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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended				12 Months Ended
	Mar. 31, 2025		Mar. 31, 2025		Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2024		Feb. 28, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans on real estate, commercial and consumer, percentage of portfolio			100.00%				100.00%
Interest receivable	$ 61,047		$ 61,047				$ 58,470
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]			Secured Overnight Financing Rate [Member]
Amortized cost of loans in cost recovery	499,900		$ 499,900				486,800
Interest received for loans in cost recovery			600			$ 600
Unfunded commitments	6,080		6,080				5,948
Mortgage loans on real estate, commercial and consumer, net	7,687,086		7,687,086				7,104,156
Note receivable, held for sale	41,200		41,200				41,200
Write-offs, specific CECL allowance, funded			0				127,512
Interest income from subordinate loans and other lending assets			557			849
Proceeds from pre-payment penalties or accelerated fees			0			100
Proceeds received from the repayment and sale of commercial mortgage loans			138,024			168,526
Valuation allowance, commercial mortgage loan held for sale			$ 0			$ (679)
Multifamily Property in Miami Gardens, Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans on real estate, commercial and consumer, net									$ 114,000
Office Property - New York City
Accounts, Notes, Loans and Financing Receivable [Line Items]
Floating rate					3.92%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]					Secured Overnight Financing Rate (SOFR) [Member]
Fixed rate					5.00%
Hotel - Honolulu, Hi
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan, mortgage, held-for-sale, price percentage			99.50%			99.50%
Massachusetts Healthcare
Accounts, Notes, Loans and Financing Receivable [Line Items]
Equity method interest in joint venture	23,000		$ 23,000				20,100
Past Due 90
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost of loans in cost recovery	499,900		499,900				486,800
Commercial Mortgage and Subordinated Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in current expected credit loss allowance, net			0			$ 142,000
Unfunded commitments	10,300		10,300				10,600
Mortgage loans on real estate, commercial and consumer, net	4,200		4,200				8,300
Write-offs, specific CECL allowance, funded			0
Subordinate Mortgage Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans on real estate, commercial and consumer, net	402,064	[1]	$ 402,064	[1]			$ 388,809	[1]	$ 24,000
Proceeds received from the repayment and sale of commercial mortgage loans	24,000
Floating Rate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans on real estate, commercial and consumer, percentage of portfolio			95.00%				95.00%
Senior and Junior Mezzanine Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans on real estate, commercial and consumer, percentage of portfolio			9.50%				10.10%
Modified receivables	$ 735,800		$ 735,800				$ 721,700
Junior Mezzanine A Loan | Commercial Mortgage and Subordinated Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Specific CECL allowance increased						142,000
Mortgage, Amortized cost | Hotel - Honolulu, Hi
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, gain (loss) on sales, net						$ 700
Senior Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from (repayments of) secured debt					$ 108,300
Cleveland Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Floating rate					3.25%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]					Secured Overnight Financing Rate (SOFR) [Member]
Fixed rate					6.00%
Debt instrument, extension term			2 years
[1] Net of $377,212 and $373,336 CECL Allowances comprised $34,712 and $30,836 General CECL Allowance in 2025 and 2024, respectively, and $342,500 Specific CECL Allowance in 2025 and 2024.

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