Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) securitization jointVenture	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) securitization jointVenture	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) securitization
Variable Interest Entity [Line Items]
Proceeds from securitizations of loans held-for-investment			$ 974,300
Number of securitizations completed | securitization			4
Number of securitizations optional redemption right exercised | securitization			2
Loss on extinguishment of collateralized debt obligations and mortgages payable on real estate	$ 1,699	$ 0	$ 2,391	$ 693
VIE, Primary Beneficiary | Multifamily
Variable Interest Entity [Line Items]
Loss on extinguishment of collateralized debt obligations and mortgages payable on real estate	$ 100
Number of equity investments sold | jointVenture	4		6
VIE, Primary Beneficiary | Consolidated SLST
Variable Interest Entity [Line Items]
Proceeds from securitizations of loans held-for-investment			$ 73,000
Number of securitization trusts | securitization	2		2		1
Variable interest entity, primary beneficiary, maximum loss exposure, amount	$ 157,500		$ 157,500		$ 157,200
Residential loans held in securitization trusts
Variable Interest Entity [Line Items]
Proceeds from residential loan securitization redemption			193,300
Loss on extinguishment of collateralized debt obligations and mortgages payable on real estate			$ 700