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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 | Jun. 30, 2018 USD ($) $ / loan | Dec. 31, 2017 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Mortgage servicing rights | $ | $ 64,674 | $ 63,598
ABS Issued |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
ABS issued | $ | $ 1,929,662 |
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 | 0.60 |
ABS Issued | Loss severity | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
ABS issued, measurement input | 0.21 |
Loan purchase commitments |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Loan purchase commitments, net | $ | $ 1,710 |
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 | 2.25 |
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 | 3.28 |
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 | 3.28 |
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 | 5.3 |
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 | 0.13 |
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 | 0.9000 |
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 | 2.0600 |
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 | 2.0400 |
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 | 0.7500 |
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 | 1.4000 |
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 | 1.0700 |
Jumbo fixed-rate loans |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Residential loans, at fair value | $ | $ 2,676,132 |
Jumbo fixed-rate loans | Whole loan spread to TBA price | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Residential loans, measurement input | 2.00 |
Jumbo fixed-rate loans | Whole loan spread to TBA price | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Residential loans, measurement input | 3.28 |
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 | 2.97 |
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 | 0.02 |
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 | 0.02 |
Jumbo hybrid loans |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Residential loans, at fair value | $ | $ 276,844 |
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 | 1.60 |
Jumbo hybrid loans | Whole loan spread to swap rate | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Residential loans, measurement input | 1.33 |
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 | $ | $ 464,905 |
Jumbo loans committed to sell | Whole loan committed sales price | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Residential loans, measurement input | 100.58 |
Jumbo loans committed to sell | Whole loan committed sales price | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Residential loans, measurement input | 101.94 |
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 | 101.45 |
Legacy Sequoia |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Residential loans, at fair value | $ | $ 592,029 |
Sequoia Choice |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Residential loans, at fair value | $ | 1,481,145 |
Trading and AFS securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Trading and AFS securities | $ | $ 1,453,936 |
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 | 0.09 |
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 | 0.14 |
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 | $ | $ 64,674 |
MSRs | Prepayment rate (annual CPR) | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
MSR, measurement input | 0.06 |
MSRs | Prepayment rate (annual CPR) | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
MSR, measurement input | 0.26 |
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 | 0.43 |
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 | $ | $ 2,936 |
Guarantee asset | Prepayment rate (annual CPR) | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Guarantee asset, measurement input | 0.08 |
Guarantee asset | Prepayment rate (annual CPR) | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Guarantee asset, measurement input | 0.08 |
Guarantee asset | Prepayment rate (annual CPR) | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Guarantee asset, measurement input | 0.08 |
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 | $ | $ 1,841 |
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 | 0.43 |
REO | Loss severity | Weighted Average |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
REO, measurement input | 0.29 |

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
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- Definition Fair value of a liability representing servicing arrangements under which the estimated future revenue from contractually specified servicing fees, late charges, and other ancillary revenues are not expected to adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746 + Details
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