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TRADING SECURITY (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Trading Securities [Abstract]      
Amortized cost $ 11,400 $ 12,000  
Fair value 13,229 14,189  
Unrealized gains (losses) $ (400) $ (200) $ 600