MARKETABLE SECURITIES - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Gross Unrealized Losses
Less Than 12 Months	$ (95)	$ (33)
12 Months or Longer	(1)	(327)
Total	(96)	(360)
Estimated Fair Value
Less Than 12 Months	28,268	20,559
12 Months or Longer	106	44,710
Total	28,374	65,269
Gross Unrealized Losses
Less Than 12 Months		(1)
12 Months or Longer		(15)
Total		(16)
Estimated Fair Value
Less Than 12 Months		1,313
12 Months or Longer		7,791
Total		9,104
Municipal securities
Gross Unrealized Losses
Less Than 12 Months		(8)
12 Months or Longer		0
Total		(8)
Estimated Fair Value
Less Than 12 Months		1,138
12 Months or Longer		0
Total		1,138
Gross Unrealized Losses
Less Than 12 Months		(1)
12 Months or Longer		(2)
Total		(3)
Estimated Fair Value
Less Than 12 Months		1,313
12 Months or Longer		759
Total		2,072
Corporate bonds
Gross Unrealized Losses
Less Than 12 Months	(8)
12 Months or Longer	0
Total	(8)
Estimated Fair Value
Less Than 12 Months	2,493
12 Months or Longer	0
Total	2,493
Mortgage-backed securities
Gross Unrealized Losses
Less Than 12 Months	(87)	(25)
12 Months or Longer	0	(310)
Total	(87)	(335)
Estimated Fair Value
Less Than 12 Months	25,775	19,421
12 Months or Longer	0	42,116
Total	25,775	61,537
Gross Unrealized Losses
Less Than 12 Months		0
12 Months or Longer		(13)
Total		(13)
Estimated Fair Value
Less Than 12 Months		0
12 Months or Longer		7,032
Total		7,032
Collateralized mortgage obligations
Gross Unrealized Losses
Less Than 12 Months	0	0
12 Months or Longer	(1)	(17)
Total	(1)	(17)
Estimated Fair Value
Less Than 12 Months	0	0
12 Months or Longer	106	2,594
Total	$ 106	$ 2,594