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DERIVATIVE INSTRUMENTS - Offsetting assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Derivative assets    
Gross amounts $ 7,673 $ 11,967
Gross amounts offset (4,499) (3,730)
Net Amounts 3,174 8,237
Derivative liabilities    
Gross amounts 18,136 18,252
Gross amounts offset (4,499) (3,730)
Net Amounts $ 13,637 $ 14,522