Loans Held for Investment, net - Loan Portfolio (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026 USD ($) loan	Dec. 31, 2025 USD ($) loan	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans \| loan	26	24
Amortized Cost \| $	$ 730,096	$ 685,707	$ 660,237	$ 609,916
Percentage of Value	100.00%	100.00%
South
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans \| loan	8	8
Amortized Cost \| $	$ 232,513	$ 222,512
Percentage of Value	32.00%	32.00%
East
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans \| loan	7	7
Amortized Cost \| $	$ 224,529	$ 223,240
Percentage of Value	31.00%	33.00%
West
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans \| loan	8	6
Amortized Cost \| $	$ 167,812	$ 134,741
Percentage of Value	23.00%	20.00%
Midwest
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans \| loan	3	3
Amortized Cost \| $	$ 105,242	$ 105,214
Percentage of Value	14.00%	15.00%
Office
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans \| loan	6	6
Amortized Cost \| $	$ 166,344	$ 165,745
Percentage of Value	23.00%	24.00%
Hotel
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans \| loan	4	4
Amortized Cost \| $	$ 122,996	$ 121,393
Percentage of Value	17.00%	18.00%
Student Housing
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans \| loan	4	4
Amortized Cost \| $	$ 116,680	$ 115,575
Percentage of Value	16.00%	17.00%
Industrial
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans \| loan	4	4
Amortized Cost \| $	$ 113,404	$ 112,792
Percentage of Value	15.00%	16.00%
Multifamily
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans \| loan	3	3
Amortized Cost \| $	$ 87,975	$ 87,920
Percentage of Value	12.00%	13.00%
Other
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans \| loan	3	1
Amortized Cost \| $	$ 74,524	$ 34,292
Percentage of Value	10.00%	5.00%
Self Storage
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans \| loan	2	2
Amortized Cost \| $	$ 48,173	$ 47,990
Percentage of Value	7.00%	7.00%