Continuous unrealized loss position less than 12 months, unrealized losses | (1,276) | (1,538)
Continuous unrealized loss position 12 months or more, fair value | 79,554 | 79,442
Continuous unrealized loss position 12 months or more, unrealized losses | (1,686) | (1,806)
Continuous unrealized loss position total, fair value | 208,177 | 272,924
Continuous unrealized loss position total, unrealized losses | (2,962) | (3,344)
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 | 14,869 | 14,422
Continuous unrealized loss position 12 months or more, unrealized losses | (5,093) | (5,629)
Continuous unrealized loss position total, fair value | 14,869 | 14,422
Continuous unrealized loss position total, unrealized losses | (5,093) | (5,629)
Other securities |  |
Continuous unrealized loss position, fair values of investment securities available-for-sale |  |
Continuous unrealized loss position less than 12 months, fair value | 19,444 | 48,098
Continuous unrealized loss position less than 12 months, unrealized losses | (619) | (864)
Continuous unrealized loss position total, fair value | 19,444 | 48,098
Continuous unrealized loss position total, unrealized losses | $ (619) | $ (864)

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