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Loans and Preferred Equity Held for Investment, net - Nonaccrual and Past Due Loans (Details) $ in Thousands	Mar. 31, 2026 USD ($) loan	Dec. 31, 2025 USD ($) loan
Financing Receivable, Past Due [Line Items]
Carrying Value	$ 2,730,072	$ 2,678,315
Denver, Colorado
Financing Receivable, Past Due [Line Items]
Number of loans on nonaccrual status | loan		1
Loan carrying value, nonaccrual	$ 31,500	$ 22,000
Denver, Colorado | Multifamily
Financing Receivable, Past Due [Line Items]
Number of loans on nonaccrual status | loan	1
Denver, Colorado | Office
Financing Receivable, Past Due [Line Items]
Number of loans on nonaccrual status | loan	1
Baltimore, Maryland
Financing Receivable, Past Due [Line Items]
Number of loans on nonaccrual status | loan	1	1
Loan carrying value, nonaccrual	$ 14,900	$ 14,700
Commercial mortgage
Financing Receivable, Past Due [Line Items]
Carrying Value	2,730,072	2,678,315
Commercial mortgage | Current or Less Than 30 Days Past Due
Financing Receivable, Past Due [Line Items]
Carrying Value	2,683,647	2,641,623
Commercial mortgage | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Carrying Value	0	0
Commercial mortgage | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Carrying Value	0	0
Commercial mortgage | 90 Days or More Past Due
Financing Receivable, Past Due [Line Items]
Carrying Value	$ 46,425	$ 36,692

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