Loans Receivable - Schedule of Reserve for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Reserve for loan losses, beginning of period	$ 10,280	$ 0
Cumulative-effect of adopting of ASU 2016-13 to beginning retained earnings	0	1,420
Provision for expected loan losses	3,854	8,860
Reserve for loan losses, end of period	14,134	10,280
Secured Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Reserve for loan losses, beginning of period	3,152	0
Cumulative-effect of adopting of ASU 2016-13 to beginning retained earnings	0	513
Provision for expected loan losses	2,740	2,639
Reserve for loan losses, end of period	5,892	3,152
Mezzanine and Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Reserve for loan losses, beginning of period	7,128	0
Cumulative-effect of adopting of ASU 2016-13 to beginning retained earnings	0	907
Provision for expected loan losses	1,114	6,221
Reserve for loan losses, end of period	$ 8,242	$ 7,128

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

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- Definition

The effect of a change in method or methods for calculating the allowance for credit losses on the current period provision.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of credit loss expense (reversal of expense) for financing receivable.

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