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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 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents |  | $ 407,104 |  | $ 289,602 | $ 324,927
Other assets |  | 299,938 |  | 215,019 |
Total Assets | [1] | 7,299,536 |  | 5,658,301 |
Other liabilities |  | 231,066 |  | 161,081 |
Total liabilities | [1] | 5,135,364 |  | 3,226,519 |
Non-controlling interest in Consolidated VIEs |  | 34,080 |  | 24,359 |
Residential collateralized debt obligations |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Multi-family CDOs, at fair value |  | 1,107,091 |  | 682,802 |
Consolidated SLST CDOs |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Multi-family CDOs, at fair value |  | 710,233 |  | 839,419 |
VIE, Primary Beneficiary |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Total Assets |  | 3,952,609 |  | 2,940,513 |
Total liabilities |  | 3,141,474 |  | 2,235,665 |
Redeemable non-controlling interest in Consolidated VIEs |  | 37,101 | $ 53,361 | 66,392 |
VIE, Primary Beneficiary | Residential collateralized debt obligations |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Multi-family CDOs, at fair value |  | 1,107,091 |  | 682,802 |
VIE, Primary Beneficiary | Consolidated SLST CDOs |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Multi-family CDOs, at fair value |  | 710,233 |  | 839,419 |
VIE, Primary Beneficiary | Financing And Other VIEs |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 38,233 |  | 29,606 |
Real estate, net held in Consolidated VIEs |  | 1,649,472 |  | 927,725 |
Other assets |  | 129,031 |  | 110,871 |
Total Assets |  | 3,952,609 |  | 2,940,513 |
Multi-family CDOs, at fair value |  | 1,817,324 |  | 1,522,221 |
Mortgages payable on real estate, net in Consolidated VIEs |  | 1,251,059 |  | 672,568 |
Other liabilities |  | 73,091 |  | 40,876 |
Total liabilities |  | 3,141,474 |  | 2,235,665 |
Redeemable non-controlling interest in Consolidated VIEs |  | 37,101 |  | 66,392 |
Non-controlling interest in Consolidated VIEs |  | 34,080 |  | 24,359 |
Net investment |  | 739,954 |  | 614,097 |
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 |  | 2,135,873 |  | 1,872,311 |
VIE, Primary Beneficiary | Residential Loan Securitizations |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 0 |  | 0 |
Real estate, net held in Consolidated VIEs |  | 0 |  | 0 |
Other assets |  | 77,630 |  | 36,767 |
Total Assets |  | 1,292,725 |  | 838,196 |
Multi-family CDOs, at fair value |  | 1,107,091 |  | 682,802 |
Mortgages payable on real estate, net in Consolidated VIEs |  | 0 |  | 0 |
Other liabilities |  | 43,477 |  | 20,156 |
Total liabilities |  | 1,150,568 |  | 702,958 |
Redeemable non-controlling interest in Consolidated VIEs |  | 0 |  | 0 |
Non-controlling interest in Consolidated VIEs |  | 0 |  | 0 |
Net investment |  | 142,157 |  | 135,238 |
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 |  | 1,215,095 |  | 801,429 |
VIE, Primary Beneficiary | Consolidated SLST |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 0 |  | 0 |
Real estate, net held in Consolidated VIEs |  | 0 |  | 0 |
Other assets |  | 3,314 |  | 3,547 |
Total Assets |  | 924,092 |  | 1,074,429 |
Multi-family CDOs, at fair value |  | 710,233 |  | 839,419 |
Mortgages payable on real estate, net in Consolidated VIEs |  | 0 |  | 0 |
Other liabilities |  | 3,859 |  | 3,193 |
Total liabilities |  | 714,092 |  | 842,612 |
Redeemable non-controlling interest in Consolidated VIEs |  | 0 |  | 0 |
Non-controlling interest in Consolidated VIEs |  | 0 |  | 0 |
Net investment |  | 210,000 |  | 231,817 |
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 |  | 920,778 |  | 1,070,882 |
VIE, Primary Beneficiary | Consolidated Real Estate |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 38,233 |  | 29,606 |
Real estate, net held in Consolidated VIEs |  | 1,649,472 |  | 927,725 |
Other assets |  | 48,087 |  | 70,557 |
Total Assets |  | 1,735,792 |  | 1,027,888 |
Multi-family CDOs, at fair value |  | 0 |  | 0 |
Mortgages payable on real estate, net in Consolidated VIEs |  | 1,251,059 |  | 672,568 |
Other liabilities |  | 25,755 |  | 17,527 |
Total liabilities |  | 1,276,814 |  | 690,095 |
Redeemable non-controlling interest in Consolidated VIEs |  | 37,101 |  | 66,392 |
Non-controlling interest in Consolidated VIEs |  | 34,080 |  | 24,359 |
Net investment |  | 387,797 |  | 247,042 |
VIE, Primary Beneficiary | Consolidated Real Estate | Residential loans, at fair value |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Residential loans, at fair value |  | $ 0 |  | $ 0 |
[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 June 30, 2022 and December 31, 2021, assets of consolidated VIEs totaled $3,952,609 and $2,940,513, respectively, and the liabilities of consolidated VIEs totaled $3,141,474 and $2,235,665, respectively. See Note 7 for further discussion.

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