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FAIR VALUE DISCLOSURES - Reconciliation of Gains and Losses on Level 3 Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Fair Value Disclosures [Abstract]    
Beginning balance $ 12,798 $ 14,715
Accretion (amortization) 5 (557)
Increase (decrease) in fair value 0 33
Settlements (2,940) (4,328)
Ending balance $ 9,863 $ 9,863