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MARKETABLE SECURITIES - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Gross Unrealized Losses |  |
Less Than 12 Months | $ (1,799) | $ (2,483)
12 Months or Longer | (1,747) | (790)
Total | (3,546) | (3,273)
Estimated Fair Value |  |
Less Than 12 Months | 144,484 | 129,603
12 Months or Longer | 76,601 | 24,319
Total | 221,085 | 153,922
Gross Unrealized Losses |  |
Less Than 12 Months | (94) | (4,179)
12 Months or Longer | (354) | (521)
Total | (448) | (4,700)
Estimated Fair Value |  |
Less Than 12 Months | 15,729 | 118,926
12 Months or Longer | 29,708 | 2,350
Total | 45,437 | 121,276
Corporate bonds |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (50) | (377)
12 Months or Longer | 0 | 0
Total | (50) | (377)
Estimated Fair Value |  |
Less Than 12 Months | 8,019 | 22,529
12 Months or Longer | 0 | 0
Total | 8,019 | 22,529
Municipal securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (622)
12 Months or Longer | (200) | 0
Total | (200) | (622)
Estimated Fair Value |  |
Less Than 12 Months | 0 | 7,219
12 Months or Longer | 7,546 | 0
Total | 7,546 | 7,219
Mortgage-backed securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (658) | (1,047)
12 Months or Longer | (1,135) | (561)
Total | (1,793) | (1,608)
Estimated Fair Value |  |
Less Than 12 Months | 42,881 | 44,420
12 Months or Longer | 47,797 | 15,270
Total | 90,678 | 59,690
Collateralized mortgage obligations |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (1,091) | (437)
12 Months or Longer | (412) | (229)
Total | (1,503) | (666)
Estimated Fair Value |  |
Less Than 12 Months | 93,584 | 55,435
12 Months or Longer | 21,258 | 9,049
Total | 114,842 | 64,484
Municipal securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (37) | (3,889)
12 Months or Longer | (181) | 0
Total | (218) | (3,889)
Estimated Fair Value |  |
Less Than 12 Months | 9,230 | 98,943
12 Months or Longer | 19,961 | 0
Total | 29,191 | 98,943
Mortgage-backed securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (57) | (290)
12 Months or Longer | (173) | 0
Total | (230) | (290)
Estimated Fair Value |  |
Less Than 12 Months | 6,499 | 19,983
12 Months or Longer | 9,747 | 0
Total | 16,246 | 19,983
Collateralized mortgage obligations |  |
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or Longer | 0 | (521)
Total | 0 | (521)
Estimated Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or Longer | 0 | 2,350
Total | $ 0 | $ 2,350

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