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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Statistics for Loan Portfolio (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023 USD ($) loan	Dec. 31, 2022 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan	55	61
Principal balance	$ 8,502,335	$ 8,708,214
Carrying value, net	8,472,068	8,681,990
Unfunded loan commitments	$ 872,707	$ 1,041,654
Weighted-average cash coupon	7.90%	7.20%
Weighted-average remaining fully-extended term	2 years 9 months 18 days	2 years 9 months 18 days
Weighted-average expected term	2 years 1 month 6 days	1 year 8 months 12 days
Interest rate used in calculating weighted-average cash coupon for non-accrual or cost recovery loans	0.00%	0.00%
Principal balance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Principal balance	$ 8,680,994	$ 8,892,767

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- Definition

Financing Receivable, Nonaccrual Or Cost Recovery Loans, Weighted Average Interest Rate

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Loans And Leases Receivable, Number Of Contracts

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Loans And Leases, Receivable Weighted Average Expected Maturity

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Loans And Leases Receivable, Weighted Average Interest Rate

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- Definition

Mortgage Loans on Real Estate, Commitment to Lend, Unfunded Amount

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- Definition

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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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 3B
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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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 https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

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