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Fair Value of Financial Instruments - Market Valuation Adjustments, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights income, net	$ 2,778	$ 2,783	$ 4,491	$ 9,064
Total Market Valuation Gains (Losses), Net	15,614	(9,736)	30,743	(25,584)
Mortgage Banking Activities, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market valuations gains and losses, net	10,880	7,442	28,277	14,679
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	5,784	5,859	14,316	11,298
Mortgage Banking Activities, Net | Residential loan purchase commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market valuations gains and losses, net	10,406	10,852	20,671	23,487
Mortgage Banking Activities, Net | Commercial Loans at Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market valuations gains and losses, net	0	0	0	433
Mortgage Banking Activities, Net | Consolidated Sequoia entities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market valuations gains and losses, net	0	(29)	0	1,455
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	(5,310)	(9,240)	(6,710)	(21,994)
Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market valuations gains and losses, net	8,115	(11,066)	9,666	(30,604)
Investment Fair Value Changes, Net | Consolidated Sequoia entities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market valuations gains and losses, net	(987)	(251)	(2,797)	(1,831)
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	(17,838)	(9,600)	(22,965)	(45,410)
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	8,354	(647)	6,021	22,816
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	18,926	431	30,069	(5,170)
Investment Fair Value Changes, Net | Valuation adjustments on commercial loans held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market valuations gains and losses, net	300	0	300	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	(513)	(694)	(718)	(704)
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	(127)	(305)	(244)	(305)
MSR Income (Loss), Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights income, net	(3,381)	(6,112)	(7,200)	(9,659)
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	3,040	21,153	2,291	62,210
MSR Income (Loss), Net | MSRs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights income, net	$ (6,421)	$ (27,265)	$ (9,491)	$ (71,869)

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