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INVESTMENT SECURITIES - Summary of Securities Available-for-sale (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Securities available-for-sale: |  |
Amortized Cost | $ 929,449 | $ 2,026,686
Gross Unrealized Gains | 151 | 150
Gross Unrealized Losses | (17,020) | (34,336)
Fair Value | 912,580 | 1,992,500
SBA loan pool securities |  |
Securities available-for-sale: |  |
Amortized Cost |  | 911
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (1)
Fair Value |  | 910
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 37,613 | 461,987
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,157) | (24,545)
Fair Value | 36,456 | 437,442
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations |  |
Securities available-for-sale: |  |
Amortized Cost | 91,543 |
Gross Unrealized Gains | 16 |
Gross Unrealized Losses | (260) |
Fair Value | 91,299 |
Municipal securities |  |
Securities available-for-sale: |  |
Amortized Cost | 52,997 |
Gross Unrealized Gains | 51 |
Gross Unrealized Losses | (359) |
Fair Value | 52,689 |
Non-agency residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 191 | 418
Gross Unrealized Gains | 5 | 9
Gross Unrealized Losses | 0 | 0
Fair Value | 196 | 427
Non-agency commercial mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost |  | 132,199
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Fair Value |  | 132,199
Collateralized loan obligations |  |
Securities available-for-sale: |  |
Amortized Cost | 733,605 | 1,431,171
Gross Unrealized Gains | 0 | 141
Gross Unrealized Losses | (15,244) | (9,790)
Fair Value | 718,361 | $ 1,421,522
Corporate debt securities |  |
Securities available-for-sale: |  |
Amortized Cost | 13,500 |
Gross Unrealized Gains | 79 |
Gross Unrealized Losses | 0 |
Fair Value | $ 13,579 |

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