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INVESTMENT SECURITIES (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2013
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost |  | $ 2,599,018 |  | $ 2,704,652 |
Gross Unrealized Gains |  | 34,739 |  | 14,804 |
Gross Unrealized Losses |  | (26,728) |  | (52,284) |
Fair Value |  | 2,607,029 |  | 2,667,172 |
Other than temporary impairment, pre-tax basis, credit portion recognized in earnings | 99 | 99 |  |  |
Other than temporary impairment, pre-tax basis, non-credit portion recognized in other comprehensive income |  | 5,100 |  |  |
U.S. Treasury securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost |  | 459,613 |  | 519,653 |
Gross Unrealized Gains |  | 1,135 |  | 72 |
Gross Unrealized Losses |  | (71) |  | (3,963) |
Fair Value |  | 460,677 |  | 515,762 |
U.S. Government agency and U.S. Government sponsored enterprise debt securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost |  | 197,264 |  | 256,996 |
Gross Unrealized Gains |  | 673 |  | 249 |
Gross Unrealized Losses |  | (82) |  | (6,990) |
Fair Value |  | 197,855 |  | 250,255 |
U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost |  | 174,036 |  | 136,700 |
Gross Unrealized Gains |  | 6,665 |  | 693 |
Gross Unrealized Losses |  | (36) |  | (3,145) |
Fair Value |  | 180,665 |  | 134,248 |
U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost |  | 1,123,880 |  | 997,211 |
Gross Unrealized Gains |  | 20,883 |  | 10,586 |
Gross Unrealized Losses |  | (678) |  | (11,280) |
Fair Value |  | 1,144,085 |  | 996,517 |
Municipal securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost |  | 163,333 |  | 242,615 |
Gross Unrealized Gains |  | 4,491 |  | 1,082 |
Gross Unrealized Losses |  | (731) |  | (14,424) |
Fair Value |  | 167,093 |  | 229,273 |
Other residential mortgage-backed securities: | Investment grade |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost |  |  |  | 15,980 |
Gross Unrealized Losses |  |  |  | (778) |
Fair Value |  |  |  | 15,202 |
Other commercial mortgage-backed securities: | Investment grade |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost |  | 16,999 |  | 50,999 |
Gross Unrealized Gains |  | 85 |  | 298 |
Fair Value |  | 17,084 |  | 51,297 |
Corporate debt securities | Investment grade |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost |  | 429,318 |  | 451,688 |
Gross Unrealized Gains |  | 237 |  | 1,752 |
Gross Unrealized Losses |  | (17,572) |  | (5,229) |
Fair Value |  | 411,983 |  | 448,211 |
Corporate debt securities | Non-investment grade |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost |  | 24,620 | [1] | 22,020 | [1]
Gross Unrealized Gains |  | 355 | [1] | 63 | [1]
Gross Unrealized Losses |  | (7,558) | [1] | (6,443) | [1]
Fair Value |  | 17,417 | [1] | 15,640 | [1]
Other securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Investment securities available-for-sale, amortized cost |  | 9,955 |  | 10,790 |
Gross Unrealized Gains |  | 215 |  | 9 |
Gross Unrealized Losses |  |  |  | (32) |
Fair Value |  | $ 10,170 |  | $ 10,767 |
[1] | For the six months ended June 30, 2013, the Company did not record any OTTI. The Company recorded $99 thousand, on a pre-tax basis, of the credit portion of OTTI through earnings and $5.1 million of the non-credit portion of OTTI for pooled trust preferred securities in other comprehensive income for the year ended December 31, 2012.

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