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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, 2022 | Dec. 31, 2021 | Mar. 31, 2021
--- | --- | --- | ---
Financial Assets: |  |  |
Cash and cash equivalents | $ 303,762 | $ 289,602 | $ 290,977
Investment securities available for sale: | 25,073 | 29,520 |
Equity Investments, carrying value | 225,300 | 239,631 |
Financial Liabilities: |  |  |
Subordinated debentures, carrying value | 45,000 | 45,000 |
Convertible notes, carrying value | 0 | 137,898 |
Senior unsecured notes, carrying value | 96,870 | 96,704 |
Mortgages payable on operating real estate, carrying value | 1,247,179 |  |
Residential collateralized debt obligations |  |  |
Financial Liabilities: |  |  |
Collateralized debt, carrying value | 1,143,855 | 682,802 |
Consolidated SLST CDOs |  |  |
Financial Liabilities: |  |  |
Collateralized debt, carrying value | 754,264 | 839,419 |
Level 1 |  |  |
Financial Assets: |  |  |
Cash and cash equivalents | 303,762 | 289,602 |
Cash and cash equivalents, estimated fair value | 303,762 | 289,602 |
Level 2 |  |  |
Financial Assets: |  |  |
Investment securities available for sale: | 145,780 | 200,844 |
Financial Liabilities: |  |  |
Convertible notes, carrying value | 0 | 137,898 |
Convertible notes, estimated fair value | 0 | 138,011 |
Senior unsecured notes, carrying value | 96,870 | 96,704 |
Senior unsecured notes, estimated fair value | 97,246 | 102,215 |
Level 2 | Portfolio Investments |  |  |
Financial Liabilities: |  |  |
Outstanding repurchase agreements | 927,049 | 554,259 |
Level 3 |  |  |
Financial Assets: |  |  |
Equity Investments, carrying value | 225,300 | 239,631 |
Equity Investment, estimated fair value | 225,300 | 239,631 |
Financial Liabilities: |  |  |
Subordinated debentures, carrying value | 45,000 | 45,000 |
Subordinated debentures, estimated fair value | 44,448 | 44,388 |
Level 3 | Mortgage Note |  |  |
Financial Liabilities: |  |  |
Mortgages payable on operating real estate, carrying value | 1,083,371 | 709,356 |
Mortgages payable on operating real estate, estimated fair value | 1,079,742 | 712,112 |
Level 3 | Residential collateralized debt obligations |  |  |
Financial Liabilities: |  |  |
Collateralized debt, carrying value | 1,143,855 | 682,802 |
Secured debt, estimated fair value | 1,110,428 | 686,027 |
Level 3 | Consolidated SLST CDOs |  |  |
Financial Liabilities: |  |  |
Collateralized debt, carrying value | 754,264 | 839,419 |
Secured debt, estimated fair value | 754,264 | 839,419 |
Level 3 | Residential loans |  |  |
Financial Assets: |  |  |
Residential loans | 3,953,427 | 3,575,601 |
Residential mortgage loans, estimated fair value | 3,953,427 | 3,575,601 |
Level 3 | Multi-family loans |  |  |
Financial Assets: |  |  |
Preferred equity and mezzanine loan investments, carrying value | 110,208 | 120,021 |
Preferred equity and mezzanine loan investments, estimated fair value | $ 110,208 | $ 120,021 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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