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INVESTMENTS (Schedule of Sale of AFS Investments) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]        
Proceeds from sales of investments $ 9,898 $ 0 $ 9,898 $ 0
Gross realized gains $ 31 $ 0 $ 31 $ 0