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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Securities available-for-sale:    
Less Than 12 Months $ 178,292 $ 112,563
12 Months or Longer 298,414 613,010
Total 476,706 725,573
Gross Unrealized Losses    
Less Than 12 Months (1,343) (477)
12 Months or Longer (2,856) (9,495)
Total (4,199) (9,972)
SBA loan pool securities    
Securities available-for-sale:    
Less Than 12 Months 16,223 17,354
12 Months or Longer 0 0
Total 16,223 17,354
Gross Unrealized Losses    
Less Than 12 Months (78) (82)
12 Months or Longer 0 0
Total (78) (82)
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations    
Securities available-for-sale:    
Less Than 12 Months 41,799 19,033
12 Months or Longer 0 0
Total 41,799 19,033
Gross Unrealized Losses    
Less Than 12 Months (799) (166)
12 Months or Longer 0 0
Total (799) (166)
Municipal securities    
Securities available-for-sale:    
Less Than 12 Months 28,382 11,401
12 Months or Longer 0 0
Total 28,382 11,401
Gross Unrealized Losses    
Less Than 12 Months (354) (4)
12 Months or Longer 0 0
Total (354) (4)
Collateralized loan obligations    
Securities available-for-sale:    
Less Than 12 Months 91,888 64,775
12 Months or Longer 298,414 613,010
Total 390,302 677,785
Gross Unrealized Losses    
Less Than 12 Months (112) (225)
12 Months or Longer (2,856) (9,495)
Total $ (2,968) $ (9,720)