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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($) securitization	Jun. 30, 2024 USD ($) jointVenture	Jun. 30, 2025 USD ($) securitization	Jun. 30, 2024 USD ($) jointVenture	Dec. 31, 2024 USD ($) securitization
Variable Interest Entity [Line Items]
Number of securitizations completed | securitization			2
Proceeds from securitizations of loans held-for-investment			$ 326,300,000
Gain (loss) on extinguishment of debt	$ 0	$ 0	$ 0	$ (692,000)
VIE, Primary Beneficiary | Multifamily
Variable Interest Entity [Line Items]
Number of equity investments sold | jointVenture		1		2
VIE, Primary Beneficiary | Consolidated SLST
Variable Interest Entity [Line Items]
Number of securitization trusts | securitization	3		3		2
VIE, Primary Beneficiary | Consolidated SLST | Level 3
Variable Interest Entity [Line Items]
Variable interest entity, primary beneficiary, maximum loss exposure, amount	$ 160,900,000		$ 160,900,000		$ 148,500,000
Residential loans held in securitization trusts
Variable Interest Entity [Line Items]
Number of securitizations optional redemption right exercised | securitization			1
Proceeds from residential loan securitization redemption (approximately)			$ 54,400,000
Gain (loss) on extinguishment of debt			$ 0

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The cash inflow from the securitization of loans held for investment. Securitization is the structured process whereby interests in loans and other receivables are packaged, underwritten, and sold in the form of asset-backed securities.

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