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MARKETABLE SECURITIES - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Gross Unrealized Losses |  |
Less Than 12 Months | $ (143) | $ (33)
12 Months or Longer | (3) | (327)
Total | (146) | (360)
Estimated Fair Value |  |
Less Than 12 Months | 12,600 | 20,559
12 Months or Longer | 1,070 | 44,710
Total | 13,670 | 65,269
Gross Unrealized Losses |  |
Less Than 12 Months |  | (1)
12 Months or Longer |  | (15)
Total |  | (16)
Estimated Fair Value |  |
Less Than 12 Months |  | 1,313
12 Months or Longer |  | 7,791
Total |  | 9,104
Municipal securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months |  | (8)
Total |  | (8)
Estimated Fair Value |  |
Less Than 12 Months |  | 1,138
Total |  | 1,138
Gross Unrealized Losses |  |
Less Than 12 Months |  | (1)
12 Months or Longer |  | (2)
Total |  | (3)
Estimated Fair Value |  |
Less Than 12 Months |  | 1,313
12 Months or Longer |  | 759
Total |  | 2,072
Mortgage-backed securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (143) | (25)
12 Months or Longer | 0 | (310)
Total | (143) | (335)
Estimated Fair Value |  |
Less Than 12 Months | 12,600 | 19,421
12 Months or Longer | 0 | 42,116
Total | 12,600 | 61,537
Gross Unrealized Losses |  |
Less Than 12 Months |  | 0
12 Months or Longer |  | (13)
Total |  | (13)
Estimated Fair Value |  |
Less Than 12 Months |  | 0
12 Months or Longer |  | 7,032
Total |  | 7,032
Collateralized mortgage obligations |  |
Gross Unrealized Losses |  |
Less Than 12 Months | 0 |
12 Months or Longer | (3) | (17)
Total | (3) | (17)
Estimated Fair Value |  |
Less Than 12 Months | 0 |
12 Months or Longer | 1,070 | 2,594
Total | $ 1,070 | $ 2,594

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