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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - CECL Allowance as Percentage of Amortized Cost and Total Commitment (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Allowance and Provision for Loan Credit Loss [Abstract]
Beginning balance, specific CECL allowance, funded		$ 175,000
Quarter allowances (reversals), specific CECL allowance, funded	[1]	(1,238)	$ 183,465
Ending balance, specific CECL allowance, funded		175,000
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward]
Beginning balance, General CECL allowance, funded		38,102	0
Quarter allowances (reversals), General CECL allowance, funded		(1,667)	30,494
Ending balance, General CECL allowance, funded		36,435	58,273
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]
Beginning balance, General CECL allowance, unfunded		3,365	0
Quarter allowances (reversals), General CECL allowance, unfunded		429	2,971
Ending balance, General CECL allowance, unfunded		3,794	6,059
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]
General CECL Allowance		41,467	0
Total quarter allowances (reversals), General CECL allowance		(1,238)	33,465
General CECL Allowance		40,229	64,332
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]
Total CECL Allowance		216,467	56,981
Total CECL Allowance, Quarter allowances (reversals)		(1,238)	183,465
Total CECL Allowance		$ 215,229	$ 271,313
General CECL allowance, % of amortized cost		0.62%	1.08%	0.67%	0.00%
Total CECL allowance, % of amortized cost		3.06%	4.05%	3.23%	0.00%
Adjustment due to Adoption of ASU
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward]
Ending balance, General CECL allowance, funded			$ 27,779
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]
Ending balance, General CECL allowance, unfunded			3,088
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]
General CECL Allowance			30,867
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]
Total CECL Allowance			30,867
Commercial Mortgage and Subordinated Portfolio Segment
Allowance and Provision for Loan Credit Loss [Abstract]
Beginning balance, specific CECL allowance, funded		$ 175,000	56,981
Quarter allowances (reversals), specific CECL allowance, funded			150,000
Ending balance, specific CECL allowance, funded		$ 175,000	206,981
Commercial Mortgage and Subordinated Portfolio Segment | Adjustment due to Adoption of ASU
Allowance and Provision for Loan Credit Loss [Abstract]
Ending balance, specific CECL allowance, funded			$ 0
[1] Comprised of $0 and $150,000 Specific CECL Allowance and $(1,238) and $33,465 of General CECL (Reversals) and Allowance for 2021 and 2020, respectively.

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Allowance For Loan And Lease Losses, Including Loan Specific, Real Estate And Off-Balance Sheet, Credit Loss, Expense (Reversal)

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Allowance For Loan And Lease Losses, Including Loan Specific, Real Estate And Off-Balance Sheet, Credit Loss, Liability, Percent Of Amortized Cost

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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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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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Amount of credit loss expense (reversal of expense) for financing receivable.

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