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Schedule IV - Mortgage Loans On Real Estate (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) loan | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) tranche | Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Carrying Amount | $ 12,856,934,000 | $ 12,856,934,000 | $ 12,856,934,000 | $ 8,877,626,000 | $ 15,630,117,000 | $ 9,540,598,000
Residential loans, held-for-investment |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Carrying Amount | 5,747,150,000 | 5,747,150,000 | 5,747,150,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | 235,567,000 | 235,567,000 | $ 235,567,000 |  |  |
Residential loans, held-for-sale, at fair value |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Number of Loans |  |  | 2,196 | 198 |  |
Carrying Amount | 1,845,282,000 | 1,845,282,000 | $ 1,845,282,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 2,923,000 | 2,923,000 | $ 2,923,000 | $ 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 | 57 |  | 57 | 2 |  |
Carrying Amount | $ 52,532,000 | 52,532,000 | $ 52,532,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 0 | $ 0 | $ 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 |  | 1.88% |  |  |  |
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 |  | 4.00% |  |  |  |
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 | 2,139 |  | 2,139 | 196 |  |
Carrying Amount | $ 1,792,750,000 | $ 1,792,750,000 | $ 1,792,750,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | 2,923,000 | $ 2,923,000 | 2,923,000 | $ 1,882,000 |  |
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 |  | 2.50% |  |  |  |
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 |  | 5.88% |  |  |  |
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 | 358,309,000 | $ 358,309,000 | 358,309,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 5,384,000 | 5,384,000 | 5,384,000 |  |  |
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 | 245 |  |  |  |  |
Carrying Amount | $ 358,309,000 | 358,309,000 | 358,309,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | 5,384,000 | $ 5,384,000 | 5,384,000 |  |  |
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 |  | 3.38% |  |  |  |
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 | 3,488,074,000 | $ 3,488,074,000 | 3,488,074,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | 41,998,000 | 41,998,000 | 41,998,000 |  |  |
Bridge loans held-for-investment |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Carrying Amount | 666,364,000 | 666,364,000 | 666,364,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | 18,031,000 | 18,031,000 | 18,031,000 |  |  |
Real estate loans, federal income tax basis | $ 950,000,000 | 950,000,000 | 950,000,000 |  |  |
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 | 187 |  |  |  |  |
Carrying Amount | $ 91,580,000 | 91,580,000 | 91,580,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 17,115,000 | $ 17,115,000 | 17,115,000 |  |  |
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 |  | 5.45% |  |  |  |
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 |  | 12.00% |  |  |  |
Bridge loans held-for-investment | Floating ARM Loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Number of Loans | loan | 947 |  |  |  |  |
Carrying Amount | $ 574,784,000 | $ 574,784,000 | 574,784,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | 916,000 | $ 916,000 | 916,000 |  |  |
Bridge loans held-for-investment | Floating ARM Loans | Minimum |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Interest Rate |  | 4.25% |  |  |  |
Bridge loans held-for-investment | Floating ARM Loans | Maximum |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Interest Rate |  | 10.00% |  |  |  |
Multifamily loans, held-for-investment |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Carrying Amount | 473,514,000 | $ 473,514,000 | 473,514,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 0 | 0 | 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 | $ 473,514,000 | 473,514,000 | 473,514,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | 0 | $ 0 | 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% |  |  |  |
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 | $ 0 | 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 | 1,583 |  |  | 1,908 |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 7,482,000 | 7,482,000 | 7,482,000 | $ 17,285,000 |  |
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 | 1,574 |  |  | 1,899 |  |
Carrying Amount | $ 227,302,000 | 227,302,000 | 227,302,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 7,482,000 | $ 7,482,000 | 7,482,000 | $ 17,285,000 |  |
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 |  |  | 9 |  |
Carrying Amount | $ 3,153,000 | $ 3,153,000 | 3,153,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 0 | $ 0 | 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 |  | 2.50% |  |  |  |
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 |  | 2.63% |  |  |  |
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 | 4,300 |  |  | 2,177 |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 15,124,000 | $ 15,124,000 | 15,124,000 | $ 74,742,000 |  |
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 | 28 |  |  | 54 |  |
Carrying Amount | $ 21,855,000 | 21,855,000 | 21,855,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 0 | $ 0 | 0 | $ 2,415,000 |  |
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 |  | 3.13% |  |  |  |
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 |  | 6.75% |  |  |  |
Sequoia | 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 | 4,272 |  |  | 2,123 |  |
Carrying Amount | $ 3,606,610,000 | $ 3,606,610,000 | 3,606,610,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | 15,124,000 | $ 15,124,000 | 15,124,000 | $ 72,327,000 |  |
Sequoia | 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 |  | 1.88% |  |  |  |
Sequoia | 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(1) |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Real estate loans, federal income tax basis | $ 0 | $ 0 | 0 |  |  |
Freddie Mac SLST(1) | 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 | 11,986 |  |  | 13,605 |  |
Carrying Amount | $ 1,888,230,000 | 1,888,230,000 | 1,888,230,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 212,961,000 | $ 212,961,000 | 212,961,000 | $ 389,245,000 |  |
Freddie Mac SLST(1) | 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(1) | 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(1) | 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 | 1,173 |  |  |  |  |
Carrying Amount | $ 3,488,074,000 | $ 3,488,074,000 | 3,488,074,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | 41,998,000 | $ 41,998,000 | 41,998,000 |  |  |
CAFL(1) | 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 |  | 3.81% |  |  |  |
CAFL(1) | 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% |  |  |  |
CAFL(1) | Bridge loans held-for-investment |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Carrying Amount | 278,242,000 | $ 278,242,000 | 278,242,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 0 | 0 | 0 |  |  |
CAFL(1) | 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 | 920 |  |  |  |  |
Carrying Amount | $ 137,671,000 | 137,671,000 | 137,671,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 0 | $ 0 | 0 |  |  |
CAFL(1) | 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 |  | 5.45% |  |  |  |
CAFL(1) | 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 |  | 10.65% |  |  |  |
CAFL(1) | Bridge loans held-for-investment | Floating ARM Loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Number of Loans | loan | 720 |  |  |  |  |
Carrying Amount | $ 140,571,000 | $ 140,571,000 | 140,571,000 |  |  |
Principal Amount Subject to Delinquent Principal or Interest | $ 0 | $ 0 | $ 0 |  |  |
CAFL(1) | Bridge loans held-for-investment | Floating ARM Loans | Minimum |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Interest Rate |  | 5.75% |  |  |  |
CAFL(1) | Bridge loans held-for-investment | Floating ARM Loans | Maximum |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Interest Rate |  | 10.50% |  |  |  |

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