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Fair Value of Financial Instruments - Market Valuation Adjustments, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Market Valuation Gains (Losses), Net	$ 24,069	$ 51,484	$ (12,917)
Mortgage Banking Activities, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	57,000	51,844	36,445
Mortgage Banking Activities, Net | Residential Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	23,144	31,493	5,786
Mortgage Banking Activities, Net | Single-family rental loans held-for-sale, at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	453	0	0
Mortgage Banking Activities, Net | Loan purchase commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(1,336)	37,880	25,613
Mortgage Banking Activities, Net | Commercial loans, at fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	0	0	433
Mortgage Banking Activities, Net | Sequoia securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	0	0	1,455
Mortgage Banking Activities, Net | Risk management derivatives, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	34,739	(17,529)	3,158
Investment Fair Value Changes, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(25,689)	10,374	(28,574)
Investment Fair Value Changes, Net | Risk management derivatives, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	9,740	(12,842)	(9,112)
Investment Fair Value Changes, Net | Residential loans, held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(29,573)	(5,765)	(23,102)
Investment Fair Value Changes, Net | Residential bridge loans held-for-investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(29)	0	0
Investment Fair Value Changes, Net | Trading securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(8,055)	39,526	9,666
Investment Fair Value Changes, Net | Commercial loans held-for-sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	0	300	(307)
Investment Fair Value Changes, Net | Servicer advance investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(701)	0	0
Investment Fair Value Changes, Net | Excess MSRs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	1,823	0	0
Investment Fair Value Changes, Net | Legacy Sequoia
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(1,016)	(8,027)	(4,200)
Investment Fair Value Changes, Net | Sequoia Choice
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	443	(323)	0
Investment Fair Value Changes, Net | Freddie Mac SLST
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	1,271	0	0
Investment Fair Value Changes, Net | Freddie Mac K-Series
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	931	0	0
Investment Fair Value Changes, Net | Risk-sharing investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(434)	(1,484)	(1,151)
Investment Fair Value Changes, Net | Impairments on AFS securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value of assets	(89)	(1,011)	(368)
Other Income, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights income (loss), net	(7,242)	(10,734)	(20,788)
Other Income, Net | Risk management derivatives, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights income (loss), net	(4,734)	(568)	15,584
Other Income, Net | MSRs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage servicing rights income (loss), net	$ (2,508)	$ (10,166)	$ (36,372)

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