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Assets and Liabilities Related to Real Estate Owned, Held for Sale - Narrative (Details) - USD ($) $ in Thousands				1 Months Ended	3 Months Ended
		Jun. 29, 2021	May 24, 2021	Dec. 31, 2020	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2017	Jun. 30, 2015
Debt Securities, Available-for-sale [Line Items]
Real estate held-for-sale, impairment							$ 600
Total carrying value, net					$ 8,350,042				$ 7,857,260
Specific CECL (allowance) reversal			$ 10,000		30,000		$ 0
Senior Mezzanine Loans
Debt Securities, Available-for-sale [Line Items]
Total carrying value, net					242,600
Mezzanine Loans
Debt Securities, Available-for-sale [Line Items]
Total carrying value, net					474,900
Subordinate Mortgage Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Total carrying value, net	[1]				763,488				844,948
Subordinate Mortgage Portfolio Segment | Mezzanine Loans
Debt Securities, Available-for-sale [Line Items]
Specific CECL (allowance) reversal								$ 10,000
Commercial Mortgage and Subordinated Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Total carrying value, net					85,500				$ 97,800
Specific CECL (allowance) reversal					$ (30,000)
Realized loss on investments						$ 20,000
Hotel - Anaheim, CA | Subordinate Mortgage Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Debt related to real estate owned, held for sale										$ 33,000
Specific CECL allowance (reversal), net of previously recorded amount				$ (2,400)
Hotel - Washington D.C.
Debt Securities, Available-for-sale [Line Items]
Specific CECL (allowance) reversal						$ 10,000
Hotel - Washington D.C. | Junior Mezzanine Loans
Debt Securities, Available-for-sale [Line Items]
Total carrying value, net										$ 20,000	$ 20,000
Hotel - Washington D.C. | Senior Mezzanine Loans
Debt Securities, Available-for-sale [Line Items]
Total carrying value, net											24,500
Payments to acquire mortgage notes receivable			24,500
Hotel - Washington D.C. | Subordinate Mortgage Portfolio Segment
Debt Securities, Available-for-sale [Line Items]
Debt related to real estate owned, held for investment			$ 110,000								$ 110,000
Payments for mortgage loans		$ 110,000
[1] Net of $196,377 and $178,588 CECL Allowances in 2022 and 2021, respectively, comprised of $175,000 and $145,000 Specific CECL Allowance and $21,377 and $33,588 General CECL Allowance, respectively.

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Debt Related To Real Estate Owned, Held For Sale

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Real Estate Held-For-Sale, Impairment

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Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
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The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(c))
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The cash outflow from the purchase of receivables arising from the mortgage note on real estate.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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