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MARKETABLE SECURITIES - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Gross Unrealized Losses |  |
Less Than 12 Months | $ (945) | $ (2,483)
12 Months or Longer | (484) | (790)
Total | (1,429) | (3,273)
Estimated Fair Value |  |
Less Than 12 Months | 111,555 | 129,603
12 Months or Longer | 22,518 | 24,319
Total | 134,073 | 153,922
Gross Unrealized Losses |  |
Less Than 12 Months | (499) | (4,179)
12 Months or Longer | (631) | (521)
Total | (1,130) | (4,700)
Estimated Fair Value |  |
Less Than 12 Months | 49,596 | 118,926
12 Months or Longer | 8,312 | 2,350
Total | 57,908 | 121,276
Corporate bonds |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (8) | (377)
12 Months or Longer | 0 | 0
Total | (8) | (377)
Estimated Fair Value |  |
Less Than 12 Months | 2,981 | 22,529
12 Months or Longer | 0 | 0
Total | 2,981 | 22,529
Municipal securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (300) | (622)
12 Months or Longer | 0 | 0
Total | (300) | (622)
Estimated Fair Value |  |
Less Than 12 Months | 7,493 | 7,219
12 Months or Longer | 0 | 0
Total | 7,493 | 7,219
Mortgage-backed securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (569) | (1,047)
12 Months or Longer | (333) | (561)
Total | (902) | (1,608)
Estimated Fair Value |  |
Less Than 12 Months | 75,674 | 44,420
12 Months or Longer | 14,375 | 15,270
Total | 90,049 | 59,690
Collateralized mortgage obligations |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (68) | (437)
12 Months or Longer | (151) | (229)
Total | (219) | (666)
Estimated Fair Value |  |
Less Than 12 Months | 25,407 | 55,435
12 Months or Longer | 8,143 | 9,049
Total | 33,550 | 64,484
Municipal securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (406) | (3,889)
12 Months or Longer | (124) | 0
Total | (530) | (3,889)
Estimated Fair Value |  |
Less Than 12 Months | 38,442 | 98,943
12 Months or Longer | 6,015 | 0
Total | 44,457 | 98,943
Mortgage-backed securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (93) | (290)
12 Months or Longer | 0 | 0
Total | (93) | (290)
Estimated Fair Value |  |
Less Than 12 Months | 11,154 | 19,983
12 Months or Longer | 0 | 0
Total | 11,154 | 19,983
Collateralized mortgage obligations |  |
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or Longer | (507) | (521)
Total | (507) | (521)
Estimated Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or Longer | 2,297 | 2,350
Total | $ 2,297 | $ 2,350

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