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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Securities available-for-sale:    
Less Than 12 Months $ 116,475 $ 190,527
12 Months or Longer 621,559 668,808
Total 738,034 859,335
Gross Unrealized Losses    
Less Than 12 Months (1,025) (2,223)
12 Months or Longer (17,046) (14,797)
Total (18,071) (17,020)
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities    
Securities available-for-sale:    
Less Than 12 Months 10,153 35,872
12 Months or Longer 0 0
Total 10,153 35,872
Gross Unrealized Losses    
Less Than 12 Months (36) (1,157)
12 Months or Longer 0 0
Total (36) (1,157)
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations    
Securities available-for-sale:    
Less Than 12 Months   73,379
12 Months or Longer   0
Total   73,379
Gross Unrealized Losses    
Less Than 12 Months   (260)
12 Months or Longer   0
Total   (260)
Municipal securities    
Securities available-for-sale:    
Less Than 12 Months 11,381 31,723
12 Months or Longer 0 0
Total 11,381 31,723
Gross Unrealized Losses    
Less Than 12 Months (30) (359)
12 Months or Longer 0 0
Total (30) (359)
Collateralized loan obligations    
Securities available-for-sale:    
Less Than 12 Months 64,372 49,553
12 Months or Longer 621,559 668,808
Total 685,931 718,361
Gross Unrealized Losses    
Less Than 12 Months (628) (447)
12 Months or Longer (17,046) (14,797)
Total (17,674) $ (15,244)
Corporate debt securities    
Securities available-for-sale:    
Less Than 12 Months 17,218  
12 Months or Longer 0  
Total 17,218  
Gross Unrealized Losses    
Less Than 12 Months (282)  
12 Months or Longer 0  
Total $ (282)