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MARKETABLE SECURITIES - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Gross Unrealized Losses
Less Than 12 Months	$ (3,308)	$ (1,799)
12 Months or Longer	(6,223)	(1,747)
Total	(9,531)	(3,546)
Estimated Fair Value
Less Than 12 Months	110,989	144,484
12 Months or Longer	120,872	76,601
Total	231,861	221,085
Gross Unrealized Losses
Less Than 12 Months	(1,910)	(94)
12 Months or Longer	(1,166)	(354)
Total	(3,076)	(448)
Estimated Fair Value
Less Than 12 Months	84,534	15,729
12 Months or Longer	28,092	29,708
Total	112,626	45,437
Corporate bonds
Gross Unrealized Losses
Less Than 12 Months	(648)	(50)
12 Months or Longer	0	0
Total	(648)	(50)
Estimated Fair Value
Less Than 12 Months	19,114	8,019
12 Months or Longer	0	0
Total	19,114	8,019
Municipal securities
Gross Unrealized Losses
Less Than 12 Months	(65)	0
12 Months or Longer	(386)	(200)
Total	(451)	(200)
Estimated Fair Value
Less Than 12 Months	7,557	0
12 Months or Longer	7,289	7,546
Total	14,846	7,546
Gross Unrealized Losses
Less Than 12 Months	(1,633)	(37)
12 Months or Longer	(787)	(181)
Total	(2,420)	(218)
Estimated Fair Value
Less Than 12 Months	75,935	9,230
12 Months or Longer	20,088	19,961
Total	96,023	29,191
Mortgage-backed securities
Gross Unrealized Losses
Less Than 12 Months	(469)	(658)
12 Months or Longer	(3,978)	(1,135)
Total	(4,447)	(1,793)
Estimated Fair Value
Less Than 12 Months	15,439	42,881
12 Months or Longer	71,322	47,797
Total	86,761	90,678
Gross Unrealized Losses
Less Than 12 Months	(232)	(57)
12 Months or Longer	(379)	(173)
Total	(611)	(230)
Estimated Fair Value
Less Than 12 Months	6,236	6,499
12 Months or Longer	8,004	9,747
Total	14,240	16,246
Collateralized mortgage obligations
Gross Unrealized Losses
Less Than 12 Months	(2,126)	(1,091)
12 Months or Longer	(1,859)	(412)
Total	(3,985)	(1,503)
Estimated Fair Value
Less Than 12 Months	68,879	93,584
12 Months or Longer	42,261	21,258
Total	111,140	114,842
Gross Unrealized Losses
Less Than 12 Months	(45)	0
12 Months or Longer	0	0
Total	(45)	0
Estimated Fair Value
Less Than 12 Months	2,363	0
12 Months or Longer	0	0
Total	$ 2,363	$ 0

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