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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Statistics for Loan Portfolio (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) loan	Mar. 31, 2020 USD ($) loan	Dec. 31, 2020 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan	67	75	67
Principal balance	$ 6,856,509	$ 6,488,891	$ 6,535,079
Commercial mortgage loans, net	6,820,074	$ 6,430,618	6,496,977
Unfunded loan commitments	$ 1,402,474		$ 1,399,989
Weighted-average cash coupon	5.60%		5.70%
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		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	$ 7,051,148		$ 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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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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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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