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MARKETABLE SECURITIES - Securities in Continuous Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Gross Unrealized Losses |  |
Less Than 12 Months | $ (3,478) | $ (1,799)
12 Months or Longer | (4,508) | (1,747)
Total | (7,986) | (3,546)
Estimated Fair Value |  |
Less Than 12 Months | 127,003 | 144,484
12 Months or Longer | 106,348 | 76,601
Total | 233,351 | 221,085
Gross Unrealized Losses |  |
Less Than 12 Months | (1,145) | (94)
12 Months or Longer | (843) | (354)
Total | (1,988) | (448)
Estimated Fair Value |  |
Less Than 12 Months | 77,942 | 15,729
12 Months or Longer | 28,004 | 29,708
Total | 105,946 | 45,437
Corporate bonds |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (643) | (50)
12 Months or Longer | 0 | 0
Total | (643) | (50)
Estimated Fair Value |  |
Less Than 12 Months | 18,141 | 8,019
12 Months or Longer | 0 | 0
Total | 18,141 | 8,019
Municipal securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (17) | 0
12 Months or Longer | (288) | (200)
Total | (305) | (200)
Estimated Fair Value |  |
Less Than 12 Months | 807 | 0
12 Months or Longer | 7,410 | 7,546
Total | 8,217 | 7,546
Mortgage-backed securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (314) | (658)
12 Months or Longer | (3,506) | (1,135)
Total | (3,820) | (1,793)
Estimated Fair Value |  |
Less Than 12 Months | 16,151 | 42,881
12 Months or Longer | 75,091 | 47,797
Total | 91,242 | 90,678
Collateralized mortgage obligations |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (2,504) | (1,091)
12 Months or Longer | (714) | (412)
Total | (3,218) | (1,503)
Estimated Fair Value |  |
Less Than 12 Months | 91,904 | 93,584
12 Months or Longer | 23,847 | 21,258
Total | 115,751 | 114,842
Municipal securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (952) | (37)
12 Months or Longer | (529) | (181)
Total | (1,481) | (218)
Estimated Fair Value |  |
Less Than 12 Months | 68,662 | 9,230
12 Months or Longer | 19,466 | 19,961
Total | 88,128 | 29,191
Mortgage-backed securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (158) | (57)
12 Months or Longer | (314) | (173)
Total | (472) | (230)
Estimated Fair Value |  |
Less Than 12 Months | 6,686 | 6,499
12 Months or Longer | 8,538 | 9,747
Total | 15,224 | 16,246
Collateralized mortgage obligations |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (35) | 0
12 Months or Longer | 0 | 0
Total | (35) | 0
Estimated Fair Value |  |
Less Than 12 Months | 2,594 | 0
12 Months or Longer | 0 | 0
Total | $ 2,594 | $ 0

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