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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)