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Fair Value of Financial Instruments - Market Valuation Adjustments, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights income (loss), net	$ 3,770	$ 3,549	$ 12,834	$ (6,545)
Total Market Valuation Gains (Losses), Net	16,346	(19,067)	(9,238)	(40,546)
Mortgage Banking Activities, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market valuations gains and losses, net	9,384	47	24,063	7,160
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	650	11,010	11,948	9,892
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	12,021	25,173	35,508	44,482
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	3,974	433	10,819
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	0	1,455	(14,359)
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	(3,287)	(40,110)	(25,281)	(43,674)
Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market valuations gains and losses, net	11,918	(14,169)	(18,686)	(17,105)
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	(255)	(500)	(2,086)	(2,277)
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	4,222	(12,638)	(41,188)	(16,386)
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	(655)	9,077	22,161	5,170
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	8,898	(8,784)	3,728	(1,587)
Investment Fair Value Changes, Net | Commercial loans, held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market valuations gains and losses, net	(307)	0	(307)	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	15	(1,098)	(689)	(1,799)
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	(226)	(305)	(226)
MSR Income (Loss), Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights income (loss), net	(4,956)	(4,945)	(14,615)	(30,601)
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 (loss), net	(6,336)	23,551	55,874	1,736
MSR Income (Loss), Net | MSRs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights income (loss), net	$ 1,380	$ (28,496)	$ (70,489)	$ (32,337)

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