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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