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FAIR VALUE OF FINANCIAL INSTRUMENTS- Additional Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Corporate securities        
Fair value, additional information        
AFS transferred to Level 3 $ 0 $ 0 $ 0 $ 6,749
Corporate securities | Minimum        
Fair value, additional information        
Discount rate (negative)     2.0  
Corporate securities | Maximum        
Fair value, additional information        
Discount rate     2.50%  
Corporate securities | Weighted average        
Fair value, additional information        
Discount rate     1.50%  
Non-agency mortgage-backed securities        
Fair value, additional information        
AFS transferred to Level 3       $ 2