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FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | $ 2,982,146 | $ 2,626,365
Derivative |  |  |
Derivative assets |  | 10,752 | 12,383
Derivative liabilities |  | (54,746) | (56,493)
U.S. Treasury securities |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 1,200,111 | 873,435
U.S. government agency and U.S. government sponsored enterprise debt securities |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 424,863 | 311,024
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 187,388 | 141,420
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 688,712 | 791,088
Municipal securities |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 206,422 | 250,448
Other residential mortgage-backed securities | Investment grade |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities | [1] | 61,908 | 53,918
Other commercial mortgage-backed securities | Investment grade |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities | [1] |  | 34,053
Corporate debt securities | Investment grade |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities | [1] | 156,978 | 115,182
Corporate debt securities | Non-investment grade |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities | [1] | 10,025 | 14,681
Other securities |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 45,739 | 41,116
Fair Value, Measurements, Recurring |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 2,982,146 | 2,626,365
Fair Value, Measurements, Recurring | Foreign exchange options |  |  |
Derivative |  |  |
Derivative assets |  |  | 6,136
Fair Value, Measurements, Recurring | Interest rate swaps on certificates of deposit |  |  |
Derivative |  |  |
Derivative liabilities |  | (8,177) | (9,922)
Fair Value, Measurements, Recurring | Interest rate swaps and caps |  |  |
Derivative |  |  |
Derivative assets |  | 44,424 | 41,534
Derivative liabilities |  | (43,810) | (41,779)
Fair Value, Measurements, Recurring | Foreign exchange contracts |  |  |
Derivative |  |  |
Derivative assets |  | 11,044 | 8,118
Derivative liabilities |  | (10,186) | (9,163)
Fair Value, Measurements, Recurring | Embedded derivative liabilities |  |  |
Derivative |  |  |
Derivative liabilities |  |  | (3,392)
Fair Value, Measurements, Recurring | U.S. Treasury securities |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 1,200,111 | 873,435
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government sponsored enterprise debt securities |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 424,863 | 311,024
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 187,388 | 141,420
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 688,712 | 791,088
Fair Value, Measurements, Recurring | Municipal securities |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 206,422 | 250,448
Fair Value, Measurements, Recurring | Other residential mortgage-backed securities | Investment grade |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 61,908 | 53,918
Fair Value, Measurements, Recurring | Other commercial mortgage-backed securities | Investment grade |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  |  | 34,053
Fair Value, Measurements, Recurring | Corporate debt securities | Investment grade |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 156,978 | 115,182
Fair Value, Measurements, Recurring | Corporate debt securities | Non-investment grade |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 10,025 | 14,681
Fair Value, Measurements, Recurring | Other securities |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 45,739 | 41,116
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 1,235,645 | 905,540
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury securities |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 1,200,111 | 873,435
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other securities |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 35,534 | 32,105
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 1,746,501 | 1,714,297
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange options |  |  |
Derivative |  |  |
Derivative assets |  |  | 6,136
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps on certificates of deposit |  |  |
Derivative |  |  |
Derivative liabilities |  | (8,177) | (9,922)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps and caps |  |  |
Derivative |  |  |
Derivative assets |  | 44,424 | 41,534
Derivative liabilities |  | (43,810) | (41,779)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts |  |  |
Derivative |  |  |
Derivative assets |  | 11,044 | 8,118
Derivative liabilities |  | (10,186) | (9,163)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government sponsored enterprise debt securities |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 424,863 | 311,024
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 187,388 | 141,420
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 688,712 | 791,088
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipal securities |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 206,422 | 250,448
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other residential mortgage-backed securities | Investment grade |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 61,908 | 53,918
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other commercial mortgage-backed securities | Investment grade |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  |  | 34,053
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Investment grade |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 156,978 | 115,182
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Non-investment grade |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | 10,025 | 8,153
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other securities |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  | $ 10,205 | 9,011
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  |  | 6,528
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Embedded derivative liabilities |  |  |
Derivative |  |  |
Derivative liabilities |  |  | (3,392)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Non-investment grade |  |  |
Available-for-sale investment securities |  |  |
Total available-for-sale investment securities |  |  | $ 6,528
[1] | Available-for-sale investment securities rated BBB- or higher by S&P or Baa3 or higher by Moody's are considered investment grade. Conversely, available-for-sale investment securities rated lower than BBB- by S&P or lower than Baa3 by Moody's are considered non-investment grade.

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