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RECENTLY ADOPTED AND ISSUED ACCOUNTING STANDARDS - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method $ 61,505 $ 61,505      
Off-Balance Sheet, Credit Loss, Liability, Change in Method, Credit Loss Expense (Reversal) 12,155 12,200      
Deferred tax liability, Credit Loss, Change in Method, Credit Loss Expense (Reversal) $ (16,778)        
Cumulative Effect, Period of Adoption, Adjustment          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     $ (56,882) $ 3,542 $ 0
Retained earnings | Cumulative Effect, Period of Adoption, Adjustment          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest   $ 56,900 $ (56,882) $ 2,636 $ 5,093