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Fair Value of Financial Instruments - Market Valuation Adjustments, Net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage servicing rights income, net $ 957 $ 1,713
Total Market Valuation Gains, Net 25,600 15,129
Mortgage Banking Activities, Net    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net 26,238 17,397
Mortgage Banking Activities, Net | Residential Loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net 4,774 8,532
Mortgage Banking Activities, Net | Residential loan purchase and forward sale commitments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net (6,968) 10,265
Mortgage Banking Activities, Net | Risk management derivatives, net    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net 28,432 (1,400)
Investment Fair Value Changes, Net    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net 1,609 1,551
Investment Fair Value Changes, Net | Risk management derivatives, net    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net 43,782 (5,127)
Investment Fair Value Changes, Net | Residential loans held-for-investment, at Redwood    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net (38,985) (2,333)
Investment Fair Value Changes, Net | Trading securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net (2,955) 11,143
Investment Fair Value Changes, Net | Legacy Sequoia    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net (8) (1,810)
Investment Fair Value Changes, Net | Sequoia Choice    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net (86) 0
Investment Fair Value Changes, Net | Risk-sharing investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net (139) (205)
Investment Fair Value Changes, Net | Impairments on AFS securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Market valuations gains and losses, net 0 (117)
MSR Income (Loss), Net    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage servicing rights income, net (2,247) (3,819)
MSR Income (Loss), Net | Risk management derivatives, net    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage servicing rights income, net (5,139) (749)
MSR Income (Loss), Net | MSRs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage servicing rights income, net $ 2,892 $ (3,070)