INVESTMENTS (Aging of Gross Unrealized Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
United States government obligations and authorities
Fair value [Abstract]
Less than 12 months	$ 51,384	$ 25,521
12 Months or Longer	600	0
Total	51,984	25,521
Gross unrealized losses [Abstract]
Less than 12 months	931	38
12 Months or Longer	8	0
Total	939	38
Obligations of states and political subdivisions
Fair value [Abstract]
Less than 12 months	6,494
12 Months or Longer	0
Total	6,494
Gross unrealized losses [Abstract]
Less than 12 months	153
12 Months or Longer	0
Total	153
Corporate securities
Fair value [Abstract]
Less than 12 months	88,639	7,989
12 Months or Longer	2,881	0
Total	91,520	7,989
Gross unrealized losses [Abstract]
Less than 12 months	2,938	79
12 Months or Longer	37	0
Total	2,975	79
International securities
Fair value [Abstract]
Less than 12 months	6,865	2,175
12 Months or Longer	1,258	132
Total	8,123	2,307
Gross unrealized losses [Abstract]
Less than 12 months	250	16
12 Months or Longer	0	1
Total	250	17
Debt Securities
Fair value [Abstract]
Less than 12 months	153,382	35,685
12 Months or Longer	4,739	132
Total	158,121	35,817
Gross unrealized losses [Abstract]
Less than 12 months	4,272	133
12 Months or Longer	45	1
Total	$ 4,317	$ 134