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Fair Value of Financial Instruments - Schedule of Significant Unobservable Outputs (Details)	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	$ 21,003,000	$ 0	$ 0
Greater than 90 days past due
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	4,753,000
Consolidated SLST
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value	2,135,680,000	593,737,000
VIE, Primary Beneficiary
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value	275,200,000
VIE, Primary Beneficiary | Consolidated SLST
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value	2,135,680,000	593,737,000
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, at fair value	3,841,738,000
Mortgage servicing rights	616,000	0	$ 0
Level 3 | Equity investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	74,774,000
Level 3 | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights	21,003,000
Level 3 | VIE, Primary Beneficiary | Consolidated SLST
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, at fair value	965,672,000
Variable interest entity, primary beneficiary, maximum loss exposure, amount	148,500,000	$ 157,200,000
Level 3 | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value	$ 811,591,000
Level 3 | Weighted Average | Lifetime CDR | Valuation Technique, Discounted Cash Flow | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	0.022
Level 3 | Weighted Average | Loss severity | Valuation Technique, Discounted Cash Flow | Equity investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity method investment, measurement input	0.00%
Level 3 | Weighted Average | Loss severity | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, measurement input	0.203
Level 3 | Weighted Average | Yield | Valuation Technique, Discounted Cash Flow | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	0.122
Level 3 | Weighted Average | Yield | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, measurement input	0.058
Level 3 | Weighted Average | Discount rate | Valuation Technique, Discounted Cash Flow | Equity investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity method investment, measurement input	15.30%
Level 3 | Weighted Average | Months to assumed redemption | Valuation Technique, Discounted Cash Flow | Equity investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned, assumed redemption period (in months)	15 months
Level 3 | Weighted Average | Lifetime voluntary prepayment rate | Valuation Technique, Discounted Cash Flow | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	0.104
Level 3 | Weighted Average | Collateral prepayment rate | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, measurement input	0.062
Level 3 | Weighted Average | Collateral default rate | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, measurement input	0.013
Level 3 | Minimum | Lifetime CDR | Valuation Technique, Discounted Cash Flow | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	0
Level 3 | Minimum | Loss severity | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, measurement input	0.115
Level 3 | Minimum | Yield | Valuation Technique, Discounted Cash Flow | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	0.120
Level 3 | Minimum | Yield | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, measurement input	0.049
Level 3 | Minimum | Discount rate | Valuation Technique, Discounted Cash Flow | Equity investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity method investment, measurement input	13.80%
Level 3 | Minimum | Months to assumed redemption | Valuation Technique, Discounted Cash Flow | Equity investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned, assumed redemption period (in months)	3 months
Level 3 | Minimum | Lifetime voluntary prepayment rate | Valuation Technique, Discounted Cash Flow | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	0.010
Level 3 | Minimum | Collateral prepayment rate | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, measurement input	0
Level 3 | Minimum | Collateral default rate | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, measurement input	0
Level 3 | Maximum | Lifetime CDR | Valuation Technique, Discounted Cash Flow | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	0.398
Level 3 | Maximum | Loss severity | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, measurement input	0.789
Level 3 | Maximum | Yield | Valuation Technique, Discounted Cash Flow | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	0.140
Level 3 | Maximum | Yield | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, measurement input	0.130
Level 3 | Maximum | Discount rate | Valuation Technique, Discounted Cash Flow | Equity investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity method investment, measurement input	17.50%
Level 3 | Maximum | Months to assumed redemption | Valuation Technique, Discounted Cash Flow | Equity investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned, assumed redemption period (in months)	48 months
Level 3 | Maximum | Lifetime voluntary prepayment rate | Valuation Technique, Discounted Cash Flow | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing asset, measurement input	0.267
Level 3 | Maximum | Collateral prepayment rate | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, measurement input	0.072
Level 3 | Maximum | Collateral default rate | Valuation Technique, Discounted Cash Flow | VIE, Primary Beneficiary | Consolidated SLST | Consolidated SLST
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, measurement input	0.085
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, at fair value	$ 2,698,518,000
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Valuation Technique Liquidation Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, at fair value	$ 177,548,000
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Weighted Average | Lifetime CPR | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	0.070
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Weighted Average | Lifetime CDR | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	0.006
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Weighted Average | Loss severity | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	0.108
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Weighted Average | Yield | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	0.077
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Weighted Average | Yield | Valuation Technique Liquidation Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	0.076
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Weighted Average | Annual home price appreciation/(depreciation) | Valuation Technique Liquidation Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	0.004
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Weighted Average | Liquidation timeline (months) | Valuation Technique Liquidation Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	17
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Weighted Average | Property value | Valuation Technique Liquidation Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	2,277,934
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Minimum | Lifetime CPR | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	0
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Minimum | Lifetime CDR | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	0
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Minimum | Loss severity | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	0
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Minimum | Yield | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	0.059
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Minimum | Yield | Valuation Technique Liquidation Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	0.075
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Minimum | Annual home price appreciation/(depreciation) | Valuation Technique Liquidation Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	0
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Minimum | Liquidation timeline (months) | Valuation Technique Liquidation Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	1
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Minimum | Property value | Valuation Technique Liquidation Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	13,000
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Maximum | Lifetime CPR | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	0.440
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Maximum | Lifetime CDR | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	0.240
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Maximum | Loss severity | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	1.000
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Maximum | Yield | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	0.414
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Maximum | Yield | Valuation Technique Liquidation Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	0.268
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Maximum | Annual home price appreciation/(depreciation) | Valuation Technique Liquidation Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	0.092
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Maximum | Liquidation timeline (months) | Valuation Technique Liquidation Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	54
Residential Loans and Residential Loans Held in Securitization Trusts | Level 3 | Maximum | Property value | Valuation Technique Liquidation Model
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, measurement input	14,200,000
Multi-family loans | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans receivable, at fair value	$ 86,192,000
Multi-family loans | Level 3 | Weighted Average | Loss severity | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned, measurement input	0.00%
Multi-family loans | Level 3 | Weighted Average | Discount rate | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned, measurement input	12.50%
Multi-family loans | Level 3 | Weighted Average | Months to assumed redemption | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned, assumed redemption period (in months)	29 months
Multi-family loans | Level 3 | Minimum | Discount rate | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned, measurement input	11.00%
Multi-family loans | Level 3 | Minimum | Months to assumed redemption | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned, assumed redemption period (in months)	2 months
Multi-family loans | Level 3 | Maximum | Discount rate | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned, measurement input	14.00%
Multi-family loans | Level 3 | Maximum | Months to assumed redemption | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned, assumed redemption period (in months)	50 months

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Equity and Mezzanine Loans, Fair Value

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Equity Method Investment, Measurement Input

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Financing Receivable, Measurement Input

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Fair value portion of investments accounted under the equity method.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Value of input used to measure long-term debt.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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