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Business Purpose Loans - Activity and Characteristics of Business Purpose Loans (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Purchases of held-for-sale loans | $ 4,431,468 | $ 5,823,547 | $ 7,162,131
Principal balance of loans sold to third parties | 27,210 | 84,303 | 84,495
Transfers from loans held-for-sale to loans held-for-investment | $ 1,868,656 | 1,801,560 | 2,062,809
Number of loans transferred | loan | 5 |  |
Transfers from residential loans to real estate owned | $ 14,229 | $ 8,609 | $ 4,104
Number of Loans | loan | 198 | 669 |
Principal amount outstanding on loans securitized | $ 172,748 | $ 524,928 |
Commitment To Fund Residential Bridge Loan |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Other commitment | $ 216,000 |  |
Single-family rental loans, held-for-sale |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 65 | 201 |
Principal amount outstanding on loans securitized | $ 234,475 | $ 321,637 |
Single-family rental loans, held-for-sale | Redwood |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Purchases of held-for-sale loans | 979,696 | 513,725 |
Principal balance of loans sold to third parties | (110,836) | 20,426 |
Transfers from loans held-for-sale to loans held-for-investment | 1,292,633 | 717,934 |
Gain (loss) on investments | (20,806) | 272 |
Loans, at fair value | 245,394 | 331,565 |
Single-family rental loans, held-for-sale | Redwood | Business Purpose Mortgage Banking Activities |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Gain (loss) on investments | 81,032 | 13,363 |
Single-family rental loans, held-for-sale | CAFL |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Transfers from loans held-for-sale to loans held-for-investment | $ 1,290,000 | $ 394,000 |
Number of securitization entities to which asset transferred | loan | 5 | 1 |
Single-family rental loans held-for-investment | Redwood |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan |  | 107 |
Principal amount outstanding on loans securitized |  | $ 231,211 |
Loans, at fair value | $ 0 | 237,620 |
Single-family rental loans held-for-investment | CAFL |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Gain (loss) on investments | $ 32,331 | $ (14,681) |
Number of Loans | loan | 1,094 | 783 |
Principal amount outstanding on loans securitized | $ 3,017,137 | $ 2,078,214 |
Loans, at fair value | $ 3,249,194 | $ 2,192,552 |
Weighted average coupon rate | 5.44% | 5.70% |
Contract maturities | 5 years | 7 years |
Loans held as assets, 90 days or more past due | $ 24,745 | $ 9,169 |
Number of loans in foreclosure | loan | 10 | 5 |
Single-family rental loans held-for-investment | CAFL | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Number of loans past due | loan | 22 | 18 |
Loans held as assets, 90 days or more past due | $ 61,440 | $ 29,039 |
Bridge loans held-for-investment |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Purchases of held-for-sale loans | 451,554 | 501,355 |
Principal balance of loans sold to third parties | (25,151) | 56,484 |
Gain (loss) on investments | (10,629) | $ (2,139) |
Transfers from residential loans to real estate owned | $ 6,000 |  |
Number of Loans | loan | 1,725 | 2,653 |
Principal amount outstanding on loans securitized | $ 649,532 | $ 741,232 |
Loans, at fair value | $ 641,765 | 745,006 |
Bridge loans held-for-investment | Minimum |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Original maturity (in months) | 6 months |  |
Bridge loans held-for-investment | Maximum |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Original maturity (in months) | 24 months |  |
Bridge loans held-for-investment | Business Purpose Mortgage Banking Activities |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Gain (loss) on investments | $ (2,916) | 3,342 |
Business Purpose Loans |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Fee income | 19,000 | 16,000 |
Loans, at fair value | $ 4,136,353 | $ 3,506,743 |
Single-Family Rental Loans, Held-For-Sale | Redwood |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 65 | 308 |
Principal amount outstanding on loans securitized | $ 234,475 | $ 552,848 |
Loans, at fair value | $ 245,394 | $ 569,185 |
Weighted average coupon rate | 4.84% | 4.96% |
Contract maturities | 8 years | 9 years |
Loans held as assets, 90 days or more past due | $ 0 | $ 130 |
Number of loans in foreclosure | loan | 0 | 1 |
Loans held as assets amount in foreclosure | $ 0 | $ 130 |
Single-Family Rental Loans, Held-For-Sale | Redwood | Loans Pledged As Collateral, Short Term Debt |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Gain (loss) on investments | 34,098 | $ 504,237 |
Single-Family Rental Loans, Held-For-Sale | Redwood | Loans Pledged As Collateral, Long Term debt |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Gain (loss) on investments | $ 154,774 |  |
Single-Family Rental Loans, Held-For-Sale | Redwood | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Number of loans past due | loan | 10 | 2 |
Loans held as assets, 90 days or more past due | $ 7,127 | $ 1,818 |
Loans past due | $ 6,143 | $ 1,818 |
Business Purpose Bridge Loans |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 1,725 | 2,653 |
Principal amount outstanding on loans securitized | $ 649,532 | $ 742,528 |
Loans, at fair value | $ 641,765 | $ 745,006 |
Weighted average coupon rate | 8.09% | 8.11% |
Contract maturities | 1 year | 2 years |
Loans held as assets, 90 days or more past due | $ 38,552 | $ 14,186 |
Number of loans in foreclosure | loan | 25 | 31 |
Loans held as assets amount in foreclosure | $ 33,066 | $ 12,111 |
Business Purpose Bridge Loans | Loans Pledged As Collateral, Short Term Debt |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Gain (loss) on investments | 92,931 | $ 694,964 |
Business Purpose Bridge Loans | Loans Pledged As Collateral, Long Term debt |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Gain (loss) on investments | $ 544,151 |  |
Business Purpose Bridge Loans | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Number of loans past due | loan | 31 | 15 |
Loans held as assets, 90 days or more past due | $ 39,415 | $ 8,987 |
Loans past due | $ 33,605 | $ 6,917 |

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