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MARKETABLE SECURITIES - Securities in Continuous Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Gross Unrealized Losses    
Less Than 12 Months $ (25) $ (638)
12 Months or Longer (2,487) (6,459)
Total (2,512) (7,097)
Estimated Fair Value    
Less Than 12 Months 2,920 29,860
12 Months or Longer 156,758 191,232
Total 159,678 221,092
Gross Unrealized Losses    
Less Than 12 Months (4) (561)
12 Months or Longer (574) (1,061)
Total (578) (1,622)
Estimated Fair Value    
Less Than 12 Months 1,550 59,442
12 Months or Longer 36,701 38,828
Total 38,251 98,270
Corporate bonds    
Gross Unrealized Losses    
Less Than 12 Months 0 (453)
12 Months or Longer (27) (336)
Total (27) (789)
Estimated Fair Value    
Less Than 12 Months 0 11,236
12 Months or Longer 5,013 7,718
Total 5,013 18,954
Mortgage-backed securities    
Gross Unrealized Losses    
Less Than 12 Months (24) (89)
12 Months or Longer (1,821) (3,587)
Total (1,845) (3,676)
Estimated Fair Value    
Less Than 12 Months 2,538 7,173
12 Months or Longer 72,062 76,717
Total 74,600 83,890
Gross Unrealized Losses    
Less Than 12 Months 0 (21)
12 Months or Longer (313) (479)
Total (313) (500)
Estimated Fair Value    
Less Than 12 Months 0 1,478
12 Months or Longer 12,062 12,317
Total 12,062 13,795
Collateralized mortgage obligations    
Gross Unrealized Losses    
Less Than 12 Months 0 (79)
12 Months or Longer (579) (2,293)
Total (579) (2,372)
Estimated Fair Value    
Less Than 12 Months 0 9,232
12 Months or Longer 72,116 99,390
Total 72,116 108,622
Gross Unrealized Losses    
Less Than 12 Months 0 (28)
12 Months or Longer (11) 0
Total (11) (28)
Estimated Fair Value    
Less Than 12 Months 0 2,171
12 Months or Longer 2,026 0
Total 2,026 2,171
Municipal securities    
Gross Unrealized Losses    
Less Than 12 Months (1) (17)
12 Months or Longer (60) (243)
Total (61) (260)
Estimated Fair Value    
Less Than 12 Months 382 2,219
12 Months or Longer 7,567 7,407
Total 7,949 9,626
Gross Unrealized Losses    
Less Than 12 Months (4) (512)
12 Months or Longer (250) (582)
Total (254) (1,094)
Estimated Fair Value    
Less Than 12 Months 1,550 55,793
12 Months or Longer 22,613 26,511
Total $ 24,163 $ 82,304