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Real Estate Owned - Brooklyn Multifamily Development - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2025		Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2025		Sep. 30, 2024	Feb. 28, 2025	Dec. 31, 2024		Dec. 31, 2022
Real Estate [Line Items]
Debt related to real estate owned, held for investment, net	$ 402,945				$ 402,945				$ 324,587
Commercial mortgage loans, net	8,303,645				8,303,645				7,104,156
Financing receivable, construction and finance costs capitalized	22,700		$ 44,000		$ 75,700		$ 121,400
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]				Secured Overnight Financing Rate [Member]	Secured Overnight Financing Rate [Member]
Debt instrument, covenant, unencumbered liquidity, threshold	100,000				$ 100,000
Debt instrument, covenant, net worth threshold	600,000				600,000
Aggregate Notional Amount (in thousands)				$ 73,700
Real estate owned, accumulated depreciation	31,035				31,035				23,266
Net loss	700		$ 1,900		6,900		$ 8,100
Interest rate caps | Not Designated as Hedging Instrument
Real Estate [Line Items]
Aggregate Notional Amount (in thousands)	238,535				238,535				238,535
Derivative Financial Instruments, Assets | Interest rate caps | Not Designated as Hedging Instrument
Real Estate [Line Items]
Aggregate Notional Amount (in thousands)	100				100				400
Letter of Credit
Real Estate [Line Items]
Maximum amount of borrowings	388,400				$ 388,400
Line of credit facility, option to extend, period					1 year
Mortgages
Real Estate [Line Items]
Debt related to real estate owned, held for investment, net	329,800				$ 329,800				252,000
Less: deferred financing costs	1,100				1,100				2,000
JV Partner
Real Estate [Line Items]
Financing receivable, loan in process											$ 164,800
JV Partner | Joint venture
Real Estate [Line Items]
Equity method investment, ownership percentage											100.00%
Subordinate Mortgage Portfolio Segment
Real Estate [Line Items]
Commercial mortgage loans, net	153,790	[1]			$ 153,790	[1]		$ 24,000	388,809	[1]
Multifamily Development - Brooklyn, NY
Real Estate [Line Items]
Interest rate for repurchase facility					2.55%
Net loss	(800)				$ (800)
Multifamily Development - Brooklyn, NY | Building
Real Estate [Line Items]
Real estate owned, held for investment, net	393,200				393,200
Real estate owned, accumulated depreciation	100				100
Multifamily Development - Brooklyn, NY | Furniture Fixtures and Equipment
Real Estate [Line Items]
Real estate owned, accumulated depreciation	2,100				2,100
Deed-In-Lieu Of Foreclosure
Real Estate [Line Items]
Commercial mortgage loans, net	616,600				616,600				540,900
Capitalized construction and financing costs	$ 393,300				$ 393,300				$ 319,700
[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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