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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Securities available-for-sale:    
Less Than 12 Months $ 179,838 $ 112,563
12 Months or Longer 427,177 613,010
Total 607,015 725,573
Gross Unrealized Losses    
Less Than 12 Months (3,119) (477)
12 Months or Longer (3,578) (9,495)
Total (6,697) (9,972)
SBA loan pool securities    
Securities available-for-sale:    
Less Than 12 Months 16,733 17,354
12 Months or Longer 0 0
Total 16,733 17,354
Gross Unrealized Losses    
Less Than 12 Months (79) (82)
12 Months or Longer 0 0
Total (79) (82)
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities    
Securities available-for-sale:    
Less Than 12 Months 47,975  
12 Months or Longer 0  
Total 47,975  
Gross Unrealized Losses    
Less Than 12 Months (419)  
12 Months or Longer 0  
Total (419)  
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations    
Securities available-for-sale:    
Less Than 12 Months 42,339 19,033
12 Months or Longer 0 0
Total 42,339 19,033
Gross Unrealized Losses    
Less Than 12 Months (1,466) (166)
12 Months or Longer 0 0
Total (1,466) (166)
Municipal securities    
Securities available-for-sale:    
Less Than 12 Months 30,357 11,401
12 Months or Longer 0 0
Total 30,357 11,401
Gross Unrealized Losses    
Less Than 12 Months (1,089) (4)
12 Months or Longer 0 0
Total (1,089) (4)
Collateralized loan obligations    
Securities available-for-sale:    
Less Than 12 Months 37,446 64,775
12 Months or Longer 427,177 613,010
Total 464,623 677,785
Gross Unrealized Losses    
Less Than 12 Months (54) (225)
12 Months or Longer (3,578) (9,495)
Total (3,632) $ (9,720)
Corporate debt securities    
Securities available-for-sale:    
Less Than 12 Months 4,988  
12 Months or Longer 0  
Total 4,988  
Gross Unrealized Losses    
Less Than 12 Months (12)  
12 Months or Longer 0  
Total $ (12)