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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Statistics for Loan Portfolio (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan	67	72
Principal balance	$ 6,535,079	$ 6,375,093
Commercial mortgage loans, net	6,496,977	6,375,093
Unfunded loan commitments	$ 1,399,989	$ 1,952,887
Weighted-average cash coupon	5.70%	6.50%
Weighted-average remaining fully-extended term	2 years 9 months 18 days	3 years 3 months 18 days
Weighted-average expected term	2 years 1 month 6 days	1 year 9 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	$ 6,728,424	$ 6,467,842

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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 Interest Rate

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

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

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