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FAIR VALUE DISCLOSURES - Reconciliation of Gains and Losses on Level 3 Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Fair Value Disclosures [Abstract]        
Beginning balance $ 39,678 $ 44,250 $ 40,575 $ 9,190
Accretion (amortization) (8) 3 (17) 19
Increase (decrease) in fair value 10 (8) 22 (38)
Settlements (650) (2,668) (1,550) 32,406
Ending balance $ 39,030 $ 41,577 $ 39,030 $ 41,577