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Residential Loans - Additional Information (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) loan | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) loan | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 loan
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 |  |  | $ 1,069,326,000 | $ 247,377,000 |  |
Transfers from loans held-for-investment to loans held-for-sale |  |  | 0 | 459,000 |  |
Held-for-sale residential loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Residential loans | $ 5,491,170,000 |  | 5,491,170,000 |  | $ 5,115,210,000 |
Held-for-sale residential loans | Legacy Sequoia |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Residential loans | 592,029,000 |  | 592,029,000 |  | 632,817,000 |
Held-for-sale residential loans | Sequoia Choice |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Residential loans | 1,481,145,000 |  | 1,481,145,000 |  | 620,062,000 |
Redwood | Held-for-sale residential loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Residential loans | 3,417,996,000 |  | 3,417,996,000 |  | $ 3,862,331,000 |
Redwood | Held-for-sale residential loans | FHLB Chicago |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Loans pledged as collateral under borrowing agreement with FHLBC | $ 2,310,000,000 |  | $ 2,310,000,000 |  |  |
Redwood | Fixed rate residential mortgage |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Weighted average coupon rate | 4.08% |  | 4.08% |  |  |
Residential Loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Number of loans (in loans) | loan |  |  | 1,547 |  | 2,009 |
Loan Principal | $ 1,090,000,000 |  | $ 1,090,000,000 |  | $ 1,410,000,000 |
Residential loans | 1,100,000,000 |  | 1,100,000,000 |  | 1,430,000,000 |
Loans held-for-investment, delinquent greater than 90 days |  |  |  |  | $ 500,000 |
Number of loans in foreclosure (in loans) | loan |  |  |  |  | 0 |
Principal value of loans purchased | 1,930,000,000 | $ 1,200,000,000 | 3,730,000,000 | 2,290,000,000 |  |
Principal balance of loans sold during period | 1,920,000,000 | 670,000,000 | 3,930,000,000 | 2,040,000,000 |  |
Gain (loss) on assets measured at fair value on a non-recurring basis | 6,000,000 | 6,000,000 | 11,000,000 | 14,000,000 |  |
Loan pledged as collateral | 786,000,000 |  | 786,000,000 |  |  |
Loans held-for-investment, in foreclosure | 1,000,000 |  | 1,000,000 |  |  |
Residential Loans | Jumbo Loans | Held-for-sale residential loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Residential loans | 1,104,545,000 |  | 1,104,545,000 |  | $ 1,427,052,000 |
Residential Loans | 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] |  |  |  |  |  |
Residential loans | 0 |  | 0 |  | 0 |
Residential Loans | 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] |  |  |  |  |  |
Residential loans | 0 |  | 0 |  | 0 |
Residential Loans | Jumbo Loans | Redwood | Held-for-sale residential loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Residential loans | $ 1,104,545,000 |  | $ 1,104,545,000 |  | $ 1,427,052,000 |
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 (in loans) | loan | 1 |  | 1 |  | 1 |
Loans held-for-investment, delinquent greater than 90 days | $ 600,000 |  | $ 600,000 |  |  |
Residential loans, 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 (in loans) | loan |  |  | 2 |  | 4 |
Loan Principal | 200,000 |  | $ 200,000 |  | $ 1,000,000 |
Residential loans | 100,000 |  | 100,000 |  | 1,000,000 |
Loans held-for-investment, delinquent greater than 90 days |  |  |  |  | $ 300,000 |
Number of loans in foreclosure (in loans) | loan |  |  |  |  | 0 | 0
Residential loans, at lower of cost or fair value | Held-for-sale residential loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Residential loans | 115,000 |  | 115,000 |  | $ 893,000 |
Residential loans, at lower of cost or fair value | Held-for-sale residential loans | Legacy Sequoia |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Residential loans | 0 |  | 0 |  | 0 |
Residential loans, at lower of cost or fair value | Held-for-sale residential loans | Sequoia Choice |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Residential loans | 0 |  | 0 |  | 0 |
Residential loans, at lower of cost or fair value | Redwood | Held-for-sale residential loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Residential loans | $ 115,000 |  | $ 115,000 |  | $ 893,000 |
Residential loans, 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 (in loans) | loan | 0 |  | 0 |  | 1 |
Loans held-for-investment, delinquent greater than 90 days |  |  |  |  | $ 300,000 |
Residential Loans Held For Investment at Fair Value | Legacy Sequoia |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Valuation adjustment gain (loss) | $ 4,000,000 | 11,000,000 |  | 19,000,000 |  |
Residential Loans Held For Investment at Fair Value | 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 | 530,000,000 |  |  |  |  |
Residential Loans Held For Investment at Fair Value | Legacy Sequoia |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Number of loans (in loans) | loan |  |  | 2,924 |  | 3,178 |
Loan Principal | 623,000,000 |  | $ 623,000,000 |  | $ 698,000,000 |
Residential loans | 592,000,000 |  | 592,000,000 |  | 633,000,000 |
Loans held-for-investment, delinquent greater than 90 days | 18,000,000 |  | 18,000,000 |  | $ 25,000,000 |
Weighted average original Fair Isaac Corporation (FICO) score |  |  |  |  | 728 |
Weighted average original loan-to-value (LTV) |  |  |  |  | 66.00% |
Loans held-for-investment, in foreclosure | 7,000,000 |  | 7,000,000 |  | $ 10,000,000 |
Residential Loans Held For Investment at Fair Value | Legacy Sequoia | Legacy Sequoia |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Valuation adjustment gain (loss) |  |  | $ 33,000,000 |  |  |
Residential Loans Held For Investment at Fair Value | Sequoia Choice |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Number of loans (in loans) | loan |  |  | 1,990 |  | 806 |
Loan Principal | 1,460,000,000 |  | $ 1,460,000,000 |  | $ 605,000,000 |
Residential loans | 1,480,000,000 |  | 1,480,000,000 |  | 620,000,000 |
Loans held-for-investment, delinquent greater than 90 days | 0 |  | 0 |  | $ 0 |
Weighted average original Fair Isaac Corporation (FICO) score |  |  |  |  | 743 |
Weighted average original loan-to-value (LTV) |  |  |  |  | 74.00% |
Residential Loans Held For Investment at Fair Value | 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 |  |  | $ 982,000,000 |  |  |
Residential Loans Held For Investment at Fair Value | Redwood |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Number of loans (in loans) | loan |  |  | 3,224 |  | 3,292 |
Loan Principal | $ 2,340,000,000 |  | $ 2,340,000,000 |  | $ 2,410,000,000 |
Residential loans |  |  |  |  | 2,430,000,000 |
Number of loans in foreclosure (in loans) | loan | 0 |  | 0 |  |  |
Gain (loss) on assets measured at fair value on a non-recurring basis | $ (15,000,000) | 8,000,000 | $ (54,000,000) | 6,000,000 |  |
Transfers from loans held-for-sale to loans held-for-investment | 32,000,000 | 62,000,000 | 88,000,000 | 247,000,000 |  |
Transfers from loans held-for-investment to loans held-for-sale | $ 0 | $ 500,000 | $ 0 | $ 500,000 |  |
Weighted average original Fair Isaac Corporation (FICO) score | 770 |  | 770 |  |  |
Weighted average original loan-to-value (LTV) | 66.00% |  | 66.00% |  |  |
Percentage of fixed-rate loans | 90.00% |  | 90.00% |  |  |
Residential Loans Held For Investment at Fair Value | 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 originated in year | 96.00% |  | 96.00% |  |  |
Residential Loans Held For Investment at Fair Value | Redwood | Originated 2012 and prior years |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Percentage of loan portfolio originated in year | 4.00% |  | 4.00% |  |  |
Residential Loans Held For Investment at Fair Value | Redwood | Hybrid or ARM Loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Weighted average coupon rate | 4.09% |  | 4.09% |  |  |
Residential Loans Held For Investment at Fair Value | Jumbo Loans | Held-for-sale residential loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Residential loans | $ 4,386,510,000 |  | $ 4,386,510,000 |  | 3,687,265,000 |
Residential Loans Held For Investment at Fair Value | 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] |  |  |  |  |  |
Residential loans | 592,029,000 |  | 592,029,000 |  | 632,817,000 |
Residential Loans Held For Investment at Fair Value | 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] |  |  |  |  |  |
Residential loans | 1,481,145,000 |  | 1,481,145,000 |  | 620,062,000 |
Residential Loans Held For Investment at Fair Value | Jumbo Loans | Redwood | Held-for-sale residential loans |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Residential loans | 2,313,336,000 |  | 2,313,336,000 |  | $ 2,434,386,000 |
Residential Loans Held For Investment at Fair Value | 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] |  |  |  |  |  |
Loan Principal | $ 1,000,000 |  | $ 1,000,000 |  |  |
Number of loans past due (in loans) | loan | 3 |  | 3 |  | 0 |
Number of loans in foreclosure (in loans) | loan |  |  |  |  | 0 |
MSRs |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Mortgage servicing rights, at amortized cost | $ 2,720,000,000 |  | $ 2,720,000,000 |  |  |

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