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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