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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Value    
Less Than 12 Months $ 346,432  
12 Months or Longer 0  
Total 346,432  
Gross Unrealized Losses    
Less Than 12 Months (3,504)  
12 Months or Longer 0  
Total (3,504)  
Fair Value    
Less Than 12 Months 68,922 $ 68,572
12 Months or Longer 7,688 23,567
Total 76,610 92,139
Gross Unrealized Losses    
Less Than 12 Months (515) (341)
12 Months or Longer (64) (277)
Total (579) (618)
Private label residential mortgage-backed securities    
Fair Value    
Less Than 12 Months 0 372
12 Months or Longer 442 1,355
Total 442 1,727
Gross Unrealized Losses    
Less Than 12 Months 0 (9)
12 Months or Longer (2) (4)
Total (2) (13)
Corporate bonds    
Fair Value    
Less Than 12 Months 147,632  
12 Months or Longer 0  
Total 147,632  
Gross Unrealized Losses    
Less Than 12 Months (2,919)  
12 Months or Longer 0  
Total (2,919)  
Fair Value    
Less Than 12 Months 19,747  
12 Months or Longer 0  
Total 19,747  
Gross Unrealized Losses    
Less Than 12 Months (415)  
12 Months or Longer 0  
Total (415)  
Collateralized loan obligations    
Fair Value    
Less Than 12 Months 198,800  
12 Months or Longer 0  
Total 198,800  
Gross Unrealized Losses    
Less Than 12 Months (585)  
12 Months or Longer 0  
Total (585)  
Commercial mortgage-backed securities    
Fair Value    
Less Than 12 Months 33,949  
12 Months or Longer 0  
Total 33,949  
Gross Unrealized Losses    
Less Than 12 Months (31)  
12 Months or Longer 0  
Total (31)  
Agency mortgage-backed securities    
Fair Value    
Less Than 12 Months 15,226 68,200
12 Months or Longer 7,246 22,212
Total 22,472 90,412
Gross Unrealized Losses    
Less Than 12 Months (69) (332)
12 Months or Longer (62) (273)
Total $ (131) $ (605)