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Schedule IV - Mortgage Loans On Real Estate (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 198 | 669 |  |
Carrying Amount | $ 8,877,626,000 | $ 15,630,117,000 | $ 9,540,598,000 | $ 5,115,210,000
Principal Amount Subject to Delinquent Principal or Interest | 1,882,000 | $ 747,000 |  |
Residential loans, held-for-investment |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Carrying Amount | 4,072,410,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | 481,272,000 |  |  |
Residential loans, held-for-sale, at fair value |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Carrying Amount | 176,641,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 1,882,000 |  |  |
Residential loans, held-for-sale, at fair value | Hybrid ARM loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 2 | 115 |  |
Carrying Amount | $ 1,014,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 0 | $ 0 |  |
Residential loans, held-for-sale, at fair value | Hybrid ARM loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 2.00% |  |  |
Residential loans, held-for-sale, at fair value | Hybrid ARM loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 4.38% |  |  |
Residential loans, held-for-sale, at fair value | Fixed loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 196 | 554 |  |
Carrying Amount | $ 175,627,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 1,882,000 | $ 747,000 |  |
Residential loans, held-for-sale, at fair value | Fixed loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 2.38% |  |  |
Residential loans, held-for-sale, at fair value | Fixed loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 5.50% |  |  |
Single-family rental loans, held-for-sale |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Carrying Amount | $ 245,394,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 7,127,000 |  |  |
Single-family rental loans, held-for-sale | Fixed loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 65 |  |  |
Carrying Amount | $ 245,394,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 7,127,000 |  |  |
Single-family rental loans, held-for-sale | Fixed loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 3.82% |  |  |
Single-family rental loans, held-for-sale | Fixed loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 7.75% |  |  |
Single-family rental loans held-for-investment |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Carrying Amount | $ 3,249,194,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | 61,440,000 |  |  |
Bridge loans held-for-investment |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Carrying Amount | 641,765,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | 39,415,000 |  |  |
Real estate loans, federal income tax basis | $ 654,000,000 |  |  |
Bridge loans held-for-investment | Fixed loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 1,725 |  |  |
Carrying Amount | $ 641,765,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 39,415,000 |  |  |
Bridge loans held-for-investment | Fixed loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 6.04% |  |  |
Bridge loans held-for-investment | Fixed loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 13.00% |  |  |
Multifamily loans, held-for-investment |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Carrying Amount | $ 492,221,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 0 |  |  |
Multifamily loans, held-for-investment | Fixed loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 28 |  |  |
Carrying Amount | $ 492,221,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 0 |  |  |
Multifamily loans, held-for-investment | Fixed loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 4.25% |  |  |
Multifamily loans, held-for-investment | Fixed loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 4.25% |  |  |
Redwood | Residential loans, held-for-investment |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan |  | 2,940 |  |
Principal Amount Subject to Delinquent Principal or Interest |  | $ 1,585,000 |  |
Redwood | Residential loans, held-for-investment | Hybrid ARM loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan |  | 299 |  |
Principal Amount Subject to Delinquent Principal or Interest |  | $ 971,000 |  |
Redwood | Residential loans, held-for-investment | Fixed loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan |  | 2,641 |  |
Principal Amount Subject to Delinquent Principal or Interest |  | $ 614,000 |  |
Legacy Sequoia |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Real estate loans, federal income tax basis | $ 0 |  |  |
Legacy Sequoia | Residential loans, held-for-investment |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 1,908 | 2,198 |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 17,285,000 | $ 9,803,000 |  |
Legacy Sequoia | Residential loans, held-for-investment | ARM loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 1,899 | 2,186 |  |
Carrying Amount | $ 282,551,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 17,285,000 | $ 9,803,000 |  |
Legacy Sequoia | Residential loans, held-for-investment | ARM loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 0.25% |  |  |
Legacy Sequoia | Residential loans, held-for-investment | ARM loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 5.63% |  |  |
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 9 | 12 |  |
Carrying Amount | $ 3,384,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 0 | $ 0 |  |
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 2.63% |  |  |
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 4.00% |  |  |
Sequoia Choice | Residential loans, held-for-investment |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 2,177 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 74,742,000 |  |  |
Sequoia Choice | Residential loans, held-for-investment | Hybrid ARM loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 54 |  |  |
Carrying Amount | $ 43,003,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 2,415,000 |  |  |
Sequoia Choice | Residential loans, held-for-investment | Hybrid ARM loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 3.13% |  |  |
Sequoia Choice | Residential loans, held-for-investment | Hybrid ARM loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 6.75% |  |  |
Sequoia Choice | Residential loans, held-for-investment | Fixed loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 2,123 | 3,156 |  |
Carrying Amount | $ 1,522,319,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 72,327,000 | $ 6,755,000 |  |
Sequoia Choice | Residential loans, held-for-investment | Fixed loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 2.75% |  |  |
Sequoia Choice | Residential loans, held-for-investment | Fixed loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 6.75% |  |  |
Freddie Mac SLST |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Real estate loans, federal income tax basis | $ 0 |  |  |
Freddie Mac SLST | Residential loans, held-for-investment | Fixed loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 13,605 | 14,502 |  |
Carrying Amount | $ 2,221,153,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 389,245,000 | $ 135,175,000 |  |
Freddie Mac SLST | Residential loans, held-for-investment | Fixed loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 2.00% |  |  |
Freddie Mac SLST | Residential loans, held-for-investment | Fixed loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 11.00% |  |  |
CAFL | Single-family rental loans held-for-investment | Fixed loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 1,094 |  |  |
Carrying Amount | $ 3,249,194,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 61,440,000 |  |  |
CAFL | Single-family rental loans held-for-investment | Fixed loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 3.93% |  |  |
CAFL | Single-family rental loans held-for-investment | Fixed loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 7.57% |  |  |

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