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BONDS AVAILABLE-FOR-SALE (Realized Gains on Bond Sales and Redemptions) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Available-For-Sale Securities [Abstract]    
Net impairment recognized on bonds held at each period-end   $ (113)
Net impairment recognized on bonds sold/redeemed during each period $ (179)  
Gains recognized at time of sale or redemption 6,513 12,293
Total net gains on bonds $ 6,334 $ 12,180