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INVESTMENT SECURITIES (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | $ 2,534,163 |  | $ 2,786,490 |
Gross Unrealized Gains | 22,141 |  | 12,203 |
Gross Unrealized Losses | (26,652) |  | (64,896) |
Fair Value | 2,529,652 |  | 2,733,797 |
U.S. Treasury securities |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 450,149 |  | 495,053 |
Gross Unrealized Gains | 791 |  | 201 |
Gross Unrealized Losses | (1,628) |  | (3,622) |
Fair Value | 449,312 |  | 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 | 441,747 |  | 406,807 |
Gross Unrealized Gains | 938 |  | 242 |
Gross Unrealized Losses | (4,086) |  | (12,726) |
Fair Value | 438,599 |  | 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 | 112,607 |  | 182,257 |
Gross Unrealized Gains | 513 |  | 1,062 |
Gross Unrealized Losses | (1,363) |  | (4,449) |
Fair Value | 111,757 |  | 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 | 798,915 |  | 892,435 |
Gross Unrealized Gains | 8,108 |  | 7,729 |
Gross Unrealized Losses | (9,057) |  | (14,927) |
Fair Value | 797,966 |  | 885,237 |
Municipal securities |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 289,200 |  | 297,390 |
Gross Unrealized Gains | 4,926 |  | 1,122 |
Gross Unrealized Losses | (4,647) |  | (17,533) |
Fair Value | 289,479 |  | 280,979 |
Other residential mortgage-backed securities: | Investment grade |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 57,065 |  | 48,129 |
Gross Unrealized Gains | 557 |  |  |
Gross Unrealized Losses | (416) |  | (1,802) |
Fair Value | 57,206 |  | 46,327 |
Other commercial mortgage-backed securities: | Investment grade |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 51,000 |  | 51,000 |
Gross Unrealized Gains | 463 |  | 617 |
Fair Value | 51,463 |  | 51,617 |
Corporate debt securities | Investment grade |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 211,144 |  | 312,726 |
Gross Unrealized Gains | 1,172 |  | 613 |
Gross Unrealized Losses | (1,446) |  | (3,344) |
Fair Value | 210,870 |  | 309,995 |
Corporate debt securities | Non-investment grade |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 19,953 | [1] | 20,668 | [1]
Gross Unrealized Gains | 131 | [1] | 62 | [1]
Gross Unrealized Losses | (3,505) | [1] | (5,629) | [1]
Fair Value | 16,579 | [1] | 15,101 | [1]
Other securities |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Investment securities available-for-sale, amortized cost | 102,383 |  | 80,025 |
Gross Unrealized Gains | 4,542 |  | 555 |
Gross Unrealized Losses | (504) |  | (864) |
Fair Value | $ 106,421 |  | $ 79,716 |
[1] | For the six months ended June 30, 2014 and the year ended December 31, 2013, the Company did not record any OTTI.

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