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AVAILABLE-FOR-SALE INVESTMENT SECURITIES (Details 4) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
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Gross unrealized losses and related fair values of individual securities in a continuous unrealized loss position |  |
Continuous unrealized loss position less than 12 months, Fair Value | $ 626,362 | $ 414,390
Continuous unrealized loss position less than 12 months, Gross Unrealized Losses | (4,766) | (2,051)
Continuous unrealized loss position 12 months or more, Fair Value | 325,703 | 718,223
Continuous unrealized loss position 12 months or more, Gross Unrealized Losses | (6,184) | (11,917)
Continuous unrealized loss position total, Fair Value | 952,065 | 1,132,613
Continuous unrealized loss position total, Gross Unrealized Losses | (10,950) | (13,968)
U.S. Treasury securities |  |
Gross unrealized losses and related fair values of individual securities in a continuous unrealized loss position |  |
Continuous unrealized loss position less than 12 months, Fair Value | 61,141 | 170,260
Continuous unrealized loss position less than 12 months, Gross Unrealized Losses | (30) | (266)
Continuous unrealized loss position 12 months or more, Fair Value | 50,766 | 163,800
Continuous unrealized loss position 12 months or more, Gross Unrealized Losses | (142) | (1,371)
Continuous unrealized loss position total, Fair Value | 111,907 | 334,060
Continuous unrealized loss position total, Gross Unrealized Losses | (172) | (1,637)
U.S. government agency and U.S. government sponsored enterprise debt securities |  |
Gross unrealized losses and related fair values of individual securities in a continuous unrealized loss position |  |
Continuous unrealized loss position less than 12 months, Fair Value | 256,518 | 69,438
Continuous unrealized loss position less than 12 months, Gross Unrealized Losses | (1,106) | (504)
Continuous unrealized loss position 12 months or more, Fair Value | 24,887 | 124,104
Continuous unrealized loss position 12 months or more, Gross Unrealized Losses | (110) | (889)
Continuous unrealized loss position total, Fair Value | 281,405 | 193,542
Continuous unrealized loss position total, Gross Unrealized Losses | (1,216) | (1,393)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
Gross unrealized losses and related fair values of individual securities in a continuous unrealized loss position |  |
Continuous unrealized loss position less than 12 months, Fair Value | 86,572 | 45,405
Continuous unrealized loss position less than 12 months, Gross Unrealized Losses | (504) | (257)
Continuous unrealized loss position 12 months or more, Fair Value | 21,982 | 16,169
Continuous unrealized loss position 12 months or more, Gross Unrealized Losses | (441) | (336)
Continuous unrealized loss position total, Fair Value | 108,554 | 61,574
Continuous unrealized loss position total, Gross Unrealized Losses | (945) | (593)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
Gross unrealized losses and related fair values of individual securities in a continuous unrealized loss position |  |
Continuous unrealized loss position less than 12 months, Fair Value | 135,426 | 81,927
Continuous unrealized loss position less than 12 months, Gross Unrealized Losses | (1,115) | (270)
Continuous unrealized loss position 12 months or more, Fair Value | 96,853 | 241,047
Continuous unrealized loss position 12 months or more, Gross Unrealized Losses | (1,956) | (3,808)
Continuous unrealized loss position total, Fair Value | 232,279 | 322,974
Continuous unrealized loss position total, Gross Unrealized Losses | $ (3,071) | $ (4,078)
Percentage of the total available-for-sale investment securities portfolio | 23.00% | 30.00%
Municipal securities |  |
Gross unrealized losses and related fair values of individual securities in a continuous unrealized loss position |  |
Continuous unrealized loss position less than 12 months, Fair Value | $ 52,924 | $ 6,391
Continuous unrealized loss position less than 12 months, Gross Unrealized Losses | (1,906) | (26)
Continuous unrealized loss position 12 months or more, Fair Value | 15,262 | 61,107
Continuous unrealized loss position 12 months or more, Gross Unrealized Losses | (955) | (1,136)
Continuous unrealized loss position total, Fair Value | 68,186 | 67,498
Continuous unrealized loss position total, Gross Unrealized Losses | $ (2,861) | $ (1,162)
Percentage of the total available-for-sale investment securities portfolio | 7.00% | 10.00%
Other residential mortgage-backed securities | Investment grade |  |
Gross unrealized losses and related fair values of individual securities in a continuous unrealized loss position |  |
Continuous unrealized loss position less than 12 months, Fair Value | $ 5,684 |
Continuous unrealized loss position less than 12 months, Gross Unrealized Losses | (16) |
Continuous unrealized loss position 12 months or more, Fair Value | 6,589 | $ 7,217
Continuous unrealized loss position 12 months or more, Gross Unrealized Losses | (279) | (135)
Continuous unrealized loss position total, Fair Value | 12,273 | 7,217
Continuous unrealized loss position total, Gross Unrealized Losses | (295) | (135)
Corporate debt securities | Investment grade |  |
Gross unrealized losses and related fair values of individual securities in a continuous unrealized loss position |  |
Continuous unrealized loss position less than 12 months, Fair Value | 10,050 | 25,084
Continuous unrealized loss position less than 12 months, Gross Unrealized Losses | (36) | (12)
Continuous unrealized loss position 12 months or more, Fair Value | 90,618 | 90,098
Continuous unrealized loss position 12 months or more, Gross Unrealized Losses | (522) | (1,042)
Continuous unrealized loss position total, Fair Value | 100,668 | 115,182
Continuous unrealized loss position total, Gross Unrealized Losses | (558) | (1,054)
Corporate debt securities | Non-investment grade |  |
Gross unrealized losses and related fair values of individual securities in a continuous unrealized loss position |  |
Continuous unrealized loss position 12 months or more, Fair Value | 10,025 | 14,681
Continuous unrealized loss position 12 months or more, Gross Unrealized Losses | (1,500) | (3,200)
Continuous unrealized loss position total, Fair Value | 10,025 | 14,681
Continuous unrealized loss position total, Gross Unrealized Losses | $ (1,500) | $ (3,200)
Percentage of the total available-for-sale investment securities portfolio | 1.00% | 1.00%
Other securities |  |
Gross unrealized losses and related fair values of individual securities in a continuous unrealized loss position |  |
Continuous unrealized loss position less than 12 months, Fair Value | $ 18,047 | $ 15,885
Continuous unrealized loss position less than 12 months, Gross Unrealized Losses | (53) | (716)
Continuous unrealized loss position 12 months or more, Fair Value | 8,721 |
Continuous unrealized loss position 12 months or more, Gross Unrealized Losses | (279) |
Continuous unrealized loss position total, Fair Value | 26,768 | 15,885
Continuous unrealized loss position total, Gross Unrealized Losses | $ (332) | $ (716)

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