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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, 2020 | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | --- | ---
Financial Assets: |  |  |
Cash and cash equivalents | $ 172,513 | $ 118,763 | $ 65,359
Receivable for securities sold | 213,585 | 0 |
Investment securities available for sale | 442,532 | 1,760,812 |
Investment in unconsolidated entities, carrying value | 211,965 | 189,965 |
Preferred equity and mezzanine loan investments, carrying value | 277,008 | 169,214 |
Derivative assets | 0 | 15,878 |
Financial Liabilities |  |  |
Outstanding repurchase agreements | 713,364 | 2,352,102 |
Subordinated debentures, carrying value | 45,000 | 45,000 |
Convertible notes, carrying value | 133,534 | 132,955 |
Residential collateralized debt obligations |  |  |
Financial Liabilities |  |  |
Secured debt, carrying value | 38,959 | 40,429 |
Residential collateralized debt obligations, at fair value |  |  |
Financial Liabilities |  |  |
Secured debt, carrying value | 1,034,992 | 1,052,829 |
Level 1 |  |  |
Financial Assets: |  |  |
Cash and cash equivalents | 172,513 | 118,763 |
Cash and cash equivalents, estimated fair value | 172,513 | 118,763 |
Receivable for securities sold | 213,585 | 0 |
Level 1 | Cash margin |  |  |
Financial Assets: |  |  |
Cash and cash equivalents | 169,484 | 0 |
Cash and cash equivalents, estimated fair value | 169,484 | 0 |
Level 2 |  |  |
Financial Assets: |  |  |
Investment securities available for sale | 887,308 | 2,006,140 |
Derivative assets | 0 | 15,878 |
Financial Liabilities |  |  |
Convertible notes, carrying value | 133,534 | 132,955 |
Convertible notes, estimated fair value | 76,794 | 140,865 |
Level 2 | Portfolio Investments |  |  |
Financial Liabilities |  |  |
Outstanding repurchase agreements | 1,428,124 | 3,105,416 |
Level 3 |  |  |
Financial Assets: |  |  |
Residential mortgage loans, at fair value | 2,776,630 |  |
Investment in unconsolidated entities, carrying value | 211,965 | 189,965 |
Investments in unconsolidated entities, estimated fair value | 211,965 | 191,359 |
Preferred equity and mezzanine loan investments, carrying value | 179,292 | 180,045 |
Preferred equity and mezzanine loan investments, estimated fair value | 179,292 | 182,465 |
Loans held for sale, net, carrying value | 0 | 2,406 |
Loans held for sale, net, estimated fair value | 0 | 2,482 |
Financial Liabilities |  |  |
Subordinated debentures, carrying value | 45,000 | 45,000 |
Subordinated debentures, estimated fair value | 12,451 | 41,592 |
Level 3 | Residential collateralized debt obligations |  |  |
Financial Liabilities |  |  |
Secured debt, carrying value | 38,959 | 40,429 |
Secured debt, estimated fair value | 35,029 | 38,888 |
Level 3 | Multi-family collateralized debt obligations, at fair value |  |  |
Financial Liabilities |  |  |
Secured debt, carrying value | 0 | 16,724,451 |
Secured debt, estimated fair value | 0 | 16,724,451 |
Level 3 | Residential collateralized debt obligations, at fair value |  |  |
Financial Liabilities |  |  |
Secured debt, carrying value | 1,034,992 | 1,052,829 |
Secured debt, estimated fair value | 1,034,992 | 1,052,829 |
Level 3 | Residential loans |  |  |
Financial Assets: |  |  |
Residential mortgage loans, at fair value | 1,515,347 | 1,429,754 |
Level 3 | Residential loans held in securitization trusts |  |  |
Financial Assets: |  |  |
Residential mortgage loans, at fair value | 42,984 | 0 |
Level 3 | Residential loans, net |  |  |
Financial Assets: |  |  |
Residential mortgage loans | 0 | 202,756 |
Residential mortgage loans, estimated fair value | 0 | 208,471 |
Level 3 | Multi-family loans held in securitization trusts, at fair value |  |  |
Financial Assets: |  |  |
Residential mortgage loans | 0 | 17,816,746 |
Residential mortgage loans, estimated fair value | 0 | 17,816,746 |
VIE, Primary Beneficiary | Level 3 | Residential collateralized debt obligations, at fair value |  |  |
Financial Liabilities |  |  |
Secured debt, carrying value | 1,034,992 |  |
VIE, Primary Beneficiary | Consolidated SLST |  |  |
Financial Liabilities |  |  |
Secured debt, carrying value | 1,034,992 | 1,052,829 |
VIE, Primary Beneficiary | Consolidated SLST | Level 3 |  |  |
Financial Assets: |  |  |
Residential mortgage loans, at fair value | $ 1,218,299 | $ 1,328,886 |

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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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