FAIR VALUE MEASUREMENTS - RECURRING (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Marketable Securities	$ 106,830	$ 107,972
Recurring
Marketable Securities	106,830	107,972
Available-for-sale Securities
Marketable Securities	106,830	107,972
Corporate
Marketable Securities	21,232	20,938
Corporate | Recurring
Marketable Securities	21,232	20,938
Corporate | Level 2 | Recurring
Marketable Securities	20,732	20,438
Corporate | Level 3 | Recurring
Marketable Securities	500	500
US Agencies
Marketable Securities	9,615	14,496
US Agencies | Recurring
Marketable Securities	9,615	14,496
US Agencies | Level 2 | Recurring
Marketable Securities	9,615	14,496
US Agencies - MBS
Marketable Securities	32,497	34,526
US Agencies - MBS | Recurring
Marketable Securities	32,497	34,526
US Agencies - MBS | Level 2 | Recurring
Marketable Securities	32,497	34,526
Obligations of states and political subdivisions
Marketable Securities	43,486	38,012
Obligations of states and political subdivisions | Recurring
Marketable Securities	43,486	38,012
Obligations of states and political subdivisions | Level 2 | Recurring
Marketable Securities	42,644	37,024
Obligations of states and political subdivisions | Level 3 | Recurring
Marketable Securities	$ 842	$ 903