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MARKETABLE SECURITIES - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Gross Unrealized Losses
Less Than 12 Months	$ (638)	$ (1,799)
12 Months or Longer	(6,459)	(1,747)
Total	(7,097)	(3,546)
Estimated Fair Value
Less Than 12 Months	29,860	144,484
12 Months or Longer	191,232	76,601
Total	221,092	221,085
Gross Unrealized Losses
Less Than 12 Months	(561)	(94)
12 Months or Longer	(1,061)	(354)
Total	(1,622)	(448)
Estimated Fair Value
Less Than 12 Months	59,442	15,729
12 Months or Longer	38,828	29,708
Total	98,270	45,437
Corporate bonds
Gross Unrealized Losses
Less Than 12 Months	(453)	(50)
12 Months or Longer	(336)	0
Total	(789)	(50)
Estimated Fair Value
Less Than 12 Months	11,236	8,019
12 Months or Longer	7,718	0
Total	18,954	8,019
Municipal securities
Gross Unrealized Losses
Less Than 12 Months	(17)	0
12 Months or Longer	(243)	(200)
Total	(260)	(200)
Estimated Fair Value
Less Than 12 Months	2,219	0
12 Months or Longer	7,407	7,546
Total	9,626	7,546
Gross Unrealized Losses
Less Than 12 Months	(512)	(37)
12 Months or Longer	(582)	(181)
Total	(1,094)	(218)
Estimated Fair Value
Less Than 12 Months	55,793	9,230
12 Months or Longer	26,511	19,961
Total	82,304	29,191
Mortgage-backed securities
Gross Unrealized Losses
Less Than 12 Months	(89)	(658)
12 Months or Longer	(3,587)	(1,135)
Total	(3,676)	(1,793)
Estimated Fair Value
Less Than 12 Months	7,173	42,881
12 Months or Longer	76,717	47,797
Total	83,890	90,678
Gross Unrealized Losses
Less Than 12 Months	(21)	(57)
12 Months or Longer	(479)	(173)
Total	(500)	(230)
Estimated Fair Value
Less Than 12 Months	1,478	6,499
12 Months or Longer	12,317	9,747
Total	13,795	16,246
Collateralized mortgage obligations
Gross Unrealized Losses
Less Than 12 Months	(79)	(1,091)
12 Months or Longer	(2,293)	(412)
Total	(2,372)	(1,503)
Estimated Fair Value
Less Than 12 Months	9,232	93,584
12 Months or Longer	99,390	21,258
Total	108,622	114,842
Gross Unrealized Losses
Less Than 12 Months	(28)	0
12 Months or Longer	0	0
Total	(28)	0
Estimated Fair Value
Less Than 12 Months	2,171	0
12 Months or Longer	0	0
Total	$ 2,171	$ 0

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