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FAIR VALUE DISCLOSURES - Reconciliation of Gains and Losses on Level 3 Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value Disclosures [Abstract]    
Beginning balance $ 9,190 $ 14,715
Accretion (amortization) 1 (552)
Increase (decrease) fair value (17) 30
Settlements 31,401 (5,003)
Ending balance $ 40,575 $ 9,190