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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value |  |
Less Than 12 Months | $ 190,527 | $ 1,377,901
12 Months or Longer | 668,808 | 457,632
Total | 859,335 | 1,835,533
Gross Unrealized Losses |  |
Less Than 12 Months | (2,223) | (9,613)
12 Months or Longer | (14,797) | (24,723)
Total | (17,020) | (34,336)
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 | 35,872 | 13,494
12 Months or Longer | 0 | 423,916
Total | 35,872 | 437,410
Gross Unrealized Losses |  |
Less Than 12 Months | (1,157) | (133)
12 Months or Longer | 0 | (24,412)
Total | (1,157) | (24,545)
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations |  |
Fair Value |  |
Less Than 12 Months | 73,379 |
12 Months or Longer | 0 |
Total | 73,379 |
Gross Unrealized Losses |  |
Less Than 12 Months | (260) |
12 Months or Longer | 0 |
Total | (260) |
Municipal securities |  |
Fair Value |  |
Less Than 12 Months | 31,723 |
12 Months or Longer | 0 |
Total | 31,723 |
Gross Unrealized Losses |  |
Less Than 12 Months | (359) |
12 Months or Longer | 0 |
Total | (359) |
Collateralized loan obligations |  |
Fair Value |  |
Less Than 12 Months | 49,553 | 1,364,317
12 Months or Longer | 668,808 | 32,790
Total | 718,361 | 1,397,107
Gross Unrealized Losses |  |
Less Than 12 Months | (447) | (9,480)
12 Months or Longer | (14,797) | (310)
Total | (15,244) | (9,790)
Non-agency residential mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months |  | 90
12 Months or Longer |  | 16
Total |  | 106
Gross Unrealized Losses |  |
Less Than 12 Months |  | 0
12 Months or Longer |  | 0
Total |  | $ 0
Corporate debt securities |  |
Fair Value |  |
Less Than 12 Months | 0 |
12 Months or Longer | 0 |
Total | 0 |
Gross Unrealized Losses |  |
Less Than 12 Months | 0 |
12 Months or Longer | 0 |
Total | $ 0 |

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