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Fair Value of Financial Instruments - Schedule of Carrying Value and Estimated Fair Value of the Company's Financial Assets and Liabilities (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Financial Assets: |  |  |
Cash and cash equivalents | $ 167,422,000 | $ 187,107,000 | $ 244,718,000
Equity Investments, carrying value | 113,492,000 | 147,116,000 |
Derivative Asset, carrying value | 56,000 | 6,510,000 |
Mortgage servicing rights, estimated fair value | 21,003,000 | 0 | 0
Collateralized debt obligations: |  |  |
Subordinated debentures, carrying value | 45,000,000 | 45,000,000 |
Senior unsecured notes: |  |  |
Senior unsecured notes, carrying value | 159,196,000 | $ 98,111,000 |
Mortgages payable on real estate, carrying value | $ 573,158,000 |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets |
Fair Value, Measurements, Recurring |  |  |
Financial Assets: |  |  |
Equity investments | $ 113,492,000 | $ 147,116,000 |
VIE, Primary Beneficiary |  |  |
Financial Assets: |  |  |
Residential loans | 285,057,000 |  |
Collateralized debt obligations: |  |  |
Carrying value | 275,200,000 |  |
VIE, Primary Beneficiary | Mortgages payable on real estate |  |  |
Senior unsecured notes: |  |  |
Mortgages payable on real estate, carrying value | 366,606,000 | 784,421,000 |
Residential loan securitizations at amortized cost, net |  |  |
Collateralized debt obligations: |  |  |
Carrying value | 842,764,000 | 1,276,780,000 |
Residential loan securitizations at amortized cost, net | VIE, Primary Beneficiary |  |  |
Collateralized debt obligations: |  |  |
Carrying value | 842,764,000 | 1,276,780,000 |
Consolidated SLST |  |  |
Collateralized debt obligations: |  |  |
Carrying value | 2,135,680,000 | 593,737,000 |
Consolidated SLST | VIE, Primary Beneficiary |  |  |
Collateralized debt obligations: |  |  |
Carrying value | 2,135,680,000 | 593,737,000 |
Senior unsecured notes at amortized cost, net |  |  |
Senior unsecured notes: |  |  |
Senior unsecured notes, carrying value | 98,886,000 | 98,111,000 |
Senior unsecured notes at fair value |  |  |
Senior unsecured notes: |  |  |
Senior unsecured notes, carrying value | 60,310,000 |  |
Level 1 | Fair Value, Measurements, Recurring |  |  |
Financial Assets: |  |  |
Cash and cash equivalents | 167,422,000 | 187,107,000 |
Cash and cash equivalents, estimated fair value | 167,422,000 | 187,107,000 |
Equity investments | 0 | 0 |
Level 3 |  |  |
Financial Assets: |  |  |
Mortgage servicing rights, estimated fair value | 616,000 | 0 | $ 0
Level 3 | Fair Value, Measurements, Recurring |  |  |
Financial Assets: |  |  |
Equity Investments, carrying value | 113,492,000 | 147,116,000 |
Equity investments | 113,492,000 | 147,116,000 |
Mortgage servicing rights, carrying value | 21,003,000 | 0 |
Mortgage servicing rights, estimated fair value | 21,003,000 | 0 |
Collateralized debt obligations: |  |  |
Subordinated debentures, carrying value | 45,000,000 | 45,000,000 |
Subordinated debentures, estimated fair value | 38,918,000 | 32,137,000 |
Level 3 | Mortgages payable on real estate | Fair Value, Measurements, Recurring |  |  |
Senior unsecured notes: |  |  |
Mortgages payable on real estate, carrying value | 366,606,000 | 784,421,000 |
Mortgages payable on real estate, estimated fair value | 347,915,000 | 761,194,000 |
Mortgages payable on real estate in disposal group held for sale, carrying value | 93,370,000 | 378,386,000 |
Mortgages payable on real estate in disposal group held for sale, estimated fair value | 93,370,000 | 377,735,000 |
Level 3 | Residential loan securitizations at amortized cost, net | Fair Value, Measurements, Recurring |  |  |
Collateralized debt obligations: |  |  |
Carrying value | 842,764,000 | 1,276,780,000 |
Collateralized debt obligations, fair value | 818,482,000 | 1,237,531,000 |
Level 3 | Consolidated SLST | Fair Value, Measurements, Recurring |  |  |
Collateralized debt obligations: |  |  |
Consolidated SLST Carring Value | 811,591,000 | 593,737,000 |
Consolidated SLST estimated fair value | 811,591,000 | 593,737,000 |
Level 3 | Residential loans | Fair Value, Measurements, Recurring |  |  |
Financial Assets: |  |  |
Residential loans | 3,841,738,000 | 3,084,303,000 |
Residential mortgage loans at fair value | 3,841,738,000 | 3,084,303,000 |
Level 3 | Multi-family loans | Fair Value, Measurements, Recurring |  |  |
Financial Assets: |  |  |
Preferred equity and mezzanine loan investments, carrying value | 86,192,000 | 95,792,000 |
Preferred equity and mezzanine loan investments, estimated fair value | 86,192,000 | 95,792,000 |
Level 2 | Fair Value, Measurements, Recurring |  |  |
Financial Assets: |  |  |
Investment securities available for sale: | 3,828,544,000 | 2,013,817,000 |
Equity investments | 0 | 0 |
Derivative Asset, carrying value | 56,000 | 6,510,000 |
Derivative Asset, estimated fair value | 56,000 | 6,510,000 |
Derivative assets in disposal group held for sale, carrying value | 67,000 | 2,960,000 |
Derivative assets in disposal group held for sale, estimated fair value | 67,000 | 2,960,000 |
Level 2 | Repurchase agreements | Fair Value, Measurements, Recurring |  |  |
Financial Liabilities: |  |  |
Repurchase agreements | 4,012,225,000 | 2,471,113,000 |
Level 2 | Residential loan securitizations at amortized cost, net | Fair Value, Measurements, Recurring |  |  |
Collateralized debt obligations: |  |  |
Residential loan securitizations at fair value, carrying value | 1,253,332,000 | 0 |
Residential loan securitizations at fair value | 1,253,332,000 | 0 |
Level 2 | Non-Agency RMBS re-securitization | VIE, Primary Beneficiary | Fair Value, Measurements, Recurring |  |  |
Collateralized debt obligations: |  |  |
Carrying value | 70,757,000 | 0 |
Collateralized debt obligations, fair value | 70,757,000 | 0 |
Level 2 | Senior unsecured notes at amortized cost, net | Fair Value, Measurements, Recurring |  |  |
Senior unsecured notes: |  |  |
Senior unsecured notes, carrying value | 98,886,000 | 98,111,000 |
Senior unsecured notes, estimated fair value | 98,632,000 | 94,952,000 |
Level 2 | Senior unsecured notes at fair value | Fair Value, Measurements, Recurring |  |  |
Senior unsecured notes: |  |  |
Senior unsecured notes, carrying value | 60,310,000 | 0 |
Senior unsecured notes, estimated fair value | $ 60,310,000 | $ 0 |

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- Definition Carrying amounts of receivables due as of the balance sheet date from parties or arising from transactions not otherwise specified in the taxonomy. Sum of the carrying amount for an unclassified balance sheet date of expenditures made in advance of when the economic benefit of the cost will be realized, and which will be expensed in future periods with the passage of time or when a triggering event occurs and the carrying amount as of the balance sheet date of assets not otherwise specified in the taxonomy. Also includes assets not individually reported in the financial statements, or not separately disclosed in notes. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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