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INVESTMENT SECURITIES (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | $ 2,504,755 |  | $ 2,786,490 |
Gross Unrealized Gains | 15,232 |  | 12,203 |
Gross Unrealized Losses | (45,243) |  | (64,896) |
Fair Value | 2,474,744 |  | 2,733,797 |
U.S. Treasury securities |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 431,307 |  | 495,053 |
Gross Unrealized Gains | 91 |  | 201 |
Gross Unrealized Losses | (3,145) |  | (3,622) |
Fair Value | 428,253 |  | 491,632 |
U.S. Government agency and U.S. Government sponsored enterprise debt securities |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 391,470 |  | 406,807 |
Gross Unrealized Gains | 763 |  | 242 |
Gross Unrealized Losses | (7,548) |  | (12,726) |
Fair Value | 384,685 |  | 394,323 |
U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 120,999 |  | 182,257 |
Gross Unrealized Gains | 769 |  | 1,062 |
Gross Unrealized Losses | (2,661) |  | (4,449) |
Fair Value | 119,107 |  | 178,870 |
U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 829,005 |  | 892,435 |
Gross Unrealized Gains | 7,331 |  | 7,729 |
Gross Unrealized Losses | (12,231) |  | (14,927) |
Fair Value | 824,105 |  | 885,237 |
Municipal securities |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 290,241 |  | 297,390 |
Gross Unrealized Gains | 3,197 |  | 1,122 |
Gross Unrealized Losses | (9,541) |  | (17,533) |
Fair Value | 283,897 |  | 280,979 |
Other residential mortgage-backed securities: | Investment grade |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 58,450 |  | 48,129 |
Gross Unrealized Losses | (1,443) |  | (1,802) |
Fair Value | 57,007 |  | 46,327 |
Other commercial mortgage-backed securities: | Investment grade |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 50,999 |  | 51,000 |
Gross Unrealized Gains | 420 |  | 617 |
Fair Value | 51,419 |  | 51,617 |
Corporate debt securities | Investment grade |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 212,593 |  | 312,726 |
Gross Unrealized Gains | 60 |  | 613 |
Gross Unrealized Losses | (2,962) |  | (3,344) |
Fair Value | 209,691 |  | 309,995 |
Corporate debt securities | Non-investment grade |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 20,577 | [1] | 20,668 | [1]
Gross Unrealized Gains | 28 |  | 62 |
Gross Unrealized Losses | (5,093) | [1] | (5,629) | [1]
Fair Value | 15,512 | [1] | 15,101 | [1]
Other securities |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 99,114 |  | 80,025 |
Gross Unrealized Gains | 2,573 |  | 555 |
Gross Unrealized Losses | (619) |  | (864) |
Fair Value | $ 101,068 |  | $ 79,716 |
[1] | For the three months ended March 31, 2014 and the year ended December 31, 2013, the Company did not record any OTTI.

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