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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Statistics for Loan Portfolio (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan	66	67
Principal balance	$ 7,289,988	$ 6,535,079
Commercial mortgage loans, net	7,257,304	6,496,977
Unfunded loan commitments	$ 1,182,992	$ 1,399,989
Weighted-average cash coupon	4.80%	5.70%
Weighted-average remaining fully-extended term	2 years 8 months 12 days	2 years 9 months 18 days
Weighted-average expected term	1 year 10 months 24 days	2 years 1 month 6 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	$ 7,455,237	$ 6,728,424

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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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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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Amount, before allowance for credit loss, of financing receivable.

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