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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Securities available-for-sale:    
Less Than 12 Months $ 245,541 $ 112,563
12 Months or Longer 290,896 613,010
Total 536,437 725,573
Gross Unrealized Losses    
Less Than 12 Months (2,337) (477)
12 Months or Longer (3,444) (9,495)
Total (5,781) (9,972)
SBA loan pool securities    
Securities available-for-sale:    
Less Than 12 Months 3,476 17,354
12 Months or Longer 11,945 0
Total 15,421 17,354
Gross Unrealized Losses    
Less Than 12 Months (6) (82)
12 Months or Longer (62) 0
Total (68) (82)
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities    
Securities available-for-sale:    
Less Than 12 Months 54,501  
12 Months or Longer 0  
Total 54,501  
Gross Unrealized Losses    
Less Than 12 Months (978)  
12 Months or Longer 0  
Total (978)  
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations    
Securities available-for-sale:    
Less Than 12 Months 77,262 19,033
12 Months or Longer 9,686 0
Total 86,948 19,033
Gross Unrealized Losses    
Less Than 12 Months (1,048) (166)
12 Months or Longer (484) 0
Total (1,532) (166)
Municipal securities    
Securities available-for-sale:    
Less Than 12 Months 43,346 11,401
12 Months or Longer 10,945 0
Total 54,291 11,401
Gross Unrealized Losses    
Less Than 12 Months (261) (4)
12 Months or Longer (444) 0
Total (705) (4)
Collateralized loan obligations    
Securities available-for-sale:    
Less Than 12 Months 66,956 64,775
12 Months or Longer 258,320 613,010
Total 325,276 677,785
Gross Unrealized Losses    
Less Than 12 Months (44) (225)
12 Months or Longer (2,454) (9,495)
Total $ (2,498) $ (9,720)