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SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Mar. 31, 2021 | Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Allowance for loan loss |  | $ 33,400 | $ 169,500 |
Accumulated deficit |  | $ 9,251,804 | 10,667,388 | [1]
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Allowance for loan loss |  |  | 37,400 |
Off-balance sheet credit loss, liability |  |  | 2,200 |
Accumulated deficit |  |  | $ 39,600 |
[1] | Derived from the audited consolidated financial statements at December 31, 2020.

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