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DERIVATIVE FINANCIAL INSTRUMENTS - Interest rate contracts not designated as hedging instruments (Details) - Not designated - Interest rate swap - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
DERIVATIVE FINANCIAL INSTRUMENTS |  |  |
Gross gains | $ 13,537 | $ 1,758 | $ 1,468
Gross losses | (13,500) | $ (1,758) | $ (1,468)
Net gains (losses) | $ 37 |  |

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