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Real Estate Securities - Additional Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) Investment	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) Investment	Sep. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($) Investment
Debt and Equity Securities, FV-NI [Line Items]
Net unrealized gain (loss) on available-for-sale securities	$ 7,373,000	$ (3,921,000)	$ 17,083,000	$ 398,000
Number of AFS securities (in investments) | Investment	88		88			66
Number of securities in unrealized loss position | Investment	14		14			21
Number of securities in a continuous unrealized loss position for twelve consecutive months or longer (in investments) | Investment	11		11			19
Allowance for credit loss	$ 867,000		$ 867,000		$ 1,339,000	$ 2,482,000
Sales
Debt and Equity Securities, FV-NI [Line Items]
Gross realized gains			0	$ 2,000,000
Residential
Debt and Equity Securities, FV-NI [Line Items]
AFS securities, contractual maturities, less than five years	46,000,000		46,000,000
Marketable securities, due from five to ten years	$ 5,000,000		$ 5,000,000

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