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SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Allowance for loan loss   $ 27,900 $ 169,500
Accumulated deficit   9,653,582 10,667,388
Accounting Standards Update [Extensible Enumeration] Accounting Standards Update 2016-13 [Member]    
Cumulative effect of change in accounting principle for credit losses      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Allowance for loan loss $ 37,400    
Off-balance sheet credit loss, liability 2,200    
Accumulated deficit $ 39,600    
Interest rate swaps, at fair value      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Margin deposit assets   $ 1,200,000 $ 1,100,000