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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 | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Financial Assets: |  |  |
Cash and cash equivalents | $ 65,906 | $ 103,724 | $ 57,471
Investment securities available for sale | 1,904,018 | 1,512,252 |
Preferred equity and mezzanine loan investments, carrying value | 205,642 | 114,821 |
Derivative assets | 20,673 | 10,263 |
Financial Liabilities |  |  |
Outstanding repurchase agreements | 1,823,910 | 1,543,577 |
Subordinated debentures, carrying value | 45,000 | 45,000 |
Convertible notes, carrying value | 132,395 | 130,762 |
Residential collateralized debt obligations |  |  |
Financial Liabilities |  |  |
Secured debt, carrying value | 42,119 | 53,040 |
Multi-family collateralized debt obligations |  |  |
Financial Liabilities |  |  |
Secured debt, carrying value | 14,978,199 | 11,022,248 |
Level 1 |  |  |
Financial Assets: |  |  |
Cash and cash equivalents | 65,906 | 103,724 |
Cash and cash equivalents, estimated fair value | 65,906 | 103,724 |
Level 3 |  |  |
Financial Assets: |  |  |
Investment in unconsolidated entities, carrying value | 168,933 | 73,466 |
Investments in unconsolidated entities, estimated fair value | 170,150 | 73,833 |
Preferred equity and mezzanine loan investments, carrying value | 178,997 | 165,555 |
Preferred equity and mezzanine loan investments, estimated fair value | 181,626 | 167,739 |
Mortgage loans held for sale, net, carrying value | 2,437 | 3,414 |
Mortgage loans held for sale, net, estimated fair value | 2,525 | 3,584 |
Mortgage loans held for investment, carrying value | 0 | 1,580 |
Mortgage loans held for investment, estimated fair value | 0 | 1,580 |
Financial Liabilities |  |  |
Secured debt, carrying value | 0 | 42,335 |
Secured debt, estimated fair value | 0 | 45,030 |
Subordinated debentures, carrying value | 45,000 | 45,000 |
Subordinated debentures, estimated fair value | 41,273 | 44,897 |
Level 3 | Residential collateralized debt obligations |  |  |
Financial Liabilities |  |  |
Secured debt, carrying value | 42,119 | 53,040 |
Secured debt, estimated fair value | 40,534 | 50,031 |
Level 3 | Multi-family collateralized debt obligations |  |  |
Financial Liabilities |  |  |
Secured debt, carrying value | 14,978,199 | 11,022,248 |
Secured debt, estimated fair value | 14,978,199 | 11,022,248 |
Level 3 | Distressed and other residential mortgage loans, at fair value |  |  |
Financial Assets: |  |  |
Residential mortgage loans, carrying value | 1,116,128 | 737,523 |
Residential mortgage loans, estimated fair value | 1,116,128 | 737,523 |
Level 3 | Distressed residential mortgage loans |  |  |
Financial Assets: |  |  |
Residential mortgage loans, carrying value | 210,466 | 285,261 |
Residential mortgage loans, estimated fair value | 213,398 | 289,376 |
Level 3 | Multi-family loans held in securitization trusts |  |  |
Financial Assets: |  |  |
Residential mortgage loans, carrying value | 15,863,264 | 11,679,847 |
Residential mortgage loans, estimated fair value | 15,863,264 | 11,679,847 |
Level 2 |  |  |
Financial Assets: |  |  |
Derivative assets | 20,673 | 10,263 |
Financial Liabilities |  |  |
Convertible notes, carrying value | 132,395 | 130,762 |
Convertible notes, estimated fair value | 140,557 | 135,689 |
Level 2 | Portfolio Investments |  |  |
Financial Liabilities |  |  |
Outstanding repurchase agreements | $ 2,559,880 | $ 2,131,505 |

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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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