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INVESTMENT SECURITIES (Details 2) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value |  |
Less Than 12 Months | $ 926,204 | $ 2,527,519
12 Months or More | 246,023 | 228,733
Total | 1,172,227 | 2,756,252
Gross Unrealized Losses |  |
Less Than 12 Months | (3,887) | (16,075)
12 Months or More | (5,634) | (6,272)
Total | (9,521) | (22,347)
U.S. Treasury securities |  |
Fair Value |  |
Less Than 12 Months | 60,855 | 907,400
12 Months or More | 30,570 | 20,282
Total | 91,425 | 927,682
Gross Unrealized Losses |  |
Less Than 12 Months | (42) | (4,250)
12 Months or More | (32) | (142)
Total | (74) | (4,392)
U.S. government agency and U.S. government sponsored enterprise debt securities |  |
Fair Value |  |
Less Than 12 Months | 229,834 | 541,385
12 Months or More | 9,189 | 0
Total | 239,023 | 541,385
Gross Unrealized Losses |  |
Less Than 12 Months | (571) | (2,994)
12 Months or More | (11) | 0
Total | (582) | (2,994)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 103,881 | 252,340
12 Months or More | 31,130 | 20,793
Total | 135,011 | 273,133
Gross Unrealized Losses |  |
Less Than 12 Months | (826) | (2,562)
12 Months or More | (390) | (462)
Total | (1,216) | (3,024)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 255,839 | 535,842
12 Months or More | 45,674 | 58,315
Total | 301,513 | 594,157
Gross Unrealized Losses |  |
Less Than 12 Months | (1,381) | (4,530)
12 Months or More | (930) | (1,871)
Total | (2,311) | (6,401)
Municipal securities |  |
Fair Value |  |
Less Than 12 Months | 5,917 | 48,495
12 Months or More | 15,794 | 14,739
Total | 21,711 | 63,234
Gross Unrealized Losses |  |
Less Than 12 Months | (31) | (437)
12 Months or More | (124) | (356)
Total | (155) | (793)
Non-agency residential mortgage-backed securities | Investment grade |  |
Fair Value |  |
Less Than 12 Months | 13,945 | 5,123
12 Months or More | 6,167 | 6,242
Total | 20,112 | 11,365
Gross Unrealized Losses |  |
Less Than 12 Months | (57) | (1)
12 Months or More | (19) | (172)
Total | (76) | (173)
Corporate debt securities | Investment grade |  |
Fair Value |  |
Less Than 12 Months | 248,730 | 218,944
12 Months or More | 90,899 | 89,989
Total | 339,629 | 308,933
Gross Unrealized Losses |  |
Less Than 12 Months | (976) | (1,189)
12 Months or More | (1,537) | (1,151)
Total | (2,513) | (2,340)
Corporate debt securities | Non-investment grade |  |
Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or More | 7,924 | 9,642
Total | 7,924 | 9,642
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or More | (2,267) | (1,849)
Total | (2,267) | (1,849)
Other securities |  |
Fair Value |  |
Less Than 12 Months | 7,203 | 17,990
12 Months or More | 8,676 | 8,731
Total | 15,879 | 26,721
Gross Unrealized Losses |  |
Less Than 12 Months | (3) | (112)
12 Months or More | (324) | (269)
Total | $ (327) | $ (381)

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