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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value |  |
Less Than 12 Months | $ 112,563 | $ 190,527
12 Months or Longer | 613,010 | 668,808
Total | 725,573 | 859,335
Gross Unrealized Losses |  |
Less Than 12 Months | (477) | (2,223)
12 Months or Longer | (9,495) | (14,797)
Total | (9,972) | (17,020)
SBA loan pools securities |  |
Fair Value |  |
Less Than 12 Months | 17,354 |
12 Months or Longer | 0 |
Total | 17,354 |
Gross Unrealized Losses |  |
Less Than 12 Months | (82) |
12 Months or Longer | 0 |
Total | (82) |
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Fair Value |  |
Less Than 12 Months | 19,033 | 35,872
12 Months or Longer | 0 | 0
Total | 19,033 | 35,872
Gross Unrealized Losses |  |
Less Than 12 Months | (166) | (1,157)
12 Months or Longer | 0 | 0
Total | (166) | (1,157)
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 | 11,401 | 31,723
12 Months or Longer | 0 | 0
Total | 11,401 | 31,723
Gross Unrealized Losses |  |
Less Than 12 Months | (4) | (359)
12 Months or Longer | 0 | 0
Total | (4) | (359)
Collateralized loan obligations |  |
Fair Value |  |
Less Than 12 Months | 64,775 | 49,553
12 Months or Longer | 613,010 | 668,808
Total | 677,785 | 718,361
Gross Unrealized Losses |  |
Less Than 12 Months | (225) | (447)
12 Months or Longer | (9,495) | (14,797)
Total | (9,720) | $ (15,244)
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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