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Fair Value of Financial Instruments - Schedule of Quantitative Information Regarding Significant and Unobservable Inputs Used in the Valuation of Level 3 Assets and Liabilities Measured at Fair Value (Details)	6 Months Ended
	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Mortgage servicing rights	$ 19,449,000	$ 20,297,000	$ 21,003,000	$ 0
90 Days or greater past due
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value	0		0
VIE, Primary Beneficiary
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Multi-family CDOs, at fair value	235,226,000			$ 275,200,000
Consolidated SLST
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Multi-family CDOs, at fair value	2,626,479,000		2,135,680,000
Consolidated SLST | VIE, Primary Beneficiary
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Multi-family CDOs, at fair value	2,626,479,000		842,764,000
Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, at fair value	4,026,027,000
Level 3 | Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Mortgage servicing rights	19,449,000
Level 3 | Valuation Technique, Discounted Cash Flow | Equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity investments	$ 54,324,000
Level 3 | Lifetime CDR | Valuation Technique, Discounted Cash Flow | Weighted Average | Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Servicing asset, measurement input	0.022
Level 3 | Lifetime CDR | Valuation Technique, Discounted Cash Flow | Minimum | Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Servicing asset, measurement input	0.002
Level 3 | Lifetime CDR | Valuation Technique, Discounted Cash Flow | Maximum | Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Servicing asset, measurement input	0.426
Level 3 | Loss severity | Valuation Technique, Discounted Cash Flow | Weighted Average | Equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity method investment, measurement input	0
Level 3 | Yield | Valuation Technique, Discounted Cash Flow | Weighted Average | Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Servicing asset, measurement input	0.123
Level 3 | Yield | Valuation Technique, Discounted Cash Flow | Minimum | Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Servicing asset, measurement input	0.120
Level 3 | Yield | Valuation Technique, Discounted Cash Flow | Maximum | Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Servicing asset, measurement input	0.140
Level 3 | Discount rate | Valuation Technique, Discounted Cash Flow | Weighted Average | Equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity method investment, measurement input	0.160
Level 3 | Discount rate | Valuation Technique, Discounted Cash Flow | Minimum | Equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity method investment, measurement input	0.150
Level 3 | Discount rate | Valuation Technique, Discounted Cash Flow | Maximum | Equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity method investment, measurement input	0.175
Level 3 | Months to assumed redemption | Valuation Technique, Discounted Cash Flow | Weighted Average | Equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial instruments owned, assumed redemption period (in months)	16 months
Level 3 | Months to assumed redemption | Valuation Technique, Discounted Cash Flow | Minimum | Equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial instruments owned, assumed redemption period (in months)	2 months
Level 3 | Months to assumed redemption | Valuation Technique, Discounted Cash Flow | Maximum | Equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial instruments owned, assumed redemption period (in months)	45 months
Level 3 | Lifetime voluntary prepayment rate | Valuation Technique, Discounted Cash Flow | Weighted Average | Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Servicing asset, measurement input	0.102
Level 3 | Lifetime voluntary prepayment rate | Valuation Technique, Discounted Cash Flow | Minimum | Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Servicing asset, measurement input	0.004
Level 3 | Lifetime voluntary prepayment rate | Valuation Technique, Discounted Cash Flow | Maximum | Mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Servicing asset, measurement input	0.274
Level 3 | Residential loans and residential loans held in securitization trusts | Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, at fair value	$ 2,663,801,000
Level 3 | Residential loans and residential loans held in securitization trusts | Valuation Technique, Liquidation Model
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, at fair value	$ 162,843,000
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CPR | Valuation Technique, Discounted Cash Flow | Weighted Average
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.093
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CPR | Valuation Technique, Discounted Cash Flow | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CPR | Valuation Technique, Discounted Cash Flow | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.455
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CDR | Valuation Technique, Discounted Cash Flow | Weighted Average
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.006
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CDR | Valuation Technique, Discounted Cash Flow | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CDR | Valuation Technique, Discounted Cash Flow | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.227
Level 3 | Residential loans and residential loans held in securitization trusts | Loss severity | Valuation Technique, Discounted Cash Flow | Weighted Average
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.137
Level 3 | Residential loans and residential loans held in securitization trusts | Loss severity | Valuation Technique, Discounted Cash Flow | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0
Level 3 | Residential loans and residential loans held in securitization trusts | Loss severity | Valuation Technique, Discounted Cash Flow | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	1.000
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Valuation Technique, Discounted Cash Flow | Weighted Average
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.071
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Valuation Technique, Discounted Cash Flow | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.043
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Valuation Technique, Discounted Cash Flow | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.483
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Valuation Technique, Liquidation Model | Weighted Average
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.075
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Valuation Technique, Liquidation Model | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.062
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Valuation Technique, Liquidation Model | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.152
Level 3 | Residential loans and residential loans held in securitization trusts | Annual home price appreciation/(depreciation) | Valuation Technique, Liquidation Model | Weighted Average
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.004
Level 3 | Residential loans and residential loans held in securitization trusts | Annual home price appreciation/(depreciation) | Valuation Technique, Liquidation Model | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0
Level 3 | Residential loans and residential loans held in securitization trusts | Annual home price appreciation/(depreciation) | Valuation Technique, Liquidation Model | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.061
Level 3 | Residential loans and residential loans held in securitization trusts | Liquidation timeline (months) | Valuation Technique, Liquidation Model | Weighted Average
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	17
Level 3 | Residential loans and residential loans held in securitization trusts | Liquidation timeline (months) | Valuation Technique, Liquidation Model | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0
Level 3 | Residential loans and residential loans held in securitization trusts | Liquidation timeline (months) | Valuation Technique, Liquidation Model | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	50
Level 3 | Residential loans and residential loans held in securitization trusts | Property value | Valuation Technique, Liquidation Model | Weighted Average
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	1,852,687
Level 3 | Residential loans and residential loans held in securitization trusts | Property value | Valuation Technique, Liquidation Model | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	6,000
Level 3 | Residential loans and residential loans held in securitization trusts | Property value | Valuation Technique, Liquidation Model | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	12,750,000
Level 3 | Multi-family loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, at fair value	$ 74,999,000
Level 3 | Multi-family loans | Loss severity | Valuation Technique, Discounted Cash Flow | Weighted Average
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial instruments owned, measurement input	0
Level 3 | Multi-family loans | Discount rate | Valuation Technique, Discounted Cash Flow | Weighted Average
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial instruments owned, measurement input	0.122
Level 3 | Multi-family loans | Discount rate | Valuation Technique, Discounted Cash Flow | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial instruments owned, measurement input	0.110
Level 3 | Multi-family loans | Discount rate | Valuation Technique, Discounted Cash Flow | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial instruments owned, measurement input	0.135
Level 3 | Multi-family loans | Months to assumed redemption | Valuation Technique, Discounted Cash Flow | Weighted Average
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial instruments owned, assumed redemption period (in months)	26 months
Level 3 | Multi-family loans | Months to assumed redemption | Valuation Technique, Discounted Cash Flow | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial instruments owned, assumed redemption period (in months)	2 months
Level 3 | Multi-family loans | Months to assumed redemption | Valuation Technique, Discounted Cash Flow | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial instruments owned, assumed redemption period (in months)	46 months
Level 3 | Consolidated SLST | VIE, Primary Beneficiary
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, at fair value	$ 1,199,383,000
Variable interest entity, primary beneficiary, maximum loss exposure, amount	160,900,000		$ 148,500,000
Level 3 | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Multi-family CDOs, at fair value	$ 1,031,897,000
Level 3 | Consolidated SLST | Loss severity | Valuation Technique, Discounted Cash Flow | Weighted Average | Consolidated SLST | VIE, Primary Beneficiary
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt, measurement input	0.150
Level 3 | Consolidated SLST | Loss severity | Valuation Technique, Discounted Cash Flow | Minimum | Consolidated SLST | VIE, Primary Beneficiary
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt, measurement input	0.002
Level 3 | Consolidated SLST | Loss severity | Valuation Technique, Discounted Cash Flow | Maximum | Consolidated SLST | VIE, Primary Beneficiary
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt, measurement input	0.891
Level 3 | Consolidated SLST | Yield | Valuation Technique, Discounted Cash Flow | Weighted Average | Consolidated SLST | VIE, Primary Beneficiary
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt, measurement input	0.053
Level 3 | Consolidated SLST | Yield | Valuation Technique, Discounted Cash Flow | Minimum | Consolidated SLST | VIE, Primary Beneficiary
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt, measurement input	0.044
Level 3 | Consolidated SLST | Yield | Valuation Technique, Discounted Cash Flow | Maximum | Consolidated SLST | VIE, Primary Beneficiary
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt, measurement input	0.128
Level 3 | Consolidated SLST | Collateral prepayment rate | Valuation Technique, Discounted Cash Flow | Weighted Average | Consolidated SLST | VIE, Primary Beneficiary
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt, measurement input	0.061
Level 3 | Consolidated SLST | Collateral prepayment rate | Valuation Technique, Discounted Cash Flow | Minimum | Consolidated SLST | VIE, Primary Beneficiary
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt, measurement input	0.027
Level 3 | Consolidated SLST | Collateral prepayment rate | Valuation Technique, Discounted Cash Flow | Maximum | Consolidated SLST | VIE, Primary Beneficiary
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt, measurement input	0.073
Level 3 | Consolidated SLST | Collateral default rate | Valuation Technique, Discounted Cash Flow | Weighted Average | Consolidated SLST | VIE, Primary Beneficiary
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt, measurement input	0.010
Level 3 | Consolidated SLST | Collateral default rate | Valuation Technique, Discounted Cash Flow | Minimum | Consolidated SLST | VIE, Primary Beneficiary
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt, measurement input	0
Level 3 | Consolidated SLST | Collateral default rate | Valuation Technique, Discounted Cash Flow | Maximum | Consolidated SLST | VIE, Primary Beneficiary
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt, measurement input	0.076

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