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INVESTMENT SECURITIES - Summary of Securities Available-for-sale (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities available-for-sale: |  |
Amortized Cost | $ 2,026,686 | $ 2,567,393
Gross Unrealized Gains | 150 | 23,679
Gross Unrealized Losses | (34,336) | (15,603)
Fair Value | 1,992,500 | 2,575,469
SBA loan pool securities |  |
Securities available-for-sale: |  |
Amortized Cost | 911 | 1,056
Gross Unrealized Gains | 0 | 2
Gross Unrealized Losses | (1) | 0
Fair Value | 910 | 1,058
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 461,987 | 492,255
Gross Unrealized Gains | 0 | 10
Gross Unrealized Losses | (24,545) | (15,336)
Fair Value | 437,442 | 476,929
Non-agency residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 418 | 741
Gross Unrealized Gains | 9 | 16
Gross Unrealized Losses | 0 | (1)
Fair Value | 427 | 756
Non-agency commercial mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 132,199 | 305,172
Gross Unrealized Gains | 0 | 5,339
Gross Unrealized Losses | 0 | 0
Fair Value | 132,199 | 310,511
Collateralized loan obligations |  |
Securities available-for-sale: |  |
Amortized Cost | 1,431,171 | 1,691,455
Gross Unrealized Gains | 141 | 11,129
Gross Unrealized Losses | (9,790) | (266)
Fair Value | $ 1,421,522 | 1,702,318
Corporate debt securities |  |
Securities available-for-sale: |  |
Amortized Cost |  | 76,714
Gross Unrealized Gains |  | 7,183
Gross Unrealized Losses |  | 0
Fair Value |  | $ 83,897

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