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Business Purpose Loans - Geographic Concentration of Business Purpose Loans (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Single-family rental loans, held-for-sale at fair value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
Single-family rental loans, held-for-sale at fair value | Texas |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 24.00% | 19.00%
Single-family rental loans, held-for-sale at fair value | New Jersey |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 17.00% | 12.00%
Single-family rental loans, held-for-sale at fair value | Georgia |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 12.00% | 8.00%
Single-family rental loans, held-for-sale at fair value | Florida |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 10.00% | 5.00%
Single-family rental loans, held-for-sale at fair value | Connecticut |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 8.00% |
Single-family rental loans, held-for-sale at fair value | New York |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 5.00% | 5.00%
Single-family rental loans, held-for-sale at fair value | Arizona |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 5.00% |
Single-family rental loans, held-for-sale at fair value | California |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 5.00% | 2.00%
Single-family rental loans, held-for-sale at fair value | Illinois |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 5.00% | 1.00%
Single-family rental loans, held-for-sale at fair value | Alabama |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 2.00% | 5.00%
Single-family rental loans, held-for-sale at fair value | Indiana |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 2.00% |
Single-family rental loans, held-for-sale at fair value | Tennessee |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.00% |
Single-family rental loans, held-for-sale at fair value | Utah |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage |  | 0.00%
Single-family rental loans, held-for-sale at fair value | Arkansas |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage |  | 6.00%
Single-family rental loans, held-for-sale at fair value | Maryland |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage |  | 6.00%
Single-family rental loans, held-for-sale at fair value | Other states (none greater than 5%) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 5.00% | 31.00%
Bridge loans held-for-investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
Bridge loans held-for-investment | Texas |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 4.00% | 3.00%
Bridge loans held-for-investment | New Jersey |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 9.00% | 8.00%
Bridge loans held-for-investment | Georgia |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 8.00% | 7.00%
Bridge loans held-for-investment | Florida |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 11.00% | 9.00%
Bridge loans held-for-investment | Connecticut |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 1.00% |
Bridge loans held-for-investment | New York |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 8.00% | 6.00%
Bridge loans held-for-investment | Arizona |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 1.00% |
Bridge loans held-for-investment | California |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 13.00% | 21.00%
Bridge loans held-for-investment | Illinois |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 7.00% | 3.00%
Bridge loans held-for-investment | Alabama |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 6.00% | 4.00%
Bridge loans held-for-investment | Indiana |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 5.00% |
Bridge loans held-for-investment | Tennessee |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 6.00% |
Bridge loans held-for-investment | Utah |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage |  | 5.00%
Bridge loans held-for-investment | Arkansas |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage |  | 0.00%
Bridge loans held-for-investment | Maryland |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage |  | 0.00%
Bridge loans held-for-investment | Other states (none greater than 5%) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 21.00% | 34.00%
Redwood | Single-family rental loans held-for-investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.00% | 100.00%
Redwood | Single-family rental loans held-for-investment | Texas |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.00% | 12.00%
Redwood | Single-family rental loans held-for-investment | New Jersey |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.00% | 5.00%
Redwood | Single-family rental loans held-for-investment | Georgia |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.00% | 0.00%
Redwood | Single-family rental loans held-for-investment | Florida |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.00% | 0.00%
Redwood | Single-family rental loans held-for-investment | Connecticut |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.00% |
Redwood | Single-family rental loans held-for-investment | New York |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.00% | 1.00%
Redwood | Single-family rental loans held-for-investment | Arizona |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.00% |
Redwood | Single-family rental loans held-for-investment | California |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.00% | 1.00%
Redwood | Single-family rental loans held-for-investment | Illinois |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.00% | 0.00%
Redwood | Single-family rental loans held-for-investment | Alabama |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.00% | 0.00%
Redwood | Single-family rental loans held-for-investment | Indiana |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.00% |
Redwood | Single-family rental loans held-for-investment | Tennessee |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.00% |
Redwood | Single-family rental loans held-for-investment | Utah |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage |  | 0.00%
Redwood | Single-family rental loans held-for-investment | Arkansas |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage |  | 0.00%
Redwood | Single-family rental loans held-for-investment | Maryland |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage |  | 0.00%
Redwood | Single-family rental loans held-for-investment | Other states (none greater than 5%) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.00% | 81.00%
CAFL | Single-family rental loans held-for-investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
CAFL | Single-family rental loans held-for-investment | Texas |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 15.00% | 15.00%
CAFL | Single-family rental loans held-for-investment | New Jersey |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 11.00% | 11.00%
CAFL | Single-family rental loans held-for-investment | Georgia |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 5.00% | 5.00%
CAFL | Single-family rental loans held-for-investment | Florida |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 8.00% | 8.00%
CAFL | Single-family rental loans held-for-investment | Connecticut |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 4.00% |
CAFL | Single-family rental loans held-for-investment | New York |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 1.00% | 1.00%
CAFL | Single-family rental loans held-for-investment | Arizona |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 2.00% |
CAFL | Single-family rental loans held-for-investment | California |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 5.00% | 7.00%
CAFL | Single-family rental loans held-for-investment | Illinois |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 4.00% | 5.00%
CAFL | Single-family rental loans held-for-investment | Alabama |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 3.00% | 4.00%
CAFL | Single-family rental loans held-for-investment | Indiana |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 3.00% |
CAFL | Single-family rental loans held-for-investment | Tennessee |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 3.00% |
CAFL | Single-family rental loans held-for-investment | Utah |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage |  | 0.00%
CAFL | Single-family rental loans held-for-investment | Arkansas |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage |  | 2.00%
CAFL | Single-family rental loans held-for-investment | Maryland |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage |  | 2.00%
CAFL | Single-family rental loans held-for-investment | Other states (none greater than 5%) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 36.00% | 40.00%

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