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Residential Loans - Additional Information (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan | Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of Loans | loan |  |  | 669 | 1,484 |
Total Principal | $ 524,928,000 | $ 1,034,284,000 | $ 524,928,000 | $ 1,034,284,000 |
Transfers from loans held-for-sale to loans held-for-investment |  |  | 1,801,560,000 | 2,062,809,000 | $ 1,245,430,000
Transfers from loans held-for-investment to loans held-for-sale |  |  | 22,808,000 | 15,717,000 | $ 98,854,000
Sequoia Choice |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Loans held as assets amount in foreclosure | 0 |  | 0 |  |
Held-for sale residential loans |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Loan market valuation adjustment | 7,714,850,000 | 7,254,742,000 | 7,714,850,000 | 7,254,742,000 |
Held-for sale residential loans | Legacy Sequoia |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Loan market valuation adjustment | 407,890,000 | 519,958,000 | 407,890,000 | 519,958,000 |
Held-for sale residential loans | Sequoia Choice |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Loan market valuation adjustment | 2,291,463,000 | 2,079,382,000 | 2,291,463,000 | 2,079,382,000 |
Held-for sale residential loans | Freddie Mac SLST |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Loan market valuation adjustment | $ 2,367,215,000 | 1,222,669,000 | $ 2,367,215,000 | 1,222,669,000 |
Redwood | Fixed rate residential mortgage |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Weighted average rate on loans | 4.14% |  | 4.14% |  |
Redwood | Held-for sale residential loans |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Loan market valuation adjustment | $ 2,648,282,000 | $ 3,432,733,000 | $ 2,648,282,000 | 3,432,733,000 |
Residential Loans |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of Loans | loan | 669 | 1,484 |  |  |
Total Principal | $ 525,000,000 | $ 1,030,000,000.00 | 525,000,000 | 1,030,000,000.00 |
Loan market valuation adjustment | $ 536,000,000 | $ 1,050,000,000.00 | $ 536,000,000 | $ 1,050,000,000.00 |
Number of loans in foreclosure | loan | 0 | 0 | 0 | 0 |
Principal value |  |  | $ 5,730,000,000 | $ 7,070,000,000.00 |
Principal balance of loans sold during period |  |  | 6,070,000,000.00 | 7,110,000,000 |
Valuation adjustments |  |  | 3,000,000 | 23,000,000 |
Loan pledged as collateral | $ 201,949,000 | $ 935,132,000 | 201,949,000 | $ 935,132,000 |
Loans held as assets amount in foreclosure | $ 2,000,000 |  | $ 2,000,000 |  |
Residential 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 | 1 | 1 | 1 | 1 |
Aggregate fair value, delinquent or in foreclosure | $ 600,000 | $ 600,000 | $ 600,000 | $ 600,000 |
Loans held as assets, 90 days or more past due | $ 700,000 | $ 700,000 | 700,000 | 700,000 |
At lower of cost or fair value |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of Loans | loan |  | 2 |  |  |
Total Principal |  | $ 100,000 |  | 100,000 |
Loan market valuation adjustment |  | 100,000 |  | 100,000 |
Loans held as assets, 90 days or more past due |  | $ 0 |  | $ 0 |
Number of loans in foreclosure | loan |  | 0 |  | 0 |
At lower of cost or fair value | 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 |  | 0 |  | 0 |
Residential loans, held-for-investment | Legacy Sequoia |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Valuation adjustments |  |  | 5,000,000 |  |
Residential loans, held-for-investment | Sequoia Choice |  |  |  |  |
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 |  |  | 1,080,000,000.00 |  |
Residential loans, held-for-investment | Legacy Sequoia |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of Loans | loan | 2,198 | 2,641 |  |  |
Total Principal | $ 425,000,000 | $ 545,000,000 | 425,000,000 | $ 545,000,000 |
Loan market valuation adjustment | 408,000,000 | 520,000,000 | 408,000,000 | 520,000,000 |
Loans held as assets, 90 days or more past due | $ 10,000,000 | 14,000,000 | $ 10,000,000 | 14,000,000 |
FICO credit score | 727 |  | 727 |  |
Loan to value ratio | 65.00% |  | 65.00% |  |
Loans held as assets amount in foreclosure | $ 4,000,000 | $ 5,000,000 | $ 4,000,000 | 5,000,000 |
Valuation adjustments |  |  |  | 37,000,000 |
Residential loans, held-for-investment | Sequoia Choice |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of Loans | loan | 3,156 | 2,800 |  |  |
Total Principal | $ 2,240,000,000 | $ 2,040,000,000.00 | 2,240,000,000 | 2,040,000,000.00 |
Loan market valuation adjustment | $ 2,290,000,000 | $ 2,080,000,000.00 | $ 2,290,000,000 | $ 2,080,000,000.00 |
Number of loans in foreclosure | loan | 3 | 0 | 3 | 0 |
FICO credit score | 744 |  | 744 |  |
Loan to value ratio | 75.00% |  | 75.00% |  |
Loans held as assets amount in foreclosure | $ 2,000,000 |  | $ 2,000,000 |  |
Valuation adjustments |  |  | (15,000,000) | $ (13,000,000) |
Residential loans, held-for-investment | Sequoia Choice | Sequoia Choice |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Transfers from loans held-for-investment to loans held-for-sale |  |  |  | 1,780,000,000 |
Residential loans, held-for-investment | Freddie Mac SLST |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of Loans | loan | 14,502 | 7,900 |  |  |
Total Principal | $ 2,430,000,000 | $ 1,310,000,000 | 2,430,000,000 | 1,310,000,000 |
Loan market valuation adjustment | $ 2,370,000,000 | $ 1,220,000,000 | $ 2,370,000,000 | $ 1,220,000,000 |
Number of loans in foreclosure | loan | 208 | 0 | 208 | 0 |
FICO credit score | 600 |  | 600 |  |
Loan to value ratio | 73.00% |  | 73.00% |  |
Loans held as assets amount in foreclosure | $ 33,000,000 |  | $ 33,000,000 |  |
Valuation adjustments |  |  | 64,000,000 | $ 21,000,000 |
Residential 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 | 2,940 |  |  | 3,296 |
Total Principal | $ 2,050,000,000.00 | $ 2,390,000,000 | 2,050,000,000.00 | $ 2,390,000,000 |
Loan market valuation adjustment | $ 2,110,000,000 | $ 2,380,000,000 | $ 2,110,000,000 | $ 2,380,000,000 |
Number of loans in foreclosure | loan | 0 | 0 | 0 | 0 |
Valuation adjustments |  |  | $ 59,000,000 | $ (30,000,000) |
Transfers from loans held-for-sale to loans held-for-investment |  |  | 69,000,000 | 286,000,000 |
Transfers from loans held-for-investment to loans held-for-sale |  |  | $ 23,000,000 | 16,000,000 |
FICO credit score | 768 |  | 768 |  |
Loan to value ratio | 66.00% |  | 66.00% |  |
Percentage of loans with fixed interest rate | 89.00% |  | 89.00% |  |
Residential loans, held-for-investment | Redwood | Originated Between 2013 and 2017 |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Percentage of loan portfolio | 96.00% |  | 96.00% |  |
Residential loans, held-for-investment | Redwood | Originated In 2012 And Prior Years |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Percentage of loan portfolio | 4.00% |  | 4.00% |  |
Residential loans, held-for-investment | Redwood | Hybrid or ARM Loans |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Weighted average rate on loans | 4.16% |  | 4.16% |  |
Residential loans, held-for-investment | Jumbo Loans | Held-for sale residential loans |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Loan market valuation adjustment | $ 7,178,465,000 | $ 6,205,941,000 | $ 7,178,465,000 | 6,205,941,000 |
Residential loans, held-for-investment | Jumbo Loans | Held-for sale residential loans | Legacy Sequoia |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Loan market valuation adjustment | 407,890,000 | 519,958,000 | 407,890,000 | 519,958,000 |
Residential loans, held-for-investment | Jumbo Loans | Held-for sale residential loans | Sequoia Choice |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Loan market valuation adjustment | 2,291,463,000 | 2,079,382,000 | 2,291,463,000 | 2,079,382,000 |
Residential loans, held-for-investment | Jumbo Loans | Held-for sale residential loans | Freddie Mac SLST |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Loan market valuation adjustment | 2,367,215,000 | 1,222,669,000 | 2,367,215,000 | 1,222,669,000 |
Residential loans, held-for-investment | Jumbo Loans | Redwood | Held-for sale residential loans |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Loan market valuation adjustment | $ 2,111,897,000 | $ 2,383,932,000 | $ 2,111,897,000 | $ 2,383,932,000 |
Residential loans, held-for-investment | Financing Receivables, Equal to Greater than 90 Days Past Due | Sequoia Choice |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of loans past due | loan | 9 | 3 | 9 | 3 |
Loans held as assets, 90 days or more past due | $ 7,000,000 | $ 2,000,000 | $ 7,000,000 | $ 2,000,000 |
Residential loans, held-for-investment | Financing Receivables, Equal to Greater than 90 Days Past Due | Freddie Mac SLST |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of loans past due | loan | 587 | 306 | 587 | 306 |
Loans held as assets, 90 days or more past due | $ 135,000,000 | $ 51,000,000 | $ 135,000,000 | $ 51,000,000 |
Residential loans, held-for-investment | Financing Receivables, Equal to Greater than 90 Days Past Due | Redwood |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Total Principal | $ 1,000,000 | $ 1,000,000 | $ 1,000,000 | $ 1,000,000 |
Number of loans past due | loan | 2 | 2 | 2 | 2 |
Loans held as assets, 90 days or more past due | $ 2,000,000 |  | $ 2,000,000 |  |
MSRs |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Mortgage servicing rights | 2,030,000,000.00 |  | 2,030,000,000.00 |  |
Residential Real Estate | Redwood | Held-for sale residential loans | FHLB Chicago |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Residential mortgage loans securing FHLB advances | $ 2,100,000,000 |  | $ 2,100,000,000 |  |

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