Loans Receivable - Schedule of Reserve for Loan Losses (Details) $ in Thousands	9 Months Ended
Sep. 30, 2020 USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Reserve for loan losses, December 31, 2019	$ 0
Cumulative-effect of adopting of ASU 2016-13 to beginning retained earnings	1,420
Provision for expected loan losses	10,127
Reserve for loan losses, September 30, 2020	11,547
Secured Mortgage Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Reserve for loan losses, December 31, 2019	0
Cumulative-effect of adopting of ASU 2016-13 to beginning retained earnings	513
Provision for expected loan losses	1,851
Reserve for loan losses, September 30, 2020	2,364
Mezzanine and Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Reserve for loan losses, December 31, 2019	0
Cumulative-effect of adopting of ASU 2016-13 to beginning retained earnings	907
Provision for expected loan losses	8,276
Reserve for loan losses, September 30, 2020	$ 9,183

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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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.

+ References

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- Definition

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

+ References

No definition available.

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- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

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