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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value    
Less Than 12 Months $ 878,890  
12 Months or Longer 0  
Total 878,890  
Gross Unrealized Losses    
Less Than 12 Months (30,214)  
12 Months or Longer 0  
Total (30,214)  
Fair Value    
Less Than 12 Months 698,170 $ 68,572
12 Months or Longer 7,235 23,567
Total 705,405 92,139
Gross Unrealized Losses    
Less Than 12 Months (5,246) (341)
12 Months or Longer (124) (277)
Total (5,370) (618)
Corporate bonds    
Fair Value    
Less Than 12 Months 190,332  
12 Months or Longer 0  
Total 190,332  
Gross Unrealized Losses    
Less Than 12 Months (20,946)  
12 Months or Longer 0  
Total (20,946)  
Fair Value    
Less Than 12 Months 26,152  
12 Months or Longer 0  
Total 26,152  
Gross Unrealized Losses    
Less Than 12 Months (505)  
12 Months or Longer 0  
Total (505)  
Collateralized loan obligations    
Fair Value    
Less Than 12 Months 411,207  
12 Months or Longer 0  
Total 411,207  
Gross Unrealized Losses    
Less Than 12 Months (5,077)  
12 Months or Longer 0  
Total (5,077)  
Fair Value    
Less Than 12 Months 72,204  
12 Months or Longer 0  
Total 72,204  
Gross Unrealized Losses    
Less Than 12 Months (282)  
12 Months or Longer 0  
Total (282)  
Commercial mortgage-backed securities    
Fair Value    
Less Than 12 Months 277,351  
12 Months or Longer 0  
Total 277,351  
Gross Unrealized Losses    
Less Than 12 Months (4,191)  
12 Months or Longer 0  
Total (4,191)  
Private label residential mortgage-backed securities    
Fair Value    
Less Than 12 Months 0 372
12 Months or Longer 403 1,355
Total 403 1,727
Gross Unrealized Losses    
Less Than 12 Months 0 (9)
12 Months or Longer (1) (4)
Total (1) (13)
Agency mortgage-backed securities    
Fair Value    
Less Than 12 Months 599,814 68,200
12 Months or Longer 6,832 22,212
Total 606,646 90,412
Gross Unrealized Losses    
Less Than 12 Months (4,459) (332)
12 Months or Longer (123) (273)
Total $ (4,582) $ (605)