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Participations Sold (Details) $ in Thousands, £ in Millions	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 GBP (£)	Oct. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)
Participating Mortgage Loans [Line Items]
Total carrying value, net	$ 6,820,074	$ 6,496,977			$ 6,430,618
Mezzanine, Amortized cost | Secured Debt
Participating Mortgage Loans [Line Items]
Total carrying value, net		97,100	£ 70.5	$ 88,500
Mezzanine, Amortized cost | Ground-up Condominium Development - New York
Participating Mortgage Loans [Line Items]
Debt instrument, face amount				$ 25,000
Mezzanine, Amortized cost | Office Building - London
Participating Mortgage Loans [Line Items]
Debt instrument, face amount		8,900	6.7
Remaining unfunded commitment		$ 25,300	£ 19.1

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- Definition

Debt Instrument, Remaining Unfunded Commitment

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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- Definition

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.

+ References

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))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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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.

+ References

No definition available.

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