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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Securities available-for-sale: |  |
Less Than 12 Months | $ 418,718 | $ 284,581
12 Months or Longer | 281,153 | 296,109
Total | 699,871 | 580,690
Gross Unrealized Losses |  |
Less Than 12 Months | (9,696) | (3,459)
12 Months or Longer | (5,947) | (3,885)
Total | (15,643) | (7,344)
SBA loan pool securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 0 | 0
12 Months or Longer | 13,810 | 14,591
Total | 13,810 | 14,591
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or Longer | (108) | (88)
Total | (108) | (88)
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 11,733 | 67,588
12 Months or Longer | 0 | 0
Total | 11,733 | 67,588
Gross Unrealized Losses |  |
Less Than 12 Months | (351) | (1,311)
12 Months or Longer | 0 | 0
Total | (351) | (1,311)
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations |  |
Securities available-for-sale: |  |
Less Than 12 Months | 84,047 | 85,290
12 Months or Longer | 15,723 | 17,754
Total | 99,770 | 103,044
Gross Unrealized Losses |  |
Less Than 12 Months | (2,866) | (1,184)
12 Months or Longer | (2,184) | (904)
Total | (5,050) | (2,088)
Non-agency residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 50,462 |
12 Months or Longer | 0 |
Total | 50,462 |
Gross Unrealized Losses |  |
Less Than 12 Months | (3,955) |
12 Months or Longer | 0 |
Total | (3,955) |
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)
Corporate debt securities |  |
Securities available-for-sale: |  |
Less Than 12 Months | 46,123 | 4,993
12 Months or Longer | 0 | 0
Total | 46,123 | 4,993
Gross Unrealized Losses |  |
Less Than 12 Months | (1,377) | (7)
12 Months or Longer | 0 | 0
Total | (1,377) | (7)
Collateralized loan obligations |  |
Securities available-for-sale: |  |
Less Than 12 Months | 226,353 | 81,962
12 Months or Longer | 251,620 | 253,002
Total | 477,973 | 334,964
Gross Unrealized Losses |  |
Less Than 12 Months | (1,147) | (38)
12 Months or Longer | (3,655) | (2,273)
Total | $ (4,802) | $ (2,311)

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