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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Fair Value    
Less Than 12 Months $ 676,015 $ 878,890
12 Months or Longer 0 0
Total 676,015 878,890
Gross Unrealized Losses    
Less Than 12 Months (19,510) (30,214)
12 Months or Longer 0 0
Total (19,510) (30,214)
Fair Value    
Less Than 12 Months 559,217 698,170
12 Months or Longer 6,527 7,235
Total 565,744 705,405
Gross Unrealized Losses    
Less Than 12 Months (2,696) (5,246)
12 Months or Longer (26) (124)
Total (2,722) (5,370)
Private label residential mortgage-backed securities    
Fair Value    
Less Than 12 Months 1,138 0
12 Months or Longer 0 403
Total 1,138 403
Gross Unrealized Losses    
Less Than 12 Months (4) 0
12 Months or Longer 0 (1)
Total (4) (1)
Corporate bonds    
Fair Value    
Less Than 12 Months 154,451 190,332
12 Months or Longer 0 0
Total 154,451 190,332
Gross Unrealized Losses    
Less Than 12 Months (9,292) (20,946)
12 Months or Longer 0 0
Total (9,292) (20,946)
Fair Value    
Less Than 12 Months 26,177 26,152
12 Months or Longer 0 0
Total 26,177 26,152
Gross Unrealized Losses    
Less Than 12 Months (476) (505)
12 Months or Longer 0 0
Total (476) (505)
Collateralized loan obligations    
Fair Value    
Less Than 12 Months 408,365 411,207
12 Months or Longer 0 0
Total 408,365 411,207
Gross Unrealized Losses    
Less Than 12 Months (7,950) (5,077)
12 Months or Longer 0 0
Total (7,950) (5,077)
Fair Value    
Less Than 12 Months 431,250 72,204
12 Months or Longer 0 0
Total 431,250 72,204
Gross Unrealized Losses    
Less Than 12 Months (1,944) (282)
12 Months or Longer 0 0
Total (1,944) (282)
Commercial mortgage-backed securities    
Fair Value    
Less Than 12 Months 113,199 277,351
12 Months or Longer 0 0
Total 113,199 277,351
Gross Unrealized Losses    
Less Than 12 Months (2,268) (4,191)
12 Months or Longer 0 0
Total (2,268) (4,191)
Agency mortgage-backed securities    
Fair Value    
Less Than 12 Months 100,652 599,814
12 Months or Longer 6,527 6,832
Total 107,179 606,646
Gross Unrealized Losses    
Less Than 12 Months (272) (4,459)
12 Months or Longer (26) (123)
Total $ (298) $ (4,582)