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FAIR VALUE DISCLOSURES - Reconciliation of Gains and Losses on Level 3 Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Fair Value Disclosures [Abstract]    
Beginning balance $ 40,575 $ 9,190
Accretion (amortization) (9) 16
Increase (decrease) in fair value 12 (30)
Settlements (900) 35,074
Ending balance $ 39,678 $ 44,250