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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, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan	67	67
Principal balance	$ 8,371,419	$ 7,890,848
Commercial mortgage loans, net	8,350,042	7,857,260
Unfunded loan commitments	$ 1,800,235	$ 1,357,122
Weighted-average cash coupon	4.50%	4.50%
Weighted-average remaining fully-extended term	3 years	2 years 10 months 24 days
Weighted-average expected term	2 years	2 years 3 months 18 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	$ 8,594,654	$ 8,072,377

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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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