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Derivative Instruments and Hedging Activities (Details 2) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES [Abstract]    
Derivative Assets, Fair Value, Gross Assets $ 61,649 $ 44,637
Gross Amount of Eligible Offsetting Recognized Derivative Liabilities 0 0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 61,649 44,637
Derivative Asset, Not Offset, Policy Election Deduction (39,867) (25,187)
Cash Collateral Received (4,631) (9,918)
Derivative Asset, Fair Value, Amount Offset Against Collateral 17,151 9,532
Derivative Liability, Fair Value, Gross Liability (50,973) (36,102)
Gross Amount of Eligible Offsetting Recognized Derivative Assets 0 0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral (50,973) (36,102)
Derivative Liability, Not Offset, Policy Election Deduction 39,867 25,187
Cash Collateral Paid 1,671 2,048
Derivative Liability, Fair Value, Amount Offset Against Collateral $ (9,435) $ (8,867)