INVESTMENTS, Aging of Gross Unrealized Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Fair value [Abstract]
Less than 12 months	$ 18,466		$ 18,466		$ 154,742
12 months or longer	7,990		7,990		4,614
Total fair value	26,456		26,456		159,356
Gross unrealized losses [Abstract]
Less than 12 months	1,086		1,086		3,804
12 months or longer	248		248		145
Total gross unrealized losses	1,334		1,334		3,949
OTTI losses	300	$ 0	300	$ 0
Debt Securities [Member]
Fair value [Abstract]
Less than 12 months	9,105		9,105		142,952
12 months or longer	6,745		6,745		4,530
Total fair value	15,850		15,850		147,482
Gross unrealized losses [Abstract]
Less than 12 months	51		51		1,954
12 months or longer	115		115		139
Total gross unrealized losses	166		166		2,093
United States Government Obligations and Authorities [Member]
Fair value [Abstract]
Less than 12 months	0		0		30,464
12 months or longer	128		128		659
Total fair value	128		128		31,123
Gross unrealized losses [Abstract]
Less than 12 months	0		0		303
12 months or longer	1		1		17
Total gross unrealized losses	1		1		320
Obligations of States and Political Subdivisions [Member]
Fair value [Abstract]
Less than 12 months	2,372		2,372		16,652
12 months or longer	1,025		1,025		0
Total fair value	3,397		3,397		16,652
Gross unrealized losses [Abstract]
Less than 12 months	1		1		40
12 months or longer	1		1		0
Total gross unrealized losses	2		2		40
Corporate [Member]
Fair value [Abstract]
Less than 12 months	6,733		6,733		87,176
12 months or longer	3,587		3,587		3,590
Total fair value	10,320		10,320		90,766
Gross unrealized losses [Abstract]
Less than 12 months	50		50		1,420
12 months or longer	72		72		70
Total gross unrealized losses	122		122		1,490
International [Member]
Fair value [Abstract]
Less than 12 months	0		0		8,660
12 months or longer	2,005		2,005		281
Total fair value	2,005		2,005		8,941
Gross unrealized losses [Abstract]
Less than 12 months	0		0		191
12 months or longer	41		41		52
Total gross unrealized losses	41		41		243
Equity Securities [Member]
Fair value [Abstract]
Less than 12 months	9,361		9,361		11,790
12 months or longer	1,245		1,245		84
Total fair value	10,606		10,606		11,874
Gross unrealized losses [Abstract]
Less than 12 months	1,035		1,035		1,850
12 months or longer	133		133		6
Total gross unrealized losses	$ 1,168		$ 1,168		$ 1,856