MARKETABLE SECURITIES - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Gross Unrealized Losses
Less Than 12 Months	$ (1)	$ (33)
12 Months or Longer	(3)	(327)
Total	(4)	(360)
Estimated Fair Value
Less Than 12 Months	1,760	20,559
12 Months or Longer	1,782	44,710
Total	3,542	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)
Total		(8)
Estimated Fair Value
Less Than 12 Months		1,138
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
Mortgage-backed securities
Gross Unrealized Losses
Less Than 12 Months	(1)	(25)
12 Months or Longer	0	(310)
Total	(1)	(335)
Estimated Fair Value
Less Than 12 Months	1,760	19,421
12 Months or Longer	0	42,116
Total	1,760	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
12 Months or Longer	(3)	(17)
Total	(3)	(17)
Estimated Fair Value
Less Than 12 Months	0
12 Months or Longer	1,782	2,594
Total	$ 1,782	$ 2,594