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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Cost Recovery Loans (Details)	3 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost	$ 404,074,000	$ 373,500,000
Financing receivable, allowance for credit loss	175,000,000		$ 175,000,000
Specific CECL allowance (reversal), net of previously recorded amount		125,000,000.0
Provision previously recorded due to payoff or restructuring		25,000,000.0
Total carrying value, net	6,820,074,000	6,430,618,000	$ 6,496,977,000
Specific CECL Allowance	0	(150,000,000)
Payment in kind interest	16,800,000	12,400,000
Minimum
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Rent, Price Per Square Foot	$ 45
Minimum | Hotel | Discount Rate
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input	0.085
Minimum | Hotel | Capitalization Rate
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input	0.070
Minimum | Urban Predevelopment | Capitalization Rate
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input	0.050
Maximum
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable, Rent, Price Per Square Foot	$ 215
Maximum | Urban Predevelopment | Capitalization Rate
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input	0.055
Retail Center - Cincinnati, OH
Financing Receivable, Credit Quality Indicator [Line Items]
Specific CECL Allowance	$ (67,000,000.0)
Payment in kind interest	$ 300,000	$ 600,000
Retail Center - Cincinnati, OH | Capitalization Rate
Financing Receivable, Credit Quality Indicator [Line Items]
Loan collateral, measurement input	0.083
Mortgage, Amortized cost
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost	$ 375,813,000
Mortgage, Amortized cost | Urban Predevelopment - Brooklyn, NY
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost	151,796,000
Mortgage, Amortized cost | Urban Predevelopment - Miami, FL
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost	118,136,000
Total carrying value, net	180,500,000
Mortgage, Amortized cost | Retail Center - Cincinnati, OH
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost	105,881,000
Mezzanine, Amortized cost
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost	28,261,000
Mezzanine, Amortized cost | Hotel - Washington D.C.
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost	$ 28,261,000

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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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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