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INVESTMENTS (Schedule of Unrealized Appreciation) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Investments [Abstract]    
Net change in unrealized gains (losses) on available-for-sale securities before deferred tax $ (3,268) $ 1,402
Deferred income tax 686 (476)
Net change in unrealized gains (losses) on available-for-sale securities $ (2,582) $ 926