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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Securities available-for-sale: |  |
Less Than 12 Months | $ 341,191 | $ 594,827
12 Months or Longer | 579,143 | 270,524
Total | 920,334 | 865,351
Gross Unrealized Losses |  |
Less Than 12 Months | (14,452) | (28,967)
12 Months or Longer | (39,677) | (12,331)
Total | (54,129) | (41,298)
SBA loan pool securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 0 | 2,260
12 Months or Longer | 7,461 | 8,927
Total | 7,461 | 11,187
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (3)
12 Months or Longer | (43) | (51)
Total | (43) | (54)
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 81,708 | 40,206
12 Months or Longer | 0 | 0
Total | 81,708 | 40,206
Gross Unrealized Losses |  |
Less Than 12 Months | (1,205) | (225)
12 Months or Longer | 0 | 0
Total | (1,205) | (225)
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations |  |
Securities available-for-sale: |  |
Less Than 12 Months | 51,780 | 76,441
12 Months or Longer | 37,478 | 16,750
Total | 89,258 | 93,191
Gross Unrealized Losses |  |
Less Than 12 Months | (767) | (2,533)
12 Months or Longer | (5,733) | (3,351)
Total | (6,500) | (5,884)
Non-agency residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 71,394 | 80,492
12 Months or Longer | 40,114 | 0
Total | 111,508 | 80,492
Gross Unrealized Losses |  |
Less Than 12 Months | (1,734) | (10,340)
12 Months or Longer | (9,753) | 0
Total | (11,487) | (10,340)
Collateralized loan obligations |  |
Securities available-for-sale: |  |
Less Than 12 Months | 41,278 | 235,936
12 Months or Longer | 441,552 | 240,667
Total | 482,830 | 476,603
Gross Unrealized Losses |  |
Less Than 12 Months | (481) | (7,492)
12 Months or Longer | (7,222) | (8,108)
Total | (7,703) | (15,600)
Corporate debt securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 95,031 | 159,492
12 Months or Longer | 52,538 | 4,180
Total | 147,569 | 163,672
Gross Unrealized Losses |  |
Less Than 12 Months | (10,265) | (8,374)
12 Months or Longer | (16,926) | (821)
Total | $ (27,191) | $ (9,195)

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