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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Debit face amount $ 670,000,000.0  
Cash collateral held by counterparties subject to master netting agreements $ 39,300,000 $ 10,100,000
Cash collateral receivable that was not offset against derivative liabilities   $ 883,000