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INVESTMENT SECURITIES (Details 2) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value |  |
Less Than 12 Months | $ 596,906 | $ 2,527,519
12 Months or More | 162,182 | 228,733
Total | 759,088 | 2,756,252
Gross Unrealized Losses |  |
Less Than 12 Months | (2,377) | (16,075)
12 Months or More | (3,984) | (6,272)
Total | (6,361) | (22,347)
Fair Value |  |
Less Than 12 Months | 755,185 |
12 Months or More | 162,182 |
Total | 917,367 |
Gross Unrealized Losses |  |
Less Than 12 Months | (3,306) |
12 Months or More | (3,984) |
Total | (7,290) |
U.S. Treasury securities |  |
Fair Value |  |
Less Than 12 Months | 0 | 907,400
12 Months or More | 0 | 20,282
Total | 0 | 927,682
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (4,250)
12 Months or More | 0 | (142)
Total | 0 | (4,392)
US Government-sponsored Enterprises Debt Securities [Member] |  |
Fair Value |  |
Less Than 12 Months | 85,210 | 541,385
12 Months or More | 0 | 0
Total | 85,210 | 541,385
Gross Unrealized Losses |  |
Less Than 12 Months | (191) | (2,994)
12 Months or More | 0 | 0
Total | (191) | (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 | 50,477 | 252,340
12 Months or More | 24,377 | 20,793
Total | 74,854 | 273,133
Gross Unrealized Losses |  |
Less Than 12 Months | (476) | (2,562)
12 Months or More | (327) | (462)
Total | (803) | (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 | 295,399 | 535,842
12 Months or More | 26,327 | 58,315
Total | 321,726 | 594,157
Gross Unrealized Losses |  |
Less Than 12 Months | (1,097) | (4,530)
12 Months or More | (626) | (1,871)
Total | (1,723) | (6,401)
Municipal securities |  |
Fair Value |  |
Less Than 12 Months | 4,398 | 48,495
12 Months or More | 2,896 | 14,739
Total | 7,294 | 63,234
Gross Unrealized Losses |  |
Less Than 12 Months | (50) | (437)
12 Months or More | (4) | (356)
Total | (54) | (793)
Non-agency residential mortgage-backed securities | Investment grade |  |
Fair Value |  |
Less Than 12 Months | 7,470 | 5,123
12 Months or More | 0 | 6,242
Total | 7,470 | 11,365
Gross Unrealized Losses |  |
Less Than 12 Months | (29) | (1)
12 Months or More | 0 | (172)
Total | (29) | (173)
Corporate debt securities | Investment grade |  |
Fair Value |  |
Less Than 12 Months | 149,452 | 218,944
12 Months or More | 91,236 | 89,989
Total | 240,688 | 308,933
Gross Unrealized Losses |  |
Less Than 12 Months | (533) | (1,189)
12 Months or More | (1,182) | (1,151)
Total | (1,715) | (2,340)
Corporate debt securities | Non-investment grade |  |
Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or More | 8,408 | 9,642
Total | 8,408 | 9,642
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or More | (1,783) | (1,849)
Total | (1,783) | (1,849)
Other securities |  |
Fair Value |  |
Less Than 12 Months | 4,500 | 17,990
12 Months or More | 8,938 | 8,731
Total | 13,438 | 26,721
Gross Unrealized Losses |  |
Less Than 12 Months | (1) | (112)
12 Months or More | (62) | (269)
Total | (63) | $ (381)
Non-agency commercial mortgage-backed security |  |
Fair Value |  |
Less Than 12 Months | 158,279 |
12 Months or More | 0 |
Total | 158,279 |
Gross Unrealized Losses |  |
Less Than 12 Months | (929) |
12 Months or More | 0 |
Total | $ (929) |

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