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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Securities available-for-sale: |  |
Less Than 12 Months | $ 245,541 | $ 112,563
12 Months or Longer | 290,896 | 613,010
Total | 536,437 | 725,573
Gross Unrealized Losses |  |
Less Than 12 Months | (2,337) | (477)
12 Months or Longer | (3,444) | (9,495)
Total | (5,781) | (9,972)
SBA loan pool securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 3,476 | 17,354
12 Months or Longer | 11,945 | 0
Total | 15,421 | 17,354
Gross Unrealized Losses |  |
Less Than 12 Months | (6) | (82)
12 Months or Longer | (62) | 0
Total | (68) | (82)
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 54,501 |
12 Months or Longer | 0 |
Total | 54,501 |
Gross Unrealized Losses |  |
Less Than 12 Months | (978) |
12 Months or Longer | 0 |
Total | (978) |
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations |  |
Securities available-for-sale: |  |
Less Than 12 Months | 77,262 | 19,033
12 Months or Longer | 9,686 | 0
Total | 86,948 | 19,033
Gross Unrealized Losses |  |
Less Than 12 Months | (1,048) | (166)
12 Months or Longer | (484) | 0
Total | (1,532) | (166)
Municipal securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 43,346 | 11,401
12 Months or Longer | 10,945 | 0
Total | 54,291 | 11,401
Gross Unrealized Losses |  |
Less Than 12 Months | (261) | (4)
12 Months or Longer | (444) | 0
Total | (705) | (4)
Collateralized loan obligations |  |
Securities available-for-sale: |  |
Less Than 12 Months | 66,956 | 64,775
12 Months or Longer | 258,320 | 613,010
Total | 325,276 | 677,785
Gross Unrealized Losses |  |
Less Than 12 Months | (44) | (225)
12 Months or Longer | (2,454) | (9,495)
Total | $ (2,498) | $ (9,720)

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