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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)	9 Months Ended
	Sep. 30, 2025 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Mortgage servicing rights	$ 21,896,000	$ 19,449,000	$ 21,003,000	$ 0
Multi-family CDOs, at fair value	3,577,459,000		2,978,444,000
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	3,202,295,000		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	3,202,295,000		842,764,000
Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, at fair value	4,256,683,000
Level 3 | Equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity investments	28,825,000
Level 3 | MSRs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Mortgage servicing rights	21,896,000
Level 3 | IRLCs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative asset, estimated fair value	$ 2,383,000
Level 3 | Lifetime CDR | Valuation Technique, Discounted Cash Flow | Weighted Average | MSRs
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 | MSRs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Servicing asset, measurement input	0
Level 3 | Lifetime CDR | Valuation Technique, Discounted Cash Flow | Maximum | MSRs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Servicing asset, measurement input	0.418
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 | MSRs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Servicing asset, measurement input	0.122
Level 3 | Yield | Valuation Technique, Discounted Cash Flow | Minimum | MSRs
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 | MSRs
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	0.162
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)	5 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)	29 months
Level 3 | Lifetime voluntary prepayment rate | Valuation Technique, Discounted Cash Flow | Weighted Average | MSRs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Servicing asset, measurement input	0.103
Level 3 | Lifetime voluntary prepayment rate | Valuation Technique, Discounted Cash Flow | Minimum | MSRs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Servicing asset, measurement input	0.003
Level 3 | Lifetime voluntary prepayment rate | Valuation Technique, Discounted Cash Flow | Maximum | MSRs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Servicing asset, measurement input	0.275
Level 3 | Pull-through rate | Valuation Technique, Internal Valuation Model | Weighted Average | IRLCs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative asset, measurement Input	0.794
Level 3 | Pull-through rate | Valuation Technique, Internal Valuation Model | Minimum | IRLCs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative asset, measurement Input	0.788
Level 3 | Pull-through rate | Valuation Technique, Internal Valuation Model | Maximum | IRLCs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Derivative asset, measurement Input	0.817
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | Valuation Technique, Discounted Cash Flow
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, at fair value	$ 2,807,775,000
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | Valuation Technique, Liquidation Model
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, at fair value	106,622,000
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | Valuation Technique, Transaction Price
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, at fair value	$ 159,687,000
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | 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	0.096
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | 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, residential loans held in securitization trusts and residential loans held for sale | Lifetime CPR | Valuation Technique, Discounted Cash Flow | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.470
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | 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, residential loans held in securitization trusts and residential loans held for sale | 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, residential loans held in securitization trusts and residential loans held for sale | Lifetime CDR | Valuation Technique, Discounted Cash Flow | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.337
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | 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	0.132
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | Loss severity | Valuation Technique, Discounted Cash Flow | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.002
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | 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, residential loans held in securitization trusts and residential loans held for sale | Yield | Valuation Technique, Discounted Cash Flow | Weighted Average
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.067
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | Yield | Valuation Technique, Discounted Cash Flow | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.054
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | Yield | Valuation Technique, Discounted Cash Flow | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.459
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | Yield | Valuation Technique, Liquidation Model | Weighted Average
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.083
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | Yield | Valuation Technique, Liquidation Model | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.059
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | Yield | Valuation Technique, Liquidation Model | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	0.356
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | 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	0.002
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | 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	(0.015)
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | 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	0.071
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | 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	16
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | 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, residential loans held in securitization trusts and residential loans held for sale | Liquidation timeline (months) | Valuation Technique, Liquidation Model | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	54
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | Property value | Valuation Technique, Liquidation Model | Weighted Average
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	2,020,758
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | Property value | Valuation Technique, Liquidation Model | Minimum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	30,000
Level 3 | Residential loans, residential loans held in securitization trusts and residential loans held for sale | Property value | Valuation Technique, Liquidation Model | Maximum
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, measurement input	13,900,000
Level 3 | Multi-family loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans receivable, at fair value	$ 68,647,000
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	0.121
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)	22 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)	1 month
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)	45 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	$ 1,182,599,000
Variable interest entity, primary beneficiary, maximum loss exposure, amount	158,800,000		$ 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	$ 1,016,952,000
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	0.154
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	0.003
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	0.257
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	0.052
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	0.123
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	0.011
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	0.184

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