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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, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | $ 408,785 | $ 293,183 | $ 649,822
Investment securities available for sale, at fair value |  | 140,597 | 311,284 |
Other assets |  | 136,692 | 115,292 |
Total Assets | [1] | 4,912,809 | 4,655,587 |
Other Liabilities |  | 121,256 | 101,746 |
Liabilities | [1] | 2,550,390 | 2,348,014 |
Non-controlling interest in consolidated variable interest entities |  | 4,626 | 6,371 |
Residential collateralized debt obligations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Multi-family CDOs, at fair value |  | 710,102 | 569,323 |
Residential Collateralized Debt Obligations, at Fair Value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Multi-family CDOs, at fair value |  | 904,976 | 1,054,335 |
VIE, Primary Beneficiary |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Total Assets |  | 2,217,348 | 2,150,984 |
Liabilities |  | 1,793,066 | 1,667,306 |
VIE, Primary Beneficiary | Residential collateralized debt obligations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Multi-family CDOs, at fair value |  | 710,102 | 569,323 |
VIE, Primary Beneficiary | Residential Collateralized Debt Obligations, at Fair Value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Multi-family CDOs, at fair value |  | 904,976 | 1,054,335 |
VIE, Primary Beneficiary | Residential Loan Securitizations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | 0 | 0 |
Investment securities available for sale, at fair value |  |  | 0 |
Operating real estate, net held in Consolidated VIEs |  | 0 | 0 |
Other assets |  | 33,141 | 24,959 |
Total Assets |  | 844,724 | 716,410 |
Multi-family CDOs, at fair value |  | 710,102 | 554,067 |
Mortgages payable in consolidated variable interest entities |  | 0 | 0 |
Other Liabilities |  | 6,326 | 2,610 |
Liabilities |  | 716,428 | 556,677 |
Non-controlling interest in consolidated variable interest entities |  | 0 | 0 |
Net investment |  | 128,296 | 159,733 |
VIE, Primary Beneficiary | Residential Loan Securitizations | Residential loans |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, at fair value |  | 811,583 | 691,451 |
VIE, Primary Beneficiary | Non-Agency RMBS Re-Securitization |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  |  | 0 |
Investment securities available for sale, at fair value |  |  | 109,140 |
Operating real estate, net held in Consolidated VIEs |  |  | 0 |
Other assets |  |  | 535 |
Total Assets |  |  | 109,675 |
Multi-family CDOs, at fair value |  |  | 15,256 |
Mortgages payable in consolidated variable interest entities |  |  | 0 |
Other Liabilities |  |  | 70 |
Liabilities |  |  | 15,326 |
Non-controlling interest in consolidated variable interest entities |  |  | 0 |
Net investment |  |  | 94,349 |
VIE, Primary Beneficiary | Non-Agency RMBS Re-Securitization | Residential loans |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, at fair value |  |  | 0 |
VIE, Primary Beneficiary | Consolidated SLST |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | 0 | 0 |
Investment securities available for sale, at fair value |  |  | 0 |
Operating real estate, net held in Consolidated VIEs |  | 0 | 0 |
Other assets |  | 3,702 | 4,075 |
Total Assets |  | 1,140,707 | 1,270,860 |
Multi-family CDOs, at fair value |  | 904,976 | 1,054,335 |
Mortgages payable in consolidated variable interest entities |  | 0 | 0 |
Other Liabilities |  | 3,073 | 2,781 |
Liabilities |  | 908,049 | 1,057,116 |
Non-controlling interest in consolidated variable interest entities |  | 0 | 0 |
Net investment |  | 232,658 | 213,744 |
VIE, Primary Beneficiary | Consolidated SLST | Residential loans |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, at fair value |  | 1,137,005 | 1,266,785 |
VIE, Primary Beneficiary | Other |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | 3,457 | 462 |
Investment securities available for sale, at fair value |  |  | 0 |
Operating real estate, net held in Consolidated VIEs |  | 209,736 | 50,532 |
Other assets |  | 18,724 | 3,045 |
Total Assets |  | 231,917 | 54,039 |
Multi-family CDOs, at fair value |  | 0 | 0 |
Mortgages payable in consolidated variable interest entities |  | 163,941 | 36,752 |
Other Liabilities |  | 4,648 | 1,435 |
Liabilities |  | 168,589 | 38,187 |
Non-controlling interest in consolidated variable interest entities |  | 4,626 | 6,371 |
Net investment |  | 58,702 | 9,481 |
VIE, Primary Beneficiary | Other | Residential loans |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, at fair value |  | 0 | 0 |
VIE, Primary Beneficiary | Financing And Other VIEs |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | 3,457 | 462 |
Investment securities available for sale, at fair value |  |  | 109,140 |
Operating real estate, net held in Consolidated VIEs |  | 209,736 | 50,532 |
Other assets |  | 55,567 | 32,614 |
Total Assets |  | 2,217,348 | 2,150,984 |
Multi-family CDOs, at fair value |  | 1,615,078 | 1,623,658 |
Mortgages payable in consolidated variable interest entities |  | 163,941 | 36,752 |
Other Liabilities |  | 14,047 | 6,896 |
Liabilities |  | 1,793,066 | 1,667,306 |
Non-controlling interest in consolidated variable interest entities |  | 4,626 | 6,371 |
Net investment |  | 419,656 | 477,307 |
VIE, Primary Beneficiary | Financing And Other VIEs | Residential loans |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, at fair value |  | $ 1,948,588 | $ 1,958,236 |
[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, 2021 and December 31, 2020, assets of consolidated VIEs totaled $2,217,348 and $2,150,984, respectively, and the liabilities of consolidated VIEs totaled $1,793,066 and $1,667,306, respectively. See Note 7 for further discussion.

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