MARKETABLE SECURITIES - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Gross Unrealized Losses
Less Than 12 Months	$ (926)	$ (95)
12 Months or Longer	0	(1)
Total	(926)	(96)
Estimated Fair Value
Less Than 12 Months	97,362	28,268
12 Months or Longer	0	106
Total	97,362	28,374
Corporate bonds
Gross Unrealized Losses
Less Than 12 Months	(78)	(8)
12 Months or Longer	0
Total	(78)	(8)
Estimated Fair Value
Less Than 12 Months	7,708	2,493
12 Months or Longer	0
Total	7,708	2,493
Mortgage-backed securities
Gross Unrealized Losses
Less Than 12 Months	(794)	(87)
12 Months or Longer	0
Total	(794)	(87)
Estimated Fair Value
Less Than 12 Months	81,619	25,775
12 Months or Longer	0
Total	81,619	25,775
Collateralized mortgage obligations
Gross Unrealized Losses
Less Than 12 Months	(14)
12 Months or Longer	0	(1)
Total	(14)	(1)
Estimated Fair Value
Less Than 12 Months	3,549
12 Months or Longer	0	106
Total	3,549	$ 106
Municipal securities
Gross Unrealized Losses
Less Than 12 Months	(40)
12 Months or Longer	0
Total	(40)
Estimated Fair Value
Less Than 12 Months	4,486
12 Months or Longer	0
Total	$ 4,486