FAIR VALUE - RECURRING (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Marketable Securities	$ 111,836
Total (Gains) Losses	2
Recurring
Marketable Securities	111,836	$ 107,972
Total (Gains) Losses		208
Available-for-sale Securities
Marketable Securities	111,836	107,972
Corporate
Marketable Securities	28,043	20,938
Corporate | Recurring
Marketable Securities	28,043	20,938
Total (Gains) Losses		35
Corporate | Level 2 | Recurring
Marketable Securities	27,543	20,438
Corporate | Level 3 | Recurring
Marketable Securities	500	500
US Agencies
Marketable Securities	6,589	14,496
US Agencies | Recurring
Marketable Securities	6,589	14,496
Total (Gains) Losses		9
US Agencies | Level 2 | Recurring
Marketable Securities	6,589	14,496
US Agencies - MBS
Marketable Securities	34,280	34,526
US Agencies - MBS | Recurring
Marketable Securities	34,280	34,526
US Agencies - MBS | Level 2 | Recurring
Marketable Securities	34,280	34,526
Obligations of states and political subdivisions
Marketable Securities	42,924	38,012
Total (Gains) Losses	2
Obligations of states and political subdivisions | Recurring
Marketable Securities	42,924	38,012
Total (Gains) Losses		164
Obligations of states and political subdivisions | Level 2 | Recurring
Marketable Securities	42,093	37,109
Obligations of states and political subdivisions | Level 3 | Recurring
Marketable Securities	$ 831	$ 903