INVESTMENTS, Net Realized Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Gross realized gains and losses [Abstract]
Total gross realized gains	$ 1,041	$ 1,180	$ 3,082	$ 3,089
Total gross realized losses	(1,034)	(267)	(2,148)	(472)
Net realized gains on investments	7	913	934	2,617
Proceeds from sales of available-for-sale investment securities	34,900	30,300	99,400	80,200
Debt Securities [Member]
Gross realized gains and losses [Abstract]
Total gross realized gains	624	265	1,927	747
Total gross realized losses	(55)	(224)	(595)	(326)
Equity Securities [Member]
Gross realized gains and losses [Abstract]
Total gross realized gains	417	915	1,155	2,342
Total gross realized losses	$ (979)	$ (43)	$ (1,553)	$ (146)