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Residential Loans - Additional Information (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
loan
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
loan
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
loan
Mortgage Loans on Real Estate [Line Items]          
Loan market valuation adjustment $ 4,184,920,000   $ 4,184,920,000   $ 3,888,051,000
Transfers from loans held-for-sale to loans held-for-investment     643,876,000 $ 877,744,000  
Transfers from loans held-for-investment to loans held-for-sale     $ 98,853,000 359,005,000  
Fixed-rate loans          
Mortgage Loans on Real Estate [Line Items]          
Weighted average coupon rate (as a percent) 4.08%   4.08%    
Redwood          
Mortgage Loans on Real Estate [Line Items]          
Loan market valuation adjustment $ 3,194,483,000   $ 3,194,483,000   3,096,415,000
Legacy Sequoia          
Mortgage Loans on Real Estate [Line Items]          
Loan market valuation adjustment 673,134,000   673,134,000   791,636,000
Sequoia Choice          
Mortgage Loans on Real Estate [Line Items]          
Loan market valuation adjustment 317,303,000   317,303,000   0
Residential loans          
Mortgage Loans on Real Estate [Line Items]          
Loan pledged as collateral 493,000,000   493,000,000   $ 534,000,000
Held-for-sale residential loans | FHLB Chicago          
Mortgage Loans on Real Estate [Line Items]          
Loans pledged as collateral under borrowing agreement with FHLBC 2,260,000,000   $ 2,260,000,000    
Residential Loans          
Mortgage Loans on Real Estate [Line Items]          
Number of loans (in loans) | loan     1,233   1,114
Loan Principal 900,000,000   $ 900,000,000   $ 830,000,000
Loan market valuation adjustment 920,000,000   920,000,000   830,000,000
Principal value of loans purchased 1,430,000,000 $ 1,220,000,000 3,720,000,000 3,730,000,000  
Principal balance of loans sold during period 1,050,000,000 760,000,000 3,080,000,000 2,800,000,000  
Gain (loss) on assets measured at fair value on a non-recurring basis 15,000,000 1,000,000 29,000,000 12,000,000  
Loans held-for-investment, in foreclosure 1,000,000   1,000,000    
Residential Loans | Jumbo Loans | Held-for-sale residential loans          
Mortgage Loans on Real Estate [Line Items]          
Loan market valuation adjustment 924,594,000   924,594,000   834,193,000
Residential Loans | Jumbo Loans | Redwood | Held-for-sale residential loans          
Mortgage Loans on Real Estate [Line Items]          
Loan market valuation adjustment 924,594,000   924,594,000   834,193,000
Residential Loans | Jumbo Loans | Legacy Sequoia | Held-for-sale residential loans          
Mortgage Loans on Real Estate [Line Items]          
Loan market valuation adjustment 0   0   0
Residential Loans | Jumbo Loans | Sequoia Choice | Held-for-sale residential loans          
Mortgage Loans on Real Estate [Line Items]          
Loan market valuation adjustment $ 0   $ 0   $ 0
Residential Loans | Financing Receivables, Equal to Greater than 90 Days Past Due          
Mortgage Loans on Real Estate [Line Items]          
Number of loans past due (in loans) | loan 0   0   0
Residential loans, at lower of cost or fair value          
Mortgage Loans on Real Estate [Line Items]          
Number of loans (in loans) | loan     6   7
Loan Principal $ 1,000,000   $ 1,000,000   $ 2,000,000
Loan market valuation adjustment $ 1,000,000   $ 1,000,000   1,000,000
Number of loans in foreclosure (in loans) | loan 0   0    
Residential loans, at lower of cost or fair value | Held-for-sale residential loans          
Mortgage Loans on Real Estate [Line Items]          
Loan market valuation adjustment $ 1,087,000   $ 1,087,000   1,206,000
Residential loans, at lower of cost or fair value | Redwood | Held-for-sale residential loans          
Mortgage Loans on Real Estate [Line Items]          
Loan market valuation adjustment 1,087,000   1,087,000   1,206,000
Residential loans, at lower of cost or fair value | Legacy Sequoia | Held-for-sale residential loans          
Mortgage Loans on Real Estate [Line Items]          
Loan market valuation adjustment 0   0   0
Residential loans, at lower of cost or fair value | Sequoia Choice | Held-for-sale residential loans          
Mortgage Loans on Real Estate [Line Items]          
Loan market valuation adjustment $ 0   $ 0   $ 0
Residential loans, at lower of cost or fair value | Financing Receivables, Equal to Greater than 90 Days Past Due          
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 $ 300,000   $ 300,000   $ 300,000
Residential Loans Held For Investment at Fair Value          
Mortgage Loans on Real Estate [Line Items]          
Number of loans (in loans) | loan     3,081   3,068
Loan Principal 2,230,000,000   $ 2,230,000,000   $ 2,230,000,000
Loan market valuation adjustment         $ 2,260,000,000
Gain (loss) on assets measured at fair value on a non-recurring basis 3,000,000 (1,000,000) 9,000,000 22,000,000  
Number of loans in foreclosure (in loans) | loan         0
Transfers from loans held-for-sale to loans held-for-investment 78,000,000 152,000,000 326,000,000 878,000,000  
Transfers from loans held-for-investment to loans held-for-sale $ 98,000,000 0 $ 500,000 56,000,000  
Weighted average original Fair Isaac Corporation (FICO) score 772   772    
Weighted average original loan-to-value (LTV) (as a percent) 65.00%   65.00%    
Percentage of fixed-rate loans (as a percent) 94.00%   94.00%    
Residential Loans Held For Investment at Fair Value | Originated Between 2013 and 2017          
Mortgage Loans on Real Estate [Line Items]          
Percentage of loan portfolio originated in year (as a percent) 95.00%   95.00%    
Residential Loans Held For Investment at Fair Value | Originated 2012 and prior years          
Mortgage Loans on Real Estate [Line Items]          
Percentage of loan portfolio originated in year (as a percent) 5.00%   5.00%    
Residential Loans Held For Investment at Fair Value | Hybrid loans          
Mortgage Loans on Real Estate [Line Items]          
Weighted average coupon rate (as a percent) 4.00%   4.00%    
Residential Loans Held For Investment at Fair Value | Legacy Sequoia          
Mortgage Loans on Real Estate [Line Items]          
Number of loans (in loans) | loan     3,308   3,735
Loan Principal $ 738,000,000   $ 738,000,000   $ 887,000,000
Loan market valuation adjustment 673,000,000   673,000,000   792,000,000
Loans held-for-investment, delinquent greater than 90 days $ 14,000,000   $ 14,000,000   19,000,000
Weighted average original Fair Isaac Corporation (FICO) score 728   728    
Weighted average original loan-to-value (LTV) (as a percent) 66.00%   66.00%    
Loans held-for-investment, in foreclosure $ 12,000,000   $ 12,000,000   $ 11,000,000
Valuation adjustment gain (loss) 4,000,000 $ 9,000,000 $ 24,000,000 $ (19,000,000)  
Residential Loans Held For Investment at Fair Value | Sequoia Choice          
Mortgage Loans on Real Estate [Line Items]          
Number of loans (in loans) | loan     409   0
Loan Principal 308,000,000   $ 308,000,000    
Loan market valuation adjustment 317,000,000   317,000,000    
Loans held-for-investment, delinquent greater than 90 days 0   0    
Transfers from loans held-for-investment to loans held-for-sale $ 318,000,000   $ 318,000,000    
Weighted average original Fair Isaac Corporation (FICO) score 744   744    
Weighted average original loan-to-value (LTV) (as a percent) 75.00%   75.00%    
Valuation adjustment gain (loss) $ (1,000,000)   $ (1,000,000)    
Residential Loans Held For Investment at Fair Value | Jumbo Loans | Held-for-sale residential loans          
Mortgage Loans on Real Estate [Line Items]          
Loan market valuation adjustment 3,259,239,000   3,259,239,000   $ 3,052,652,000
Residential Loans Held For Investment at Fair Value | Jumbo Loans | Redwood | Held-for-sale residential loans          
Mortgage Loans on Real Estate [Line Items]          
Loan market valuation adjustment 2,268,802,000   2,268,802,000   2,261,016,000
Residential Loans Held For Investment at Fair Value | Jumbo Loans | Legacy Sequoia | Held-for-sale residential loans          
Mortgage Loans on Real Estate [Line Items]          
Loan market valuation adjustment 673,134,000   673,134,000   791,636,000
Residential Loans Held For Investment at Fair Value | Jumbo Loans | Sequoia Choice | Held-for-sale residential loans          
Mortgage Loans on Real Estate [Line Items]          
Loan market valuation adjustment $ 317,303,000   $ 317,303,000   0
Residential Loans Held For Investment at Fair Value | Financing Receivables, Equal to Greater than 90 Days Past Due          
Mortgage Loans on Real Estate [Line Items]          
Loan Principal         $ 200,000
Number of loans past due (in loans) | loan 0   0   1
MSRs          
Mortgage Loans on Real Estate [Line Items]          
Mortgage servicing rights, at amortized cost $ 2,410,000,000   $ 2,410,000,000