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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Securities available-for-sale:    
Less Than 12 Months $ 234,397 $ 594,827
12 Months or Longer 662,025 270,524
Total 896,422 865,351
Gross Unrealized Losses    
Less Than 12 Months (8,756) (28,967)
12 Months or Longer (43,168) (12,331)
Total (51,924) (41,298)
SBA loan pool securities    
Securities available-for-sale:    
Less Than 12 Months 0 2,260
12 Months or Longer 7,060 8,927
Total 7,060 11,187
Gross Unrealized Losses    
Less Than 12 Months 0 (3)
12 Months or Longer (27) (51)
Total (27) (54)
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities    
Securities available-for-sale:    
Less Than 12 Months 76,844 40,206
12 Months or Longer 0 0
Total 76,844 40,206
Gross Unrealized Losses    
Less Than 12 Months (2,942) (225)
12 Months or Longer 0 0
Total (2,942) (225)
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations    
Securities available-for-sale:    
Less Than 12 Months 50,151 76,441
12 Months or Longer 35,690 16,750
Total 85,841 93,191
Gross Unrealized Losses    
Less Than 12 Months (1,131) (2,533)
12 Months or Longer (6,733) (3,351)
Total (7,864) (5,884)
Non-agency residential mortgage-backed securities    
Securities available-for-sale:    
Less Than 12 Months 67,769 80,492
12 Months or Longer 37,191 0
Total 104,960 80,492
Gross Unrealized Losses    
Less Than 12 Months (3,112) (10,340)
12 Months or Longer (11,990) 0
Total (15,102) (10,340)
Collateralized loan obligations    
Securities available-for-sale:    
Less Than 12 Months 24,859 235,936
12 Months or Longer 441,944 240,667
Total 466,803 476,603
Gross Unrealized Losses    
Less Than 12 Months (141) (7,492)
12 Months or Longer (5,995) (8,108)
Total (6,136) (15,600)
Corporate debt securities    
Securities available-for-sale:    
Less Than 12 Months 14,774 159,492
12 Months or Longer 140,140 4,180
Total 154,914 163,672
Gross Unrealized Losses    
Less Than 12 Months (1,430) (8,374)
12 Months or Longer (18,423) (821)
Total $ (19,853) $ (9,195)