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INVESTMENT SECURITIES - Summary of Investment Securities with Unrealized Losses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Fair Value    
Less Than 12 Months $ 5,225  
12 Months or Longer 0  
Total 5,225  
Gross Unrealized Losses    
Less Than 12 Months (193)  
12 Months or Longer 0  
Total (193)  
Fair Value    
Less Than 12 Months 141,657 $ 68,572
12 Months or Longer 10,651 23,567
Total 152,308 92,139
Gross Unrealized Losses    
Less Than 12 Months (1,211) (341)
12 Months or Longer (130) (277)
Total (1,341) (618)
Corporate bonds    
Fair Value    
Less Than 12 Months 5,225  
12 Months or Longer 0  
Total 5,225  
Gross Unrealized Losses    
Less Than 12 Months (193)  
12 Months or Longer 0  
Total (193)  
Private label residential mortgage-backed securities    
Fair Value    
Less Than 12 Months 160 372
12 Months or Longer 510 1,355
Total 670 1,727
Gross Unrealized Losses    
Less Than 12 Months 0 (9)
12 Months or Longer (2) (4)
Total (2) (13)
Agency mortgage-backed securities    
Fair Value    
Less Than 12 Months 141,497 68,200
12 Months or Longer 10,141 22,212
Total 151,638 90,412
Gross Unrealized Losses    
Less Than 12 Months (1,211) (332)
12 Months or Longer (128) (273)
Total $ (1,339) $ (605)