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Loans and Preferred Equity Held for Investment, net - Activity in Loans Held for Investment, Net (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2026 USD ($) property loan	Mar. 31, 2025 USD ($) loan	Dec. 31, 2025 USD ($) forwardSwap loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Beginning balance	$ 2,590,914	$ 2,352,993	$ 2,352,993
Acquisitions/originations/additional funding	270,378	112,625
Loan maturities/principal repayments	(169,887)	(133,000)
(Increase) decrease of CECL reserve	(554)	770
Discount accretion and fee amortization, net	(1,342)	461
Capitalized interest, net of repayments	447	523
Transfer to Real Estate, net	(45,200)	(32,945)
Charge-off of CECL reserve-transfer to Real Estate, net	0	1,043
Charge-off of loan held for investment	(2,639)	(9,174)
Charge-off of CECL reserve-other	2,639	9,174
Ending balance	$ 2,644,756	2,302,470	$ 2,590,914
Transfer of principal		8,800
Number of loans | loan	8
Total commitment	$ 280,100
Multifamily
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Number of legal titles acquired	1		1
Arlington, Texas
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Realized loss on securities from write-down to fair value	$ 3,500	$ 9,200
Reversal of charge offs	$ 800
Denver, Colorado
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Number of loans on nonaccrual status | loan			1
Denver, Colorado | Multifamily
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Number of loans on nonaccrual status | loan	1
Multifamily
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Number of loans on nonaccrual status | loan	1
Multifamily | Denver, Colorado
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Number of loans on nonaccrual status | loan	2	1
PD/LGD model
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward]
Provision for (reversal of) loan losses for unfunded commitments	$ 1,200	$ 500

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