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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 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | $ 293,183 | $ 118,763 | $ 103,724
Investment securities available for sale, at fair value |  | 311,284 | 1,760,812 |
Residential loans, carrying value |  | 3,049,166 | 2,961,396 |
Loans held in securitization trusts, at fair value |  | 0 | 17,816,746 |
Other assets |  | 165,824 | 169,214 |
Total assets | [1] | 4,655,587 | 23,483,369 |
Other liabilities |  | 138,498 | 177,260 |
Total liabilities | [1] | 2,348,014 | 21,278,340 |
Non-controlling interest in consolidated variable interest entities |  | 6,371 | (704) |
Residential Collateralized Debt Obligations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations, at fair value |  | 569,323 | 40,429 |
Residential collateralized debt obligations, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations, at fair value |  | 1,054,335 | 17,777,280 |
VIE, Primary Beneficiary |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Total assets |  | 2,150,984 | 19,270,384 |
Total liabilities |  | 1,667,306 | 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 |
Investment securities available for sale, at fair value |  | 0 |  |
Operating real estate |  | 0 |  |
Residential loans, carrying value |  |  | 44,030 |
Other assets |  | 24,959 | 1,328 |
Total assets |  | 716,410 | 45,358 |
Collateralized debt obligations, at fair value |  | 554,067 |  |
Mortgages payable in consolidated variable interest entities |  | 0 |  |
Other liabilities |  | 2,610 | 14 |
Total liabilities |  | 556,677 | 40,443 |
Non-controlling interest in consolidated variable interest entities |  | 0 | 0 |
Variable interest entity, primary beneficiary, maximum loss exposure, amount |  | 159,733 | 4,915 |
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 |  | 0 |  |
Other assets |  | 535 |  |
Total assets |  | 109,675 |  |
Collateralized debt obligations, at fair value |  | 15,256 |  |
Mortgages payable in consolidated variable interest entities |  | 0 |  |
Other liabilities |  | 70 |  |
Total liabilities |  | 15,326 |  |
Non-controlling interest in consolidated variable interest entities |  | 0 |  |
Variable interest entity, primary beneficiary, maximum loss exposure, amount |  | 94,349 |  |
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 |  | 0 |  |
Residential loans, carrying value |  |  | 1,328,886 |
Other assets |  | 4,075 | 5,244 |
Total assets |  | 1,270,860 | 1,334,130 |
Collateralized debt obligations, at fair value |  | 1,054,335 | 1,052,829 |
Mortgages payable in consolidated variable interest entities |  | 0 |  |
Other liabilities |  | 2,781 | 2,643 |
Total liabilities |  | 1,057,116 | 1,055,472 |
Non-controlling interest in consolidated variable interest entities |  | 0 | 0 |
Variable interest entity, primary beneficiary, maximum loss exposure, amount |  | 213,744 | 278,658 |
VIE, Primary Beneficiary | Other |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | 462 |  |
Investment securities available for sale, at fair value |  | 0 |  |
Operating real estate |  | 50,532 |  |
Other assets |  | 3,045 |  |
Total assets |  | 54,039 |  |
Collateralized debt obligations, at fair value |  | 0 |  |
Mortgages payable in consolidated variable interest entities |  | 36,752 |  |
Other liabilities |  | 1,435 |  |
Total liabilities |  | 38,187 |  |
Non-controlling interest in consolidated variable interest entities |  | 6,371 |  |
Variable interest entity, primary beneficiary, maximum loss exposure, amount |  | 9,481 |  |
VIE, Primary Beneficiary | Consolidated K-Series |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  |  | 0 |
Residential loans, carrying value |  |  | 0 |
Other assets |  |  | 59,417 |
Total assets |  |  | 17,876,163 |
Collateralized debt obligations, at fair value |  |  | 16,724,451 |
Other liabilities |  |  | 57,873 |
Total liabilities |  |  | 16,782,324 |
Non-controlling interest in consolidated variable interest entities |  |  | 0 |
Variable interest entity, primary beneficiary, maximum loss exposure, amount |  |  | 1,093,839 |
VIE, Primary Beneficiary | KRVI |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  |  | 107 |
Residential loans, carrying value |  |  | 0 |
Other assets |  |  | 14,626 |
Total assets |  |  | 14,733 |
Collateralized debt obligations, at fair value |  |  | 0 |
Other liabilities |  |  | 75 |
Total liabilities |  |  | 75 |
Non-controlling interest in consolidated variable interest entities |  |  | (704) |
Variable interest entity, primary beneficiary, maximum loss exposure, amount |  |  | 15,362 |
VIE, Primary Beneficiary | Financing And Other VIEs |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents |  | 462 | 107 |
Investment securities available for sale, at fair value |  | 109,140 |  |
Operating real estate |  | 50,532 |  |
Residential loans, carrying value |  |  | 1,372,916 |
Other assets |  | 32,614 | 80,615 |
Total assets |  | 2,150,984 | 19,270,384 |
Collateralized debt obligations, at fair value |  | 1,623,658 |  |
Mortgages payable in consolidated variable interest entities |  | 36,752 |  |
Other liabilities |  | 6,896 | 60,605 |
Total liabilities |  | 1,667,306 | 17,878,314 |
Non-controlling interest in consolidated variable interest entities |  | 6,371 | (704) |
Variable interest entity, primary beneficiary, maximum loss exposure, amount |  | 477,307 | 1,392,774 |
VIE, Primary Beneficiary | Residential Collateralized Debt Obligations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations, at fair value |  | 569,323 | 40,429 |
VIE, Primary Beneficiary | Residential Collateralized Debt Obligations | Residential Loan Securitizations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations, at fair value |  |  | 40,429 |
VIE, Primary Beneficiary | Residential Collateralized Debt Obligations | Financing And Other VIEs |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations, at fair value |  |  | 17,817,709 |
VIE, Primary Beneficiary | Residential collateralized debt obligations, at fair value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Collateralized debt obligations, at fair value |  | 1,054,335 | 17,777,280 |
VIE, Primary Beneficiary | Residential Loans |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, carrying value |  |  | 44,030 |
VIE, Primary Beneficiary | 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 | Residential loans, at fair value | Residential Loan Securitizations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, at fair value |  | 691,451 |  |
VIE, Primary Beneficiary | Residential loans, at fair value | Non-Agency RMBS Re-Securitization |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, at fair value |  | 0 |  |
VIE, Primary Beneficiary | Residential loans, at fair value | Consolidated SLST |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, at fair value |  | 1,266,785 |  |
VIE, Primary Beneficiary | Residential loans, at fair value | Other |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, at fair value |  | 0 |  |
VIE, Primary Beneficiary | Residential loans, at fair value | Financing And Other VIEs |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Residential loans, at fair value |  | $ 1,958,236 |  |
VIE, Primary Beneficiary | Multi-family Loans Held In Securitization Trusts, At Fair Value | Residential Loan Securitizations |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Loans held in securitization trusts, at fair value |  |  | 0 |
VIE, Primary Beneficiary | Multi-family Loans Held In Securitization Trusts, At Fair Value | Consolidated SLST |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Loans held in securitization trusts, at fair value |  |  | 0 |
VIE, Primary Beneficiary | Multi-family Loans Held In Securitization Trusts, At Fair Value | Consolidated K-Series |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Loans held in securitization trusts, at fair value |  |  | 17,816,746 |
VIE, Primary Beneficiary | Multi-family Loans Held In Securitization Trusts, At Fair Value | KRVI |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Loans held in securitization trusts, at fair value |  |  | 0 |
VIE, Primary Beneficiary | Multi-family Loans Held In Securitization Trusts, At Fair Value | Financing And Other VIEs |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Loans held in securitization trusts, at fair value |  |  | $ 17,816,746 |
[1] | Our 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 December 31, 2020 and December 31, 2019, assets of consolidated VIEs totaled $2,150,984 and $19,270,384, respectively, and the liabilities of consolidated VIEs totaled $1,667,306 and $17,878,314, respectively. See Note 7 for further discussion.

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