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Principles of Consolidation - Assets and Liabilities of Consolidated Variable Interest Entity's (Details) $ in Thousands | Dec. 31, 2021 USD ($) investment | Dec. 31, 2020 USD ($) investment | Dec. 31, 2019 USD ($)
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |  |  |
Other investments | [1] | $ 641,969 |  | $ 348,175 |  |
Cash and cash equivalents |  | 450,485 | [1] | 461,260 | [1] | $ 197,000
Restricted cash |  | 80,999 | [1] | 83,190 | [1] | $ 94,000
Accrued interest receivable |  | 47,515 |  | 39,445 |  |
Other assets | [1] | 231,117 |  | 130,588 |  |
Total Assets | [1] | 14,706,944 |  | 10,355,066 |  |
Short-term debt | [1] | 2,177,362 |  | 522,609 |  |
Accrued interest payable |  | 39,297 |  | 34,858 |  |
Accrued expenses and other liabilities | [1] | 245,788 |  | 179,340 |  |
Asset-backed securities issued | [1] | 9,253,557 |  | 7,100,661 |  |
Total liabilities | [1] | 13,320,857 |  | 9,244,167 |  |
CAFL(1) |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Fair value of securities owned |  | 302,000 |  | 239,000 |  |
Carrying value of securities owned |  | 38,000 |  | 0 |  |
Freddie Mac SLST(1) |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Fair value of securities owned |  | 445,000 |  | 428,000 |  |
Carrying value of securities owned |  | 143,000 |  | 200,000 |  |
Business purpose loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value | [1] | 4,432,680 |  | 3,890,959 |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Other investments |  | 544,307 |  | 251,773 |  |
Cash and cash equivalents |  | 6,481 |  | 11,579 |  |
Restricted cash |  | 46,086 |  | 23,368 |  |
Accrued interest receivable |  | 35,401 |  | 30,587 |  |
Other assets |  | 41,826 |  | 9,937 |  |
Total Assets |  | 10,661,081 |  | 8,141,069 |  |
Short-term debt |  | 294,447 |  | 208,375 |  |
Accrued interest payable |  | 25,018 |  | 21,274 |  |
Accrued expenses and other liabilities |  | 46,325 |  | 18,403 |  |
Asset-backed securities issued |  | 9,253,557 |  | 7,100,661 |  |
Total liabilities |  | 9,619,347 |  | 7,348,713 |  |
Estimated fair value of investments |  | $ 1,033,913 |  | $ 789,228 |  |
Number of VIEs | investment |  | 60 |  | 50 |  |
Variable Interest Entity, Primary Beneficiary | Residential loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | $ 5,747,150 |  | $ 4,072,410 |  |
Variable Interest Entity, Primary Beneficiary | Business purpose loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | 3,766,316 |  | 3,249,194 |  |
Variable Interest Entity, Primary Beneficiary | Multifamily loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | 473,514 |  | 492,221 |  |
Variable Interest Entity, Primary Beneficiary | Legacy Sequoia |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Other investments |  | 0 |  | 0 |  |
Cash and cash equivalents |  | 0 |  | 0 |  |
Restricted cash |  | 148 |  | 148 |  |
Accrued interest receivable |  | 210 |  | 305 |  |
Other assets |  | 61 |  | 638 |  |
Total Assets |  | 230,874 |  | 287,026 |  |
Short-term debt |  | 0 |  | 0 |  |
Accrued interest payable |  | 99 |  | 141 |  |
Accrued expenses and other liabilities |  | 0 |  | 0 |  |
Asset-backed securities issued |  | 227,881 |  | 282,326 |  |
Total liabilities |  | 227,980 |  | 282,467 |  |
Estimated fair value of investments |  | $ 2,634 |  | $ 4,559 |  |
Number of VIEs | investment |  | 20 |  | 20 |  |
Variable Interest Entity, Primary Beneficiary | Legacy Sequoia | Residential loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | $ 230,455 |  | $ 285,935 |  |
Variable Interest Entity, Primary Beneficiary | Legacy Sequoia | Business purpose loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | 0 |  | 0 |  |
Variable Interest Entity, Primary Beneficiary | Legacy Sequoia | Multifamily loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | 0 |  | 0 |  |
Variable Interest Entity, Primary Beneficiary | Sequoia |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Other investments |  | 0 |  | 0 |  |
Cash and cash equivalents |  | 0 |  | 0 |  |
Restricted cash |  | 5 |  | 0 |  |
Accrued interest receivable |  | 10,885 |  | 6,802 |  |
Other assets |  | 0 |  | 0 |  |
Total Assets |  | 3,639,355 |  | 1,572,124 |  |
Short-term debt |  | 0 |  | 0 |  |
Accrued interest payable |  | 8,452 |  | 4,697 |  |
Accrued expenses and other liabilities |  | 5 |  | 50 |  |
Asset-backed securities issued |  | 3,383,048 |  | 1,347,357 |  |
Total liabilities |  | 3,391,505 |  | 1,352,104 |  |
Estimated fair value of investments |  | $ 245,417 |  | $ 220,020 |  |
Number of VIEs | investment |  | 16 |  | 10 |  |
Variable Interest Entity, Primary Beneficiary | Sequoia | Residential loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | $ 3,628,465 |  | $ 1,565,322 |  |
Variable Interest Entity, Primary Beneficiary | Sequoia | Business purpose loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | 0 |  | 0 |  |
Variable Interest Entity, Primary Beneficiary | Sequoia | Multifamily loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | 0 |  | 0 |  |
Variable Interest Entity, Primary Beneficiary | CAFL(1) |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Other investments |  | 0 |  | 0 |  |
Cash and cash equivalents |  | 0 |  | 0 |  |
Restricted cash |  | 15,221 |  | 0 |  |
Accrued interest receivable |  | 15,737 |  | 13,055 |  |
Other assets |  | 32,510 |  | 2,930 |  |
Total Assets |  | 3,829,784 |  | 3,265,179 |  |
Short-term debt |  | 0 |  | 0 |  |
Accrued interest payable |  | 11,030 |  | 10,278 |  |
Accrued expenses and other liabilities |  | 1,171 |  | 0 |  |
Asset-backed securities issued |  | 3,474,898 |  | 3,013,093 |  |
Total liabilities |  | 3,487,099 |  | 3,023,371 |  |
Estimated fair value of investments |  | $ 31,657 |  | $ 238,680 |  |
Number of VIEs | investment |  | 16 |  | 14 |  |
Variable Interest Entity, Primary Beneficiary | CAFL(1) | Residential loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | $ 0 |  | $ 0 |  |
Variable Interest Entity, Primary Beneficiary | CAFL(1) | Business purpose loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | 3,766,316 |  | 3,249,194 |  |
Variable Interest Entity, Primary Beneficiary | CAFL(1) | Multifamily loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | 0 |  | 0 |  |
Variable Interest Entity, Primary Beneficiary | Freddie Mac SLST(1) |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Other investments |  | 0 |  | 0 |  |
Cash and cash equivalents |  | 0 |  | 0 |  |
Restricted cash |  | 0 |  | 0 |  |
Accrued interest receivable |  | 5,792 |  | 6,754 |  |
Other assets |  | 2,028 |  | 646 |  |
Total Assets |  | 1,896,050 |  | 2,228,553 |  |
Short-term debt |  | 0 |  | 0 |  |
Accrued interest payable |  | 4,055 |  | 4,846 |  |
Accrued expenses and other liabilities |  | 0 |  | 0 |  |
Asset-backed securities issued |  | 1,588,463 |  | 1,993,919 |  |
Total liabilities |  | 1,592,518 |  | 1,998,765 |  |
Estimated fair value of investments |  | $ 339,419 |  | $ 229,788 |  |
Number of VIEs | investment |  | 3 |  | 2 |  |
Variable Interest Entity, Primary Beneficiary | Freddie Mac SLST(1) | Residential loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | $ 1,888,230 |  | $ 2,221,153 |  |
Variable Interest Entity, Primary Beneficiary | Freddie Mac SLST(1) | Business purpose loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | 0 |  | 0 |  |
Variable Interest Entity, Primary Beneficiary | Freddie Mac SLST(1) | Multifamily loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | 0 |  | 0 |  |
Variable Interest Entity, Primary Beneficiary | Freddie Mac K-Series |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Other investments |  | 0 |  | 0 |  |
Cash and cash equivalents |  | 0 |  | 0 |  |
Restricted cash |  | 0 |  | 0 |  |
Accrued interest receivable |  | 1,315 |  | 1,337 |  |
Other assets |  | 0 |  | 0 |  |
Total Assets |  | 474,829 |  | 493,558 |  |
Short-term debt |  | 0 |  | 0 |  |
Accrued interest payable |  | 1,190 |  | 1,177 |  |
Accrued expenses and other liabilities |  | 0 |  | 0 |  |
Asset-backed securities issued |  | 441,857 |  | 463,966 |  |
Total liabilities |  | 443,047 |  | 465,143 |  |
Estimated fair value of investments |  | $ 301,795 |  | $ 28,415 |  |
Number of VIEs | investment |  | 1 |  | 1 |  |
Variable Interest Entity, Primary Beneficiary | Freddie Mac K-Series | Residential loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | $ 0 |  | $ 0 |  |
Variable Interest Entity, Primary Beneficiary | Freddie Mac K-Series | Business purpose loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | 0 |  | 0 |  |
Variable Interest Entity, Primary Beneficiary | Freddie Mac K-Series | Multifamily loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | 473,514 |  | 492,221 |  |
Variable Interest Entity, Primary Beneficiary | Servicing Investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Other investments |  | 384,754 |  | 251,773 |  |
Cash and cash equivalents |  | 6,481 |  | 11,579 |  |
Restricted cash |  | 25,420 |  | 23,220 |  |
Accrued interest receivable |  | 1,462 |  | 2,334 |  |
Other assets |  | 7,177 |  | 5,723 |  |
Total Assets |  | 425,294 |  | 294,629 |  |
Short-term debt |  | 294,447 |  | 208,375 |  |
Accrued interest payable |  | 192 |  | 135 |  |
Accrued expenses and other liabilities |  | 28,115 |  | 18,353 |  |
Asset-backed securities issued |  | 0 |  | 0 |  |
Total liabilities |  | 322,754 |  | 226,863 |  |
Estimated fair value of investments |  |  |  | $ 67,766 |  |
Servicing asset, fair value |  | $ 102,540 |  |  |  |
Number of VIEs | investment |  | 3 |  | 3 |  |
Variable Interest Entity, Primary Beneficiary | Servicing Investment | Residential loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | $ 0 |  | $ 0 |  |
Variable Interest Entity, Primary Beneficiary | Servicing Investment | Business purpose loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | 0 |  | 0 |  |
Variable Interest Entity, Primary Beneficiary | Servicing Investment | Multifamily loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | 0 |  | $ 0 |  |
Variable Interest Entity, Primary Beneficiary | Point HEI |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Other investments |  | 159,553 |  |  |  |
Cash and cash equivalents |  | 0 |  |  |  |
Restricted cash |  | 5,292 |  |  |  |
Accrued interest receivable |  | 0 |  |  |  |
Other assets |  | 50 |  |  |  |
Total Assets |  | 164,895 |  |  |  |
Short-term debt |  | 0 |  |  |  |
Accrued interest payable |  | 0 |  |  |  |
Accrued expenses and other liabilities |  | 17,034 |  |  |  |
Asset-backed securities issued |  | 137,410 |  |  |  |
Total liabilities |  | 154,444 |  |  |  |
Estimated fair value of investments |  | $ 10,451 |  |  |  |
Number of VIEs | investment |  | 1 |  |  |  |
Variable Interest Entity, Primary Beneficiary | Point HEI | Residential loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | $ 0 |  |  |  |
Variable Interest Entity, Primary Beneficiary | Point HEI | Business purpose loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | 0 |  |  |  |
Variable Interest Entity, Primary Beneficiary | Point HEI | Multifamily loans, held-for-investment |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Loans, at fair value |  | $ 0 |  |  |  |
[1] | Our consolidated balance sheets include assets of consolidated variable interest entities (“VIEs”) that can only be used to settle obligations of these VIEs and liabilities of consolidated VIEs for which creditors do not have recourse to Redwood Trust, Inc. or its affiliates. At December 31, 2021 and 2020, assets of consolidated VIEs totaled $10,661,081 and $8,141,069, respectively. At December 31, 2021 and 2020, liabilities of consolidated VIEs totaled $9,619,347 and $7,148,414, respectively. See Note 4 for further discussion.

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