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AVAILABLE-FOR-SALE INVESTMENT SECURITIES (Details 4) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Value |  |
Less Than 12 Months | $ 434,038 | $ 414,390
12 Months or More | 241,519 | 718,223
Total | 675,557 | 1,132,613
Gross Unrealized Losses |  |
Less Than 12 Months | (3,349) | (2,051)
12 Months or More | (4,743) | (11,917)
Total | (8,092) | (13,968)
U.S. Treasury securities |  |
Fair Value |  |
Less Than 12 Months | 10,332 | 170,260
12 Months or More | 20,479 | 163,800
Total | 30,811 | 334,060
Gross Unrealized Losses |  |
Less Than 12 Months | (1) | (266)
12 Months or More | (7) | (1,371)
Total | (8) | (1,637)
U.S. government agency and U.S. government sponsored enterprise debt securities |  |
Fair Value |  |
Less Than 12 Months | 180,594 | 69,438
12 Months or More | 0 | 124,104
Total | 180,594 | 193,542
Gross Unrealized Losses |  |
Less Than 12 Months | (1,619) | (504)
12 Months or More | 0 | (889)
Total | (1,619) | (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 | 13,279 | 45,405
12 Months or More | 21,500 | 16,169
Total | 34,779 | 61,574
Gross Unrealized Losses |  |
Less Than 12 Months | (63) | (257)
12 Months or More | (342) | (336)
Total | (405) | (593)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 122,716 | 81,927
12 Months or More | 69,189 | 241,047
Total | 191,905 | 322,974
Gross Unrealized Losses |  |
Less Than 12 Months | (520) | (270)
12 Months or More | (1,295) | (3,808)
Total | $ (1,815) | $ (4,078)
Percentage of the total available-for-sale investment securities portfolio | 26.00% | 30.00%
Municipal securities |  |
Fair Value |  |
Less Than 12 Months | $ 47,613 | $ 6,391
12 Months or More | 14,536 | 61,107
Total | 62,149 | 67,498
Gross Unrealized Losses |  |
Less Than 12 Months | (1,028) | (26)
12 Months or More | (583) | (1,136)
Total | $ (1,611) | $ (1,162)
Percentage of the total available-for-sale investment securities portfolio | 24.00% | 12.00%
Other residential mortgage-backed securities | Investment grade |  |
Fair Value |  |
Less Than 12 Months | $ 7,289 | $ 0
12 Months or More | 6,576 | 7,217
Total | 13,865 | 7,217
Gross Unrealized Losses |  |
Less Than 12 Months | (25) | 0
12 Months or More | (91) | (135)
Total | (116) | (135)
Corporate debt securities | Investment grade |  |
Fair Value |  |
Less Than 12 Months | 45,013 | 25,084
12 Months or More | 90,114 | 90,098
Total | 135,127 | 115,182
Gross Unrealized Losses |  |
Less Than 12 Months | (87) | (12)
12 Months or More | (1,025) | (1,042)
Total | (1,112) | (1,054)
Corporate debt securities | Non-investment grade |  |
Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or More | 10,524 | 14,681
Total | 10,524 | 14,681
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or More | (1,001) | (3,200)
Total | $ (1,001) | $ (3,200)
Percentage of the total available-for-sale investment securities portfolio | 5.00% | 5.00%
Other securities |  |
Fair Value |  |
Less Than 12 Months | $ 7,202 | $ 15,885
12 Months or More | 8,601 | 0
Total | 15,803 | 15,885
Gross Unrealized Losses |  |
Less Than 12 Months | (6) | (716)
12 Months or More | (399) | 0
Total | $ (405) | $ (716)

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