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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Assets and Liabilities of Consolidated VIEs (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | $ 649,822 | $ 118,763 | $ 65,906
Investment securities available for sale |  | 323,399 | 1,760,812 |
Receivables and other assets |  | 142,945 | 169,214 |
Total Assets | [1] | 4,621,113 | 23,483,369 |
Accrued expenses and other liabilities |  | 79,900 | 177,260 |
Total Liabilities | [1] | 2,367,730 | 21,278,340 |
Residential collateralized debt obligations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | 268,820 | 40,429 |
Residential collateralized debt obligations, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | 1,077,980 | 1,052,829 |
Multi-family collateralized debt obligations, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | 0 | 16,724,451 |
Other |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Total Liabilities |  |  | 75 |
Financing And Other VIEs | Residential loans, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, at fair value |  |  | 1,328,886 |
VIE, Primary Beneficiary |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Total Assets |  | 1,852,657 | 19,270,384 |
Total Liabilities |  | 1,440,936 | 17,878,314 |
VIE, Primary Beneficiary | Residential Loan Securitizations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | 0 | 0 |
Receivables and other assets |  | 12,568 | 1,328 |
Total Assets |  | 368,054 | 45,358 |
Accrued expenses and other liabilities |  | 1,211 | 14 |
Total Liabilities |  | 270,031 | 40,443 |
VIE, Primary Beneficiary | Residential Loan Securitizations | Residential collateralized debt obligations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | 268,820 | 40,429 |
VIE, Primary Beneficiary | Residential Loan Securitizations | Residential loans, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, at fair value |  | 355,486 |  |
VIE, Primary Beneficiary | Residential Loan Securitizations | Residential loans, net |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential mortgage loans held in securitization trusts, net |  |  | 44,030 |
VIE, Primary Beneficiary | Non-Agency RMBS Re-Securitization |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investment securities available for sale |  | 131,836 |  |
Receivables and other assets |  | 50,635 |  |
Total Assets |  | 182,471 |  |
Collateralized debt obligations |  | 88,791 |  |
Accrued expenses and other liabilities |  | 396 |  |
Total Liabilities |  | 89,187 |  |
VIE, Primary Beneficiary | Non-Agency RMBS Re-Securitization | Residential collateralized debt obligations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | 0 |  |
VIE, Primary Beneficiary | Non-Agency RMBS Re-Securitization | Residential loans, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, at fair value |  | 0 |  |
VIE, Primary Beneficiary | Consolidated K-Series |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  |  | 0 |
Receivables and other assets |  |  | 59,417 |
Total Assets |  |  | 17,876,163 |
Accrued expenses and other liabilities |  |  | 57,873 |
Total Liabilities |  |  | 16,782,324 |
VIE, Primary Beneficiary | Consolidated K-Series | Multi-family collateralized debt obligations, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  |  | 16,724,451 |
VIE, Primary Beneficiary | Consolidated K-Series | Multi-family loans held in securitization trusts, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Multi-family loans held in securitization trusts, at fair value |  |  | 17,816,746 |
VIE, Primary Beneficiary | Consolidated SLST |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | 0 |  |
Receivables and other assets |  | 4,162 | 5,244 |
Total Assets |  | 1,294,167 | 1,334,130 |
Accrued expenses and other liabilities |  | 3,664 | 2,643 |
Total Liabilities |  | 1,081,644 | 1,055,472 |
VIE, Primary Beneficiary | Consolidated SLST | Residential collateralized debt obligations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | 0 |  |
VIE, Primary Beneficiary | Consolidated SLST | Residential collateralized debt obligations, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | 1,077,980 | 1,052,829 |
VIE, Primary Beneficiary | Consolidated SLST | Residential loans, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, at fair value |  | 1,290,005 | 1,328,886 |
VIE, Primary Beneficiary | Other |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | 4,305 | 107 |
Receivables and other assets |  | 3,660 | 14,626 |
Total Assets |  | 7,965 | 14,733 |
Accrued expenses and other liabilities |  | 74 | 75 |
Total Liabilities |  | 74 |  |
VIE, Primary Beneficiary | Other | Residential collateralized debt obligations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | 0 |  |
VIE, Primary Beneficiary | Financing And Other VIEs |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | 4,305 | 107 |
Investment securities available for sale |  | 131,836 |  |
Receivables and other assets |  | 71,025 | 80,615 |
Total Assets |  | 1,852,657 | 19,270,384 |
Collateralized debt obligations |  | 88,791 |  |
Accrued expenses and other liabilities |  | 5,345 | 60,605 |
Total Liabilities |  | 1,440,936 | 17,878,314 |
VIE, Primary Beneficiary | Financing And Other VIEs | Residential collateralized debt obligations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | 268,820 | 40,429 |
VIE, Primary Beneficiary | Financing And Other VIEs | Residential collateralized debt obligations, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  | 1,077,980 | 1,052,829 |
VIE, Primary Beneficiary | Financing And Other VIEs | Multi-family collateralized debt obligations, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations |  |  | 16,724,451 |
VIE, Primary Beneficiary | Financing And Other VIEs | Residential loans, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, at fair value |  | $ 1,645,491 |  |
VIE, Primary Beneficiary | Financing And Other VIEs | Residential loans, net |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential mortgage loans held in securitization trusts, net |  |  | 44,030 |
VIE, Primary Beneficiary | Financing And Other VIEs | Multi-family loans held in securitization trusts, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Multi-family loans held in securitization trusts, at fair value |  |  | $ 17,816,746 |
[1] | Our condensed consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs") as the Company is the primary beneficiary of these VIEs. As of September 30, 2020 and December 31, 2019, assets of consolidated VIEs totaled $1,852,657 and $19,270,384, respectively, and the liabilities of consolidated VIEs totaled $1,440,936 and $17,878,314, respectively. See Note 9 for further discussion.

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