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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					6 Months Ended	9 Months Ended			12 Months Ended
	Mar. 31, 2025	Sep. 30, 2025		Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2024	Sep. 30, 2025		Sep. 30, 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		$ 65,482						$ 65,482			$ 58,470
Amortized cost of loans in cost recovery		375,000						375,000			486,800
Interest received for loans in cost recovery		200		$ 7,000				1,200		$ 8,300
Unfunded commitments		5,782						5,782			5,948
Commercial mortgage loans, net		8,303,645						8,303,645			7,104,156
Note receivable, held for sale		0						0			41,200
Proceeds from pre-payment penalties or accelerated fees		1,400		4,200				1,900		5,100
Payment in kind interest		5,100		0				5,500		0
Proceeds received from the repayment and sale of commercial mortgage loans								1,939,560		$ 1,580,003
Multifamily Property in Miami Gardens, Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial mortgage loans, net													$ 114,000
Hotel - Honolulu, Hi
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan, mortgage, held-for-sale, price percentage					99.50%
Past Due 90
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amortized cost of loans in cost recovery		375,000						$ 375,000			486,800
Commercial Mortgage and Subordinated Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans on real estate, commercial and consumer, percentage of portfolio								5.30%
Unfunded commitments		104,000						$ 104,000			5,100
Commercial mortgage loans, net		61,200						61,200			8,300
Modified receivables		438,900						438,900			378,300
Specific CECL Allowance		6,200		127,500	$ 7,500
Realized loss on investments		6,200		$ 127,500
Commercial Mortgage and Subordinated Portfolio Segment | Michigan Office
Accounts, Notes, Loans and Financing Receivable [Line Items]
Specific CECL Allowance					7,500
Realized loss on investments		6,200						6,200
Discounted payoff and received proceeds		1,300
Subordinate Mortgage Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial mortgage loans, net		153,790	[1]					153,790	[1]		$ 388,809	[1]	$ 24,000
Proceeds received from the repayment and sale of commercial mortgage loans	$ 24,000
Commercial Mortgage Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commitment of loan to finance future leasing costs		$ 77,400						$ 77,400
Modified include PIK Interest accruing fixed rate of interest not received in cash percentage		10.00%
Floating Rate Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans on real estate, commercial and consumer, percentage of portfolio								98.00%			95.00%
Junior Mezzanine A Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Specific CECL Allowance						$ 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)		$ (700)
[1] Net of $374,257 and $373,336 CECL Allowances comprised $39,257 and $30,836 General CECL Allowance in 2025 and 2024, respectively, and $335,000 and $342,500 Specific CECL Allowance in 2025 and 2024, respectively.

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