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MARKETABLE SECURITIES - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Gross Unrealized Losses |  |
Less Than 12 Months | $ 0 | $ (638)
12 Months or Longer | (588) | (6,459)
Total | (588) | (7,097)
Estimated Fair Value |  |
Less Than 12 Months | 0 | 29,860
12 Months or Longer | 67,157 | 191,232
Total | 67,157 | 221,092
Gross Unrealized Losses |  |
Less Than 12 Months | (6) | (561)
12 Months or Longer | (45) | (1,061)
Total | (51) | (1,622)
Estimated Fair Value |  |
Less Than 12 Months | 3,029 | 59,442
12 Months or Longer | 8,050 | 38,828
Total | 11,079 | 98,270
Corporate bonds |  |
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (453)
12 Months or Longer | 0 | (336)
Total | 0 | (789)
Estimated Fair Value |  |
Less Than 12 Months | 0 | 11,236
12 Months or Longer | 0 | 7,718
Total | 0 | 18,954
Mortgage-backed securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (89)
12 Months or Longer | (555) | (3,587)
Total | (555) | (3,676)
Estimated Fair Value |  |
Less Than 12 Months | 0 | 7,173
12 Months or Longer | 64,192 | 76,717
Total | 64,192 | 83,890
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (21)
12 Months or Longer | (43) | (479)
Total | (43) | (500)
Estimated Fair Value |  |
Less Than 12 Months | 0 | 1,478
12 Months or Longer | 7,287 | 12,317
Total | 7,287 | 13,795
Collateralized mortgage obligations |  |
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (79)
12 Months or Longer | (33) | (2,293)
Total | (33) | (2,372)
Estimated Fair Value |  |
Less Than 12 Months | 0 | 9,232
12 Months or Longer | 2,965 | 99,390
Total | 2,965 | 108,622
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (28)
12 Months or Longer | 0 | 0
Total | 0 | (28)
Estimated Fair Value |  |
Less Than 12 Months | 13 | 2,171
12 Months or Longer | 0 | 0
Total | 13 | 2,171
Municipal securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (17)
12 Months or Longer | 0 | (243)
Total | 0 | (260)
Estimated Fair Value |  |
Less Than 12 Months | 0 | 2,219
12 Months or Longer | 0 | 7,407
Total | 0 | 9,626
Gross Unrealized Losses |  |
Less Than 12 Months | (6) | (512)
12 Months or Longer | (2) | (582)
Total | (8) | (1,094)
Estimated Fair Value |  |
Less Than 12 Months | 3,016 | 55,793
12 Months or Longer | 763 | 26,511
Total | $ 3,779 | $ 82,304

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