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AVAILABLE-FOR-SALE INVESTMENT SECURITIES (Details 2) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Value |  |
Less Than 12 Months | $ 2,527,519 | $ 414,390
12 Months or More | 228,733 | 718,223
Total | 2,756,252 | 1,132,613
Gross Unrealized Losses |  |
Less Than 12 Months | (16,075) | (2,051)
12 Months or More | (6,272) | (11,917)
Total | (22,347) | (13,968)
U.S. Treasury securities |  |
Fair Value |  |
Less Than 12 Months | 907,400 | 170,260
12 Months or More | 20,282 | 163,800
Total | 927,682 | 334,060
Gross Unrealized Losses |  |
Less Than 12 Months | (4,250) | (266)
12 Months or More | (142) | (1,371)
Total | (4,392) | (1,637)
U.S. government agency and U.S. government sponsored enterprise debt securities |  |
Fair Value |  |
Less Than 12 Months | 541,385 | 69,438
12 Months or More | 0 | 124,104
Total | 541,385 | 193,542
Gross Unrealized Losses |  |
Less Than 12 Months | (2,994) | (504)
12 Months or More | 0 | (889)
Total | (2,994) | (1,393)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 252,340 | 45,405
12 Months or More | 20,793 | 16,169
Total | 273,133 | 61,574
Gross Unrealized Losses |  |
Less Than 12 Months | (2,562) | (257)
12 Months or More | (462) | (336)
Total | (3,024) | (593)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 535,842 | 81,927
12 Months or More | 58,315 | 241,047
Total | 594,157 | 322,974
Gross Unrealized Losses |  |
Less Than 12 Months | (4,530) | (270)
12 Months or More | (1,871) | (3,808)
Total | (6,401) | (4,078)
Municipal securities |  |
Fair Value |  |
Less Than 12 Months | 48,495 | 6,391
12 Months or More | 14,739 | 61,107
Total | 63,234 | 67,498
Gross Unrealized Losses |  |
Less Than 12 Months | (437) | (26)
12 Months or More | (356) | (1,136)
Total | (793) | (1,162)
Other residential mortgage-backed securities: | Investment grade |  |
Fair Value |  |
Less Than 12 Months | 5,123 | 0
12 Months or More | 6,242 | 7,217
Total | 11,365 | 7,217
Gross Unrealized Losses |  |
Less Than 12 Months | (1) | 0
12 Months or More | (172) | (135)
Total | (173) | (135)
Corporate debt securities: | Investment grade |  |
Fair Value |  |
Less Than 12 Months | 218,944 | 25,084
12 Months or More | 89,989 | 90,098
Total | 308,933 | 115,182
Gross Unrealized Losses |  |
Less Than 12 Months | (1,189) | (12)
12 Months or More | (1,151) | (1,042)
Total | (2,340) | (1,054)
Corporate debt securities: | Non-investment grade |  |
Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or More | 9,642 | 14,681
Total | 9,642 | 14,681
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or More | (1,849) | (3,200)
Total | (1,849) | (3,200)
Other securities |  |
Fair Value |  |
Less Than 12 Months | 17,990 | 15,885
12 Months or More | 8,731 | 0
Total | 26,721 | 15,885
Gross Unrealized Losses |  |
Less Than 12 Months | (112) | (716)
12 Months or More | (269) | 0
Total | $ (381) | $ (716)

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