Loans Receivable - Schedule of Reserve for Loan Losses (Details) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2021 USD ($) property	Dec. 31, 2020 USD ($)
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
Expected loan losses related to loans sold and repaid	(9,658)	(8,394)
Expected loan losses related to loans transferred to held for sale	(498)	0
Provision for expected loan losses	2,603	17,254
Reserve for loan losses, end of period	$ 2,727	10,280
Number of loans held for sale \| property	1
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
Expected loan losses related to loans sold and repaid	(1,643)	(259)
Expected loan losses related to loans transferred to held for sale	(498)	0
Provision for expected loan losses	1,702	2,898
Reserve for loan losses, end of period	2,713	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
Expected loan losses related to loans sold and repaid	(8,015)	(8,135)
Expected loan losses related to loans transferred to held for sale	0	0
Provision for expected loan losses	901	14,356
Reserve for loan losses, end of period	$ 14	$ 7,128

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- Definition

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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Amount of decrease from sale and reclassification to held-for-sale of financing receivable.

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Amount of expense reversal of allowance for credit loss on financing receivable transferred to held-for-sale classification.

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

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