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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
12 Months Ended
Dec. 31, 2018
USD ($)
$ / loan
ABS Issued Securities  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, fair value | $ $ 2,397,250
Freddie Mac SLST  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, fair value | $ 993,748
Freddie Mac K-Series  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, fair value | $ $ 2,019,075
Prepayment rate (annual CPR) | ABS Issued Securities | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.08
Prepayment rate (annual CPR) | ABS Issued Securities | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.50
Prepayment rate (annual CPR) | ABS Issued Securities | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.18
Prepayment rate (annual CPR) | Freddie Mac SLST | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.06
Prepayment rate (annual CPR) | Freddie Mac SLST | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.06
Prepayment rate (annual CPR) | Freddie Mac SLST | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.06
Prepayment rate (annual CPR) | Freddie Mac K-Series | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.00
Prepayment rate (annual CPR) | Freddie Mac K-Series | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.00
Prepayment rate (annual CPR) | Freddie Mac K-Series | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.00
Discount rate | ABS Issued Securities | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.04
Discount rate | ABS Issued Securities | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.15
Discount rate | ABS Issued Securities | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.04
Discount rate | Freddie Mac SLST | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.03
Discount rate | Freddie Mac SLST | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.04
Discount rate | Freddie Mac SLST | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.03
Discount rate | Freddie Mac K-Series | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.03
Discount rate | Freddie Mac K-Series | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.09
Discount rate | Freddie Mac K-Series | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.03
Default rate | ABS Issued Securities | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.00
Default rate | ABS Issued Securities | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.14
Default rate | ABS Issued Securities | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.02
Default rate | Freddie Mac SLST | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.02
Default rate | Freddie Mac SLST | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.02
Default rate | Freddie Mac SLST | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.02
Default rate | Freddie Mac K-Series | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.01
Default rate | Freddie Mac K-Series | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.01
Default rate | Freddie Mac K-Series | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.01
Loss severity | ABS Issued Securities | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.20
Loss severity | ABS Issued Securities | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.44
Loss severity | ABS Issued Securities | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.21
Loss severity | Freddie Mac SLST | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.30
Loss severity | Freddie Mac SLST | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.30
Loss severity | Freddie Mac SLST | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.30
Loss severity | Freddie Mac K-Series | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.20
Loss severity | Freddie Mac K-Series | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.20
Loss severity | Freddie Mac K-Series | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
ABS issued, measurement inputs 0.20
Jumbo fixed rate loans  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, fair value | $ $ 2,738,346
Jumbo fixed rate loans | Whole loan spread to TBA price | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, measurement inputs 1.89
Jumbo fixed rate loans | Whole loan spread to TBA price | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, measurement inputs 2.52
Jumbo fixed rate loans | Whole loan spread to TBA price | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, measurement inputs 2.21
Jumbo fixed rate loans | Whole loan spread to swap rate | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, measurement inputs 0.0070
Jumbo fixed rate loans | Whole loan spread to swap rate | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, measurement inputs 0.0220
Jumbo fixed rate loans | Whole loan spread to swap rate | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, measurement inputs 0.0200
Jumbo hybrid loans  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, fair value | $ $ 396,274
Jumbo hybrid loans | Whole loan spread to swap rate | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, measurement inputs 0.0050
Jumbo hybrid loans | Whole loan spread to swap rate | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, measurement inputs 0.0125
Jumbo hybrid loans | Whole loan spread to swap rate | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, measurement inputs 0.0086
Jumbo hybrid loans | Prepayment rate (annual CPR) | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, measurement inputs 0.15
Jumbo hybrid loans | Prepayment rate (annual CPR) | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, measurement inputs 0.15
Jumbo hybrid loans | Prepayment rate (annual CPR) | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, measurement inputs 0.15
Jumbo loans committed to sell  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, fair value | $ $ 298,002
Jumbo loans committed to sell | Whole loan committed sales price | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, measurement inputs 100.69
Jumbo loans committed to sell | Whole loan committed sales price | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, measurement inputs 101.66
Jumbo loans committed to sell | Whole loan committed sales price | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, measurement inputs 100.70
Legacy Sequoia  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, fair value | $ $ 519,958
Sequoia Choice  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, fair value | $ 2,079,382
Freddie Mac SLST  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, fair value | $ 1,222,669
Business purpose residential loans  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, fair value | $ $ 28,460
Business purpose residential loans | Prepayment rate (annual CPR) | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, measurement inputs 0.02
Business purpose residential loans | Prepayment rate (annual CPR) | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, measurement inputs 0.10
Business purpose residential loans | Prepayment rate (annual CPR) | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, measurement inputs 0.03
Business purpose residential loans | Discount rate | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.12
Business purpose residential loans | Discount rate | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.12
Business purpose residential loans | Discount rate | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.12
Business purpose residential loans | Senior credit spread | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, measurement inputs 0.0115
Business purpose residential loans | Senior credit spread | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, measurement inputs 0.0115
Business purpose residential loans | Senior credit spread | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, measurement inputs 0.0115
Business purpose residential loans | Senior credit support | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.32
Business purpose residential loans | Senior credit support | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.32
Business purpose residential loans | Senior credit support | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.32
Residential bridge loans held-for-investment  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, fair value | $ $ 112,798
Residential bridge loans held-for-investment | Discount rate | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.07
Residential bridge loans held-for-investment | Discount rate | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.08
Residential bridge loans held-for-investment | Discount rate | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.07
Freddie Mac K-Series  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Residential loans, fair value | $ $ 2,144,598
Trading and AFS securities  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, fair value | $ $ 1,452,494
Trading and AFS securities | Prepayment rate (annual CPR) | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, measurement inputs 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 inputs 0.60
Trading and AFS securities | Prepayment rate (annual CPR) | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, measurement inputs 0.10
Trading and AFS securities | Discount rate | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, measurement inputs 0.03
Trading and AFS securities | Discount rate | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, measurement inputs 0.14
Trading and AFS securities | Discount rate | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, measurement inputs 0.06
Trading and AFS securities | Default rate | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, measurement inputs 0.00
Trading and AFS securities | Default rate | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, measurement inputs 0.27
Trading and AFS securities | Default rate | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, measurement inputs 0.02
Trading and AFS securities | Loss severity | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, measurement inputs 0.00
Trading and AFS securities | Loss severity | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, measurement inputs 0.40
Trading and AFS securities | Loss severity | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, measurement inputs 0.21
Servicer advance investments  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, fair value | $ $ 300,468
Servicer advance investments | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Expected remaining life 1 year
Servicer advance investments | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Expected remaining life 1 year
Servicer advance investments | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Expected remaining life 1 year
Servicer advance investments | Prepayment rate (annual CPR) | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, measurement inputs 0.08
Servicer advance investments | Prepayment rate (annual CPR) | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, measurement inputs 0.16
Servicer advance investments | Prepayment rate (annual CPR) | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, measurement inputs 0.14
Servicer advance investments | Discount rate | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, measurement inputs 0.05
Servicer advance investments | Discount rate | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, measurement inputs 0.05
Servicer advance investments | Discount rate | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Trading and AFS securities, measurement inputs 0.05
Servicer advance investments | Subordinate credit spread | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.0165
Servicer advance investments | Subordinate credit spread | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.0994
Servicer advance investments | Subordinate credit spread | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.0302
Servicer advance investments | Mortgage Servicing Amount | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.0001
Servicer advance investments | Mortgage Servicing Amount | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.0001
Servicer advance investments | Mortgage Servicing Amount | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.0001
MSRs  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, fair value | $ $ 60,281
MSRs | Prepayment rate (annual CPR) | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.04
MSRs | Prepayment rate (annual CPR) | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.29
MSRs | Prepayment rate (annual CPR) | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.07
MSRs | Discount rate | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.11
MSRs | Discount rate | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.29
MSRs | Discount rate | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.11
MSRs | Per loan annual cost to service | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 82
MSRs | Per loan annual cost to service | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 82
MSRs | Per loan annual cost to service | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 82
Excess MSRs  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, fair value | $ $ 27,312
Excess MSRs | Prepayment rate (annual CPR) | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.08
Excess MSRs | Prepayment rate (annual CPR) | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.15
Excess MSRs | Prepayment rate (annual CPR) | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.11
Excess MSRs | Discount rate | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.12
Excess MSRs | Discount rate | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.19
Excess MSRs | Discount rate | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.17
Excess MSRs | Mortgage Servicing Amount | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.0001
Excess MSRs | Mortgage Servicing Amount | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.0002
Excess MSRs | Mortgage Servicing Amount | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
MSRs, measurement inputs 0.0001
Guarantee asset  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Guarantees asset, fair value | $ $ 2,618
Guarantee asset | Prepayment rate (annual CPR) | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Guarantee asset, measurement inputs 0.08
Guarantee asset | Prepayment rate (annual CPR) | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Guarantee asset, measurement inputs 0.08
Guarantee asset | Prepayment rate (annual CPR) | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Guarantee asset, measurement inputs 0.08
Guarantee asset | Discount rate | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Guarantee asset, measurement inputs 0.11
Guarantee asset | Discount rate | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Guarantee asset, measurement inputs 0.11
Guarantee asset | Discount rate | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Guarantee asset, measurement inputs 0.11
REO  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
REO, fair value | $ $ 2,225
REO | Loss severity | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
REO, measurement inputs 0.02
REO | Loss severity | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
REO, measurement inputs 0.50
REO | Loss severity | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
REO, measurement inputs 0.18
Loan purchase commitments  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Loan purchase commitments, net, fair value | $ $ 2,181
Loan purchase commitments | Whole loan spread to TBA price | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Loan purchase commitments, net, measurement inputs 1.89
Loan purchase commitments | Whole loan spread to TBA price | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Loan purchase commitments, net, measurement inputs 2.52
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 inputs 2.51
Loan purchase commitments | Prepayment rate (annual CPR) | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Loan purchase commitments, net, measurement inputs 0.15
Loan purchase commitments | Prepayment rate (annual CPR) | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Loan purchase commitments, net, measurement inputs 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 inputs 0.15
Loan purchase commitments | MSR multiple | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Loan purchase commitments, net, measurement inputs 0.8
Loan purchase commitments | MSR multiple | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Loan purchase commitments, net, measurement inputs 4.9
Loan purchase commitments | MSR multiple | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Loan purchase commitments, net, measurement inputs 2.7
Loan purchase commitments | Pull-through rate | Minimum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Loan purchase commitments, net, measurement inputs 0.10
Loan purchase commitments | Pull-through rate | Maximum  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Loan purchase commitments, net, measurement inputs 0.98
Loan purchase commitments | Pull-through rate | Weighted Average  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Loan purchase commitments, net, measurement inputs 0.69
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 inputs 0.0070
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 inputs 0.0220
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 inputs 0.0198
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 inputs 0.0060
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 inputs 0.0100
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 inputs 0.0077