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Fair Value of Financial Instruments - Carrying Value and Estimated Fair Value of the Company's Financial Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023
--- | --- | --- | ---
Financial Assets: |  |  |
Cash and cash equivalents | $ 226,939 | $ 187,107 | $ 227,753
Equity Investments, carrying value | 137,943 | 147,116 |
Derivative Asset, carrying value | 7,143 | 6,510 |
Collateralized debt obligations: |  |  |
Subordinated debentures, carrying value | 45,000 | 45,000 |
Senior unsecured notes, carrying value | 98,299 | $ 98,111 |
Mortgages payable on operating real estate, carrying value | $ 1,000,217 |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets |
Fair Value, Measurements, Recurring |  |  |
Financial Assets: |  |  |
Equity Investment, estimated fair value | $ 137,943 | $ 147,116 |
VIE, Primary Beneficiary | Mortgages |  |  |
Collateralized debt obligations: |  |  |
Mortgages payable on operating real estate, carrying value | 850,743 | 784,421 |
Residential loan securitizations at amortized cost, net |  |  |
Collateralized debt obligations: |  |  |
Carrying Value | 1,108,594 | 1,276,780 |
Residential loan securitizations at amortized cost, net | VIE, Primary Beneficiary |  |  |
Collateralized debt obligations: |  |  |
Carrying Value | 1,108,594 | 1,276,780 |
Consolidated SLST |  |  |
Collateralized debt obligations: |  |  |
Carrying Value | 1,079,768 | 593,737 |
Consolidated SLST | VIE, Primary Beneficiary |  |  |
Collateralized debt obligations: |  |  |
Carrying Value | 1,079,768 | 593,737 |
Level 1 |  |  |
Financial Assets: |  |  |
Cash and cash equivalents | 226,939 | 187,107 |
Cash and cash equivalents, estimated fair value | 226,939 | 187,107 |
Level 1 | Fair Value, Measurements, Recurring |  |  |
Financial Assets: |  |  |
Equity Investment, estimated fair value | 0 | 0 |
Level 3 |  |  |
Financial Assets: |  |  |
Equity Investments, carrying value | 137,943 | 147,116 |
Equity Investment, estimated fair value | 137,943 | 147,116 |
Collateralized debt obligations: |  |  |
Subordinated debentures, carrying value | 45,000 | 45,000 |
Subordinated debentures, estimated fair value | 28,518 | 32,137 |
Level 3 | Fair Value, Measurements, Recurring |  |  |
Financial Assets: |  |  |
Equity Investment, estimated fair value | 137,943 | 147,116 |
Level 3 | Mortgages |  |  |
Collateralized debt obligations: |  |  |
Mortgages payable on operating real estate, carrying value | 850,743 | 784,421 |
Mortgages payable on operating real estate, estimated fair value | 825,042 | 761,194 |
Mortgages payable on real estate in disposal group held for sale, carrying value | 119,640 | 378,386 |
Mortgages payable on real estate in disposal group held for sale, estimated fair value | 118,669 | 377,735 |
Level 3 | Residential loan securitizations at amortized cost, net |  |  |
Collateralized debt obligations: |  |  |
Carrying Value | 1,108,594 | 1,276,780 |
Collateralized debt obligations, fair value | 1,082,924 | 1,237,531 |
Level 3 | Consolidated SLST | VIE, Primary Beneficiary |  |  |
Collateralized debt obligations: |  |  |
Carrying Value | 582,627 | 593,737 |
Collateralized debt obligations, fair value | 582,627 | 593,737 |
Level 3 | Residential loans |  |  |
Financial Assets: |  |  |
Residential loans, carrying value | 3,103,105 | 3,084,303 |
Residential mortgage loans at fair value | 3,103,105 | 3,084,303 |
Level 3 | Multi-family loans |  |  |
Financial Assets: |  |  |
Preferred equity and mezzanine loan investments, carrying value | 91,905 | 95,792 |
Preferred equity and mezzanine loan investments, estimated fair value | 91,905 | 95,792 |
Level 2 |  |  |
Financial Assets: |  |  |
Investment securities available for sale: | 2,241,340 | 2,013,817 |
Derivative Asset, carrying value | 7,143 | 6,510 |
Derivative Asset, estimated fair value | 7,143 | 6,510 |
Derivative assets in disposal group held for sale, carrying value | 740 | 2,960 |
Derivative assets in disposal group held for sale, estimated fair value | 740 | 2,960 |
Collateralized debt obligations: |  |  |
Senior unsecured notes, carrying value | 98,299 | 98,111 |
Senior unsecured notes, estimated fair value | 95,861 | 94,952 |
Level 2 | Fair Value, Measurements, Recurring |  |  |
Financial Assets: |  |  |
Equity Investment, estimated fair value | 0 | 0 |
Level 2 | Repurchase agreements |  |  |
Financial Liabilities: |  |  |
Repurchase agreements | 2,512,008 | 2,471,113 |
Level 2 | Residential loan securitizations at amortized cost, net |  |  |
Collateralized debt obligations: |  |  |
Residential loan securitizations at fair value, carrying value | 497,141 | 0 |
Residential loan securitizations at fair value | $ 497,141 | $ 0 |

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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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- Definition The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481961/940-320-45-2 + Details
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