INVESTMENTS, Net Realized Gains and Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Gross realized gains and losses [Abstract]
Total gross realized gains	$ 6,231	$ 5,214	$ 4,548
Total gross realized losses	(2,615)	(788)	(1,667)
Net realized gains on investments	3,616	4,426	2,881
Proceeds from sales of investments securities	157,200	81,500	100,100
OTTI losses	400	0	0
Debt Securities [Member]
Gross realized gains and losses [Abstract]
Total gross realized gains	1,272	725	1,690
Total gross realized losses	(805)	(147)	(1,001)
Equity Securities [Member]
Gross realized gains and losses [Abstract]
Total gross realized gains	4,959	4,489	2,858
Total gross realized losses	$ (1,810)	$ (641)	$ (666)