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Fair Value of Financial Instruments - Quantitative Information about Significant Unobservable Inputs Used in Valuation of Level 3 Assets and Liabilities Measured at Fair Value (Details) $ in Thousands	Sep. 30, 2018 USD ($) $ / loan	Dec. 31, 2017 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights | $	$ 63,785	$ 63,598
ABS Issued
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued | $	$ 2,531,379
ABS Issued | Prepayment rate (annual CPR) | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.08
ABS Issued | Prepayment rate (annual CPR) | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.32
ABS Issued | Prepayment rate (annual CPR) | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.19
ABS Issued | Discount rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.03
ABS Issued | Discount rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.15
ABS Issued | Discount rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.04
ABS Issued | Default rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.00
ABS Issued | Default rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.08
ABS Issued | Default rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.02
ABS Issued | Loss severity | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.20
ABS Issued | Loss severity | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.20
ABS Issued | Loss severity | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.20
Freddie Mac K-Series
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued | $	$ 875,606
Freddie Mac K-Series | Prepayment rate (annual CPR) | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.00
Freddie Mac K-Series | Prepayment rate (annual CPR) | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.00
Freddie Mac K-Series | Prepayment rate (annual CPR) | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.00
Freddie Mac K-Series | Discount rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.03
Freddie Mac K-Series | Discount rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.09
Freddie Mac K-Series | Discount rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.04
Freddie Mac K-Series | Default rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.01
Freddie Mac K-Series | Default rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.01
Freddie Mac K-Series | Default rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.01
Freddie Mac K-Series | Loss severity | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.20
Freddie Mac K-Series | Loss severity | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.20
Freddie Mac K-Series | Loss severity | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
ABS issued, measurement input	0.20
Loan purchase commitments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan purchase commitments, net | $	$ 217
Loan purchase commitments | Whole loan spread to TBA price | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan purchase commitments, net, measurement input	2.69
Loan purchase commitments | Whole loan spread to TBA price | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan purchase commitments, net, measurement input	2.69
Loan purchase commitments | Whole loan spread to TBA price | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan purchase commitments, net, measurement input	2.69
Loan purchase commitments | Prepayment rate (annual CPR) | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan purchase commitments, net, measurement input	0.15
Loan purchase commitments | Prepayment rate (annual CPR) | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan purchase commitments, net, measurement input	0.15
Loan purchase commitments | Prepayment rate (annual CPR) | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan purchase commitments, net, measurement input	0.15
Loan purchase commitments | MSR multiple | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan purchase commitments, net, measurement input	1.0
Loan purchase commitments | MSR multiple | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan purchase commitments, net, measurement input	5.4
Loan purchase commitments | MSR multiple | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan purchase commitments, net, measurement input	3.5
Loan purchase commitments | Pull-through rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan purchase commitments, net, measurement input	0.16
Loan purchase commitments | Pull-through rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan purchase commitments, net, measurement input	1.00
Loan purchase commitments | Pull-through rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan purchase commitments, net, measurement input	0.72
Loan purchase commitments | Whole loan spread to swap rate - fixed rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan purchase commitments, net, measurement input	0.90
Loan purchase commitments | Whole loan spread to swap rate - fixed rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan purchase commitments, net, measurement input	1.98
Loan purchase commitments | Whole loan spread to swap rate - fixed rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan purchase commitments, net, measurement input	1.96
Loan purchase commitments | Whole loan spread to swap rate - hybrid | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan purchase commitments, net, measurement input	0.75
Loan purchase commitments | Whole loan spread to swap rate - hybrid | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan purchase commitments, net, measurement input	1.55
Loan purchase commitments | Whole loan spread to swap rate - hybrid | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loan purchase commitments, net, measurement input	0.99
Jumbo fixed-rate loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, at fair value | $	$ 2,729,424
Jumbo fixed-rate loans | Whole loan spread to TBA price | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, measurement input	1.84
Jumbo fixed-rate loans | Whole loan spread to TBA price | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, measurement input	2.80
Jumbo fixed-rate loans | Whole loan spread to TBA price | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, measurement input	2.77
Jumbo fixed-rate loans | Whole loan spread to swap rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, measurement input	0.90
Jumbo fixed-rate loans | Whole loan spread to swap rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, measurement input	1.98
Jumbo fixed-rate loans | Whole loan spread to swap rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, measurement input	1.93
Jumbo hybrid loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, at fair value | $	$ 319,029
Jumbo hybrid loans | Whole loan spread to swap rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, measurement input	0.75
Jumbo hybrid loans | Whole loan spread to swap rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, measurement input	1.55
Jumbo hybrid loans | Whole loan spread to swap rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, measurement input	1.25
Jumbo hybrid loans | Prepayment rate (annual CPR) | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, measurement input	0.15
Jumbo hybrid loans | Prepayment rate (annual CPR) | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, measurement input	0.15
Jumbo hybrid loans | Prepayment rate (annual CPR) | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, measurement input	0.15
Jumbo loans committed to sell
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, at fair value | $	$ 138,540
Jumbo loans committed to sell | Whole loan committed sales price | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, measurement input	100.98
Jumbo loans committed to sell | Whole loan committed sales price | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, measurement input	101.15
Jumbo loans committed to sell | Whole loan committed sales price | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, measurement input	101.08
Legacy Sequoia
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, at fair value | $	$ 553,958
Sequoia Choice
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, at fair value | $	2,181,195
Business purpose loans, at fair value
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, at fair value | $	$ 20,105
Business purpose loans, at fair value | Whole loan spread to swap rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, measurement input	2.47
Business purpose loans, at fair value | Whole loan spread to swap rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, measurement input	2.47
Business purpose loans, at fair value | Whole loan spread to swap rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, measurement input	2.47
Business purpose loans, at fair value | Prepayment rate (annual CPR) | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading and AFS securities, measurement input	0.03
Business purpose loans, at fair value | Prepayment rate (annual CPR) | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading and AFS securities, measurement input	0.03
Business purpose loans, at fair value | Prepayment rate (annual CPR) | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading and AFS securities, measurement input	0.03
Business purpose loans, at fair value | Discount rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSR, measurement input	0.07
Business purpose loans, at fair value | Discount rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSR, measurement input	0.08
Business purpose loans, at fair value | Discount rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSR, measurement input	0.07
Fix-and-flip loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, at fair value | $	$ 95,515
Freddie Mac K-Series
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Residential loans, at fair value | $	942,165
Trading and AFS securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading and AFS securities | $	$ 1,470,084
Trading and AFS securities | Prepayment rate (annual CPR) | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading and AFS securities, measurement input	0.00
Trading and AFS securities | Prepayment rate (annual CPR) | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading and AFS securities, measurement input	0.50
Trading and AFS securities | Prepayment rate (annual CPR) | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading and AFS securities, measurement input	0.08
Trading and AFS securities | Discount rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading and AFS securities, measurement input	0.03
Trading and AFS securities | Discount rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading and AFS securities, measurement input	0.15
Trading and AFS securities | Discount rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading and AFS securities, measurement input	0.06
Trading and AFS securities | Default rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading and AFS securities, measurement input	0.00
Trading and AFS securities | Default rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading and AFS securities, measurement input	0.27
Trading and AFS securities | Default rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading and AFS securities, measurement input	0.02
Trading and AFS securities | Loss severity | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading and AFS securities, measurement input	0.00
Trading and AFS securities | Loss severity | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading and AFS securities, measurement input	0.40
Trading and AFS securities | Loss severity | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading and AFS securities, measurement input	0.22
MSRs
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights | $	$ 63,785
MSRs | Prepayment rate (annual CPR) | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSR, measurement input	0.04
MSRs | Prepayment rate (annual CPR) | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSR, measurement input	0.22
MSRs | Prepayment rate (annual CPR) | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSR, measurement input	0.07
MSRs | Discount rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSR, measurement input	0.11
MSRs | Discount rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSR, measurement input	0.67
MSRs | Discount rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSR, measurement input	0.11
MSRs | Per loan annual cost to service | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSR, measurement input	82
MSRs | Per loan annual cost to service | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSR, measurement input	82
MSRs | Per loan annual cost to service | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
MSR, measurement input	82
Guarantee asset
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Guarantee asset | $	$ 2,885
Guarantee asset | Prepayment rate (annual CPR) | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Guarantee asset, measurement input	0.07
Guarantee asset | Prepayment rate (annual CPR) | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Guarantee asset, measurement input	0.07
Guarantee asset | Prepayment rate (annual CPR) | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Guarantee asset, measurement input	0.07
Guarantee asset | Discount rate | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Guarantee asset, measurement input	0.11
Guarantee asset | Discount rate | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Guarantee asset, measurement input	0.11
Guarantee asset | Discount rate | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Guarantee asset, measurement input	0.11
REO
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
REO | $	$ 1,804
REO | Loss severity | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
REO, measurement input	0.13
REO | Loss severity | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
REO, measurement input	0.45
REO | Loss severity | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
REO, measurement input	0.30

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt.

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Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure.

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Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

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