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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
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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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

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