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Business Purpose Loans - Classifications and Carrying Values of Business Purpose Residential Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Residential Bridge, Held-for-sale at fair value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, at fair value | $ 0 | $ 0
Bridge loans held-for-investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, at fair value | 666,364 | 641,765
Bridge loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, at fair value | 666,364 | 641,765
Held-for-sale at fair value, Total |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, at fair value | 358,309 | 245,394
Held-for-investment at fair value, Total |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, at fair value | 4,432,680 | 3,890,959
Business Purpose Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, at fair value | 4,790,989 | 4,136,353
Redwood | Single-family rental loans, held-for-sale |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, at fair value | 358,309 | 245,394
Redwood | Single-family rental loans held-for-investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, at fair value | 0 | 0
Redwood | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, at fair value | 358,309 | 245,394
CoreVest LLC | Single-family rental loans, held-for-sale |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, at fair value | 0 | 0
CoreVest LLC | Single-family rental loans held-for-investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, at fair value | 3,488,074 | 3,249,194
CoreVest LLC | Single-family rental loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, at fair value | 3,488,074 | 3,249,194
CoreVest LLC | Bridge Loans, Held-For-Sale At Fair Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, at fair value | 0 | 0
CoreVest LLC | Bridge Loans Held For Investment At Fair Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, at fair value | 278,242 | 0
CoreVest LLC | Bridge Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, at fair value | $ 278,242 | $ 0

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