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MARKETABLE SECURITIES - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Gross Unrealized Losses |  |
Less Than 12 Months | $ (800) | $ (2,483)
12 Months or Longer | (750) | (790)
Total | (1,550) | (3,273)
Estimated Fair Value |  |
Less Than 12 Months | 115,627 | 129,603
12 Months or Longer | 28,899 | 24,319
Total | 144,526 | 153,922
Gross Unrealized Losses |  |
Less Than 12 Months | (324) | (4,179)
12 Months or Longer | (761) | (521)
Total | (1,085) | (4,700)
Estimated Fair Value |  |
Less Than 12 Months | 49,652 | 118,926
12 Months or Longer | 15,357 | 2,350
Total | 65,009 | 121,276
Corporate bonds |  |
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (377)
12 Months or Longer | 0 | 0
Total | 0 | (377)
Estimated Fair Value |  |
Less Than 12 Months | 0 | 22,529
12 Months or Longer | 0 | 0
Total | 0 | 22,529
Municipal securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (622)
12 Months or Longer | (305) | 0
Total | (305) | (622)
Estimated Fair Value |  |
Less Than 12 Months | 0 | 7,219
12 Months or Longer | 7,464 | 0
Total | 7,464 | 7,219
Mortgage-backed securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (556) | (1,047)
12 Months or Longer | (307) | (561)
Total | (863) | (1,608)
Estimated Fair Value |  |
Less Than 12 Months | 72,802 | 44,420
12 Months or Longer | 13,913 | 15,270
Total | 86,715 | 59,690
Collateralized mortgage obligations |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (244) | (437)
12 Months or Longer | (138) | (229)
Total | (382) | (666)
Estimated Fair Value |  |
Less Than 12 Months | 42,825 | 55,435
12 Months or Longer | 7,522 | 9,049
Total | 50,347 | 64,484
Municipal securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (258) | (3,889)
12 Months or Longer | (258) | 0
Total | (516) | (3,889)
Estimated Fair Value |  |
Less Than 12 Months | 39,090 | 98,943
12 Months or Longer | 13,085 | 0
Total | 52,175 | 98,943
Mortgage-backed securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (66) | (290)
12 Months or Longer | 0 | 0
Total | (66) | (290)
Estimated Fair Value |  |
Less Than 12 Months | 10,562 | 19,983
12 Months or Longer | 0 | 0
Total | 10,562 | 19,983
Collateralized mortgage obligations |  |
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or Longer | (503) | (521)
Total | (503) | (521)
Estimated Fair Value |  |
Less Than 12 Months | 0 | 0
12 Months or Longer | 2,272 | 2,350
Total | $ 2,272 | $ 2,350

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