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Business Purpose Residential Loans - Geographic Concentration of Business Purpose Loans (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
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 | Florida |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 5.00% | 69.00%
Single-family rental loans, held-for-sale at fair value | Texas |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 19.00% | 14.00%
Single-family rental loans, held-for-sale at fair value | New Jersey |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 12.00% |
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% |
Single-family rental loans, held-for-sale at fair value | California |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 2.00% | 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% | 0.00%
Single-family rental loans, held-for-sale at fair value | Georgia |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 8.00% |
Single-family rental loans, held-for-sale at fair value | Alabama |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 5.00% |
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 | Illinois |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 1.00% |
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 | 31.00% | 17.00%
Residential bridge loans held-for-investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
Residential bridge loans held-for-investment | Florida |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 9.00% | 7.00%
Residential bridge loans held-for-investment | Texas |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 3.00% | 0.00%
Residential bridge loans held-for-investment | New Jersey |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 8.00% |
Residential bridge loans held-for-investment | New York |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 6.00% |
Residential bridge loans held-for-investment | California |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 21.00% | 79.00%
Residential bridge loans held-for-investment | Utah |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 5.00% | 5.00%
Residential bridge loans held-for-investment | Georgia |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 7.00% |
Residential bridge loans held-for-investment | Alabama |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 4.00% |
Residential bridge loans held-for-investment | Arkansas |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.00% |
Residential bridge loans held-for-investment | Maryland |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.00% |
Residential bridge loans held-for-investment | Illinois |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 3.00% |
Residential bridge loans held-for-investment | Other states (none greater than 5%) |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 34.00% | 9.00%
Redwood | Single-family rental loans held-for-investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 100.00% | 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 | Texas |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 12.00% | 0.00%
Redwood | Single-family rental loans held-for-investment | New Jersey |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 5.00% |
Redwood | Single-family rental loans held-for-investment | New York |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 1.00% |
Redwood | Single-family rental loans held-for-investment | California |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 1.00% | 0.00%
Redwood | Single-family rental loans held-for-investment | Utah |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.00% | 0.00%
Redwood | Single-family rental loans held-for-investment | Georgia |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.00% |
Redwood | Single-family rental loans held-for-investment | Alabama |  |
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 | Illinois |  |
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 | 81.00% | 0.00%
CAFL | Single-family rental loans held-for-investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 100.00% | 0.00%
CAFL | Single-family rental loans held-for-investment | Florida |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 8.00% | 0.00%
CAFL | Single-family rental loans held-for-investment | Texas |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 15.00% | 0.00%
CAFL | Single-family rental loans held-for-investment | New Jersey |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 11.00% |
CAFL | Single-family rental loans held-for-investment | New York |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 1.00% |
CAFL | Single-family rental loans held-for-investment | California |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 7.00% | 0.00%
CAFL | Single-family rental loans held-for-investment | Utah |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 0.00% | 0.00%
CAFL | Single-family rental loans held-for-investment | Georgia |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 5.00% |
CAFL | Single-family rental loans held-for-investment | Alabama |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 4.00% |
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 | Illinois |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Concentration risk percentage | 5.00% |
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 | 40.00% | 0.00%

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