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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Securities held-to-maturity: |  |
Amortized Cost | $ 0 | $ 884,234
Gross Unrealized Gains |  | 17,442
Gross Unrealized Losses |  | (1,933)
Securities held-to-maturity | 0 | 899,743
Securities available-for-sale: |  |
Amortized Cost | 2,567,393 | 2,396,968
Gross Unrealized Gains | 23,679 | 12,958
Gross Unrealized Losses | (15,603) | (28,438)
Fair Value | 2,575,469 | 2,381,488
SBA loan pool securities |  |
Securities available-for-sale: |  |
Amortized Cost | 1,056 | 1,221
Gross Unrealized Gains | 2 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 1,058 | 1,221
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 492,255 | 830,682
Gross Unrealized Gains | 10 | 9
Gross Unrealized Losses | (15,336) | (23,418)
Fair Value | 476,929 | 807,273
Non-agency residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 741 | 121,397
Gross Unrealized Gains | 16 | 18
Gross Unrealized Losses | (1) | (4,238)
Fair Value | 756 | 117,177
Non-agency commercial mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 305,172 |
Gross Unrealized Gains | 5,339 |
Gross Unrealized Losses | 0 |
Fair Value | 310,511 |
Collateralized loan obligations |  |
Securities available-for-sale: |  |
Amortized Cost | 1,691,455 | 1,395,094
Gross Unrealized Gains | 11,129 | 12,449
Gross Unrealized Losses | (266) | (674)
Fair Value | 1,702,318 | 1,406,869
Corporate debt securities |  |
Securities available-for-sale: |  |
Amortized Cost | 76,714 | 48,574
Gross Unrealized Gains | 7,183 | 482
Gross Unrealized Losses | 0 | (108)
Fair Value | $ 83,897 | 48,948
Corporate debt securities |  |
Securities held-to-maturity: |  |
Amortized Cost |  | 305,918
Gross Unrealized Gains |  | 2,949
Gross Unrealized Losses |  | (1,781)
Securities held-to-maturity |  | 307,086
Collateralized loan obligations |  |
Securities held-to-maturity: |  |
Amortized Cost |  | 338,226
Gross Unrealized Gains |  | 1,461
Gross Unrealized Losses |  | (61)
Securities held-to-maturity |  | 339,626
Non-agency commercial mortgage-backed securities |  |
Securities held-to-maturity: |  |
Amortized Cost |  | 240,090
Gross Unrealized Gains |  | 13,032
Gross Unrealized Losses |  | (91)
Securities held-to-maturity |  | $ 253,031

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