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Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Unamortized discounts, fees, and costs | $ (5,215) | $ (222) |
Reserve for loan losses | (2,727) | (10,280) | $ 0
Loans receivable, net | 411,062 | 195,375 |
Remaining loans receivable commitments | 59,000 | 11,000 |
Secured loans |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing receivable, gross | 395,303 | 161,530 |
Mezzanine and other |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing receivable, gross | $ 23,701 | $ 44,347 |

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