Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Unamortized discounts, fees, and costs	$ (14,626)	$ (222)
Reserve for loan losses	(14,134)	(10,280)	$ 0
Loans receivable, net	740,142	195,375
Remaining loans receivable commitments	100,000	11,000
Secured mortgage loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, gross	724,389	161,530
Mezzanine and other
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, gross	$ 44,513	$ 44,347

Financing Receivable, Remaining Commitments

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of unamortized loan commitment, origination, and other fees (costs) and purchase premium (discount) on financing receivable. Excludes financing receivable covered under loss sharing agreement.

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Amount, before allowance for credit loss, of financing receivable.

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