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INVESTMENT SECURITIES (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities |  |
Amortized Cost | $ 3,220,048 | $ 3,783,829
Gross Unrealized Gains | 26,645 | 11,744
Gross Unrealized Losses | (6,361) | (22,347)
Available-for-sale investment securities, at fair value | 3,240,332 | 3,773,226
Schedule of Held-to-maturity Security |  |
Amortized Cost | 159,208 | 0
Fair Value | 158,279 |
Investment Securities |  |
Amortized Cost | 3,379,256 |
Gross Unrealized Gains | 26,645 |
Gross Unrealized Losses | (7,290) |
Fair Value | 3,398,611 |
U.S. Treasury securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 485,137 | 1,002,874
Gross Unrealized Gains | 3,423 | 33
Gross Unrealized Losses | 0 | (4,392)
Available-for-sale investment securities, at fair value | 488,560 | 998,515
U.S. government agency and U.S. government sponsored enterprise debt securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 701,085 | 771,288
Gross Unrealized Gains | 3,035 | 555
Gross Unrealized Losses | (191) | (2,994)
Available-for-sale investment securities, at fair value | 703,929 | 768,849
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 305,724 | 354,418
Gross Unrealized Gains | 3,443 | 268
Gross Unrealized Losses | (803) | (3,024)
Available-for-sale investment securities, at fair value | 308,364 | 351,662
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 1,050,583 | 996,255
Gross Unrealized Gains | 10,041 | 7,542
Gross Unrealized Losses | (1,723) | (6,401)
Available-for-sale investment securities, at fair value | 1,058,901 | 997,396
Municipal securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 149,711 | 173,785
Gross Unrealized Gains | 4,246 | 2,657
Gross Unrealized Losses | (54) | (793)
Available-for-sale investment securities, at fair value | 153,903 | 175,649
Non-agency residential mortgage-backed securities | Investment grade |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 54,728 | 62,133
Gross Unrealized Gains | 1,276 | 433
Gross Unrealized Losses | (29) | (173)
Available-for-sale investment securities, at fair value | 55,975 | 62,393
Corporate debt securities | Investment grade |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 418,104 | 366,921
Gross Unrealized Gains | 475 | 132
Gross Unrealized Losses | (1,715) | (2,340)
Available-for-sale investment securities, at fair value | 416,864 | 364,713
Corporate debt securities | Non-investment grade |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 10,191 | 11,491
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,783) | (1,849)
Available-for-sale investment securities, at fair value | 8,408 | 9,642
Other securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 44,785 | 44,664
Gross Unrealized Gains | 706 | 124
Gross Unrealized Losses | (63) | (381)
Available-for-sale investment securities, at fair value | 45,428 | $ 44,407
Non-agency commercial mortgage-backed security |  |
Schedule of Held-to-maturity Security |  |
Amortized Cost | 159,208 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (929) |
Fair Value | $ 158,279 |

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