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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Securities available-for-sale: |  |
Less Than 12 Months | $ 563,546 | $ 284,581
12 Months or Longer | 278,469 | 296,109
Total | 842,015 | 580,690
Gross Unrealized Losses |  |
Less Than 12 Months | (34,978) | (3,459)
12 Months or Longer | (15,848) | (3,885)
Total | (50,826) | (7,344)
SBA loan pool securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 0 | 0
12 Months or Longer | 9,474 | 14,591
Total | 9,474 | 14,591
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or Longer | (54) | (88)
Total | (54) | (88)
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 10,696 | 67,588
12 Months or Longer | 0 | 0
Total | 10,696 | 67,588
Gross Unrealized Losses |  |
Less Than 12 Months | (1,316) | (1,311)
12 Months or Longer | 0 | 0
Total | (1,316) | (1,311)
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations |  |
Securities available-for-sale: |  |
Less Than 12 Months | 110,864 | 85,290
12 Months or Longer | 30,293 | 17,754
Total | 141,157 | 103,044
Gross Unrealized Losses |  |
Less Than 12 Months | (4,705) | (1,184)
12 Months or Longer | (5,720) | (904)
Total | (10,425) | (2,088)
Non-agency residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 41,514 |
12 Months or Longer | 0 |
Total | 41,514 |
Gross Unrealized Losses |  |
Less Than 12 Months | (10,562) |
12 Months or Longer | 0 |
Total | (10,562) |
Municipal securities |  |
Securities available-for-sale: |  |
Less Than 12 Months |  | 44,748
12 Months or Longer |  | 10,762
Total |  | 55,510
Gross Unrealized Losses |  |
Less Than 12 Months |  | (919)
12 Months or Longer |  | (620)
Total |  | (1,539)
Collateralized loan obligations |  |
Securities available-for-sale: |  |
Less Than 12 Months | 233,975 | 81,962
12 Months or Longer | 238,702 | 253,002
Total | 472,677 | 334,964
Gross Unrealized Losses |  |
Less Than 12 Months | (10,025) | (38)
12 Months or Longer | (10,074) | (2,273)
Total | (20,099) | (2,311)
Corporate debt securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 166,497 | 4,993
12 Months or Longer | 0 | 0
Total | 166,497 | 4,993
Gross Unrealized Losses |  |
Less Than 12 Months | (8,370) | (7)
12 Months or Longer | 0 | 0
Total | $ (8,370) | $ (7)

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