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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value |  |
Less Than 12 Months | $ 1,377,901 | $ 109,214
12 Months or Longer | 457,632 | 470,240
Total | 1,835,533 | 579,454
Gross Unrealized Losses |  |
Less Than 12 Months | (9,613) | (301)
12 Months or Longer | (24,723) | (15,302)
Total | (34,336) | (15,603)
SBA loan pool securities |  |
Fair Value |  |
Less Than 12 Months | 0 |
12 Months or Longer | 910 |
Total | 910 |
Gross Unrealized Losses |  |
Less Than 12 Months | 0 |
12 Months or Longer | (1) |
Total | (1) |
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 13,494 | 4,880
12 Months or Longer | 423,916 | 470,092
Total | 437,410 | 474,972
Gross Unrealized Losses |  |
Less Than 12 Months | (133) | (35)
12 Months or Longer | (24,412) | (15,301)
Total | (24,545) | (15,336)
Non-agency residential mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 90 | 0
12 Months or Longer | 16 | 148
Total | 106 | 148
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or Longer | 0 | (1)
Total | 0 | (1)
Collateralized loan obligations |  |
Fair Value |  |
Less Than 12 Months | 1,364,317 | 104,334
12 Months or Longer | 32,790 | 0
Total | 1,397,107 | 104,334
Gross Unrealized Losses |  |
Less Than 12 Months | (9,480) | (266)
12 Months or Longer | (310) | 0
Total | $ (9,790) | $ (266)

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