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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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