MARKETABLE SECURITIES - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Gross Unrealized Losses
Less Than 12 Months	$ (470)	$ (33)
12 Months or Longer	(72)	(327)
Total	(542)	(360)
Estimated Fair Value
Less Than 12 Months	71,349	20,559
12 Months or Longer	8,101	44,710
Total	79,450	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
Corporate bonds
Gross Unrealized Losses
Less Than 12 Months	(103)
12 Months or Longer	0	0
Total	(103)
Estimated Fair Value
Less Than 12 Months	11,430
12 Months or Longer	0	0
Total	11,430
Mortgage-backed securities
Gross Unrealized Losses
Less Than 12 Months	(13)	(25)
12 Months or Longer	(54)	(310)
Total	(67)	(335)
Estimated Fair Value
Less Than 12 Months	4,233	19,421
12 Months or Longer	5,840	42,116
Total	10,073	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	(66)
12 Months or Longer	(18)	(17)
Total	(84)	(17)
Estimated Fair Value
Less Than 12 Months	26,914
12 Months or Longer	2,261	2,594
Total	29,175	2,594
Gross Unrealized Losses
Less Than 12 Months		0
12 Months or Longer		0
Total		0
Estimated Fair Value
Less Than 12 Months		0
12 Months or Longer		0
Total		0
Municipal securities
Gross Unrealized Losses
Less Than 12 Months	(288)	(8)
12 Months or Longer	0
Total	(288)	(8)
Estimated Fair Value
Less Than 12 Months	28,772	1,138
12 Months or Longer	0
Total	$ 28,772	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