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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	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2019 USD ($) $ / loan	Dec. 31, 2018 USD ($)
Liabilities
Contingent consideration		$ 28,484	$ 0
ABS Issued Securities
Liabilities
ABS issued		$ 2,439,663
ABS Issued Securities \| Prepayment rate (annual CPR) \| Minimum
Liabilities
ABS issued, measurement inputs		0.17
ABS Issued Securities \| Prepayment rate (annual CPR) \| Maximum
Liabilities
ABS issued, measurement inputs		0.43
ABS Issued Securities \| Prepayment rate (annual CPR) \| Weighted Average
Liabilities
ABS issued, measurement inputs		0.26
ABS Issued Securities \| Discount rate \| Minimum
Liabilities
ABS issued, measurement inputs		0.03
ABS Issued Securities \| Discount rate \| Maximum
Liabilities
ABS issued, measurement inputs		0.30
ABS Issued Securities \| Discount rate \| Weighted Average
Liabilities
ABS issued, measurement inputs		0.04
ABS Issued Securities \| Default rate \| Minimum
Liabilities
ABS issued, measurement inputs		0
ABS Issued Securities \| Default rate \| Maximum
Liabilities
ABS issued, measurement inputs		0.07
ABS Issued Securities \| Default rate \| Weighted Average
Liabilities
ABS issued, measurement inputs		0
ABS Issued Securities \| Loss severity \| Minimum
Liabilities
ABS issued, measurement inputs		0
ABS Issued Securities \| Loss severity \| Maximum
Liabilities
ABS issued, measurement inputs		0.65
ABS Issued Securities \| Loss severity \| Weighted Average
Liabilities
ABS issued, measurement inputs		0.01
Freddie Mac SLST
Liabilities
ABS issued		$ 1,918,322
Freddie Mac SLST \| Prepayment rate (annual CPR) \| Minimum
Liabilities
ABS issued, measurement inputs		0.06
Freddie Mac SLST \| Prepayment rate (annual CPR) \| Maximum
Liabilities
ABS issued, measurement inputs		0.06
Freddie Mac SLST \| Prepayment rate (annual CPR) \| Weighted Average
Liabilities
ABS issued, measurement inputs		0.06
Freddie Mac SLST \| Discount rate \| Minimum
Liabilities
ABS issued, measurement inputs		0.03
Freddie Mac SLST \| Discount rate \| Maximum
Liabilities
ABS issued, measurement inputs		0.13
Freddie Mac SLST \| Discount rate \| Weighted Average
Liabilities
ABS issued, measurement inputs		0.03
Freddie Mac SLST \| Default rate \| Minimum
Liabilities
ABS issued, measurement inputs		0.17
Freddie Mac SLST \| Default rate \| Maximum
Liabilities
ABS issued, measurement inputs		0.18
Freddie Mac SLST \| Default rate \| Weighted Average
Liabilities
ABS issued, measurement inputs		0.17
Freddie Mac SLST \| Loss severity \| Minimum
Liabilities
ABS issued, measurement inputs		0.30
Freddie Mac SLST \| Loss severity \| Maximum
Liabilities
ABS issued, measurement inputs		0.30
Freddie Mac SLST \| Loss severity \| Weighted Average
Liabilities
ABS issued, measurement inputs		0.30
Freddie Mac K-Series
Liabilities
ABS issued		$ 4,156,239
Freddie Mac K-Series \| Discount rate \| Minimum
Liabilities
ABS issued, measurement inputs		0.01
Freddie Mac K-Series \| Discount rate \| Maximum
Liabilities
ABS issued, measurement inputs		0.09
Freddie Mac K-Series \| Discount rate \| Weighted Average
Liabilities
ABS issued, measurement inputs		0.03
Freddie Mac K-Series \| Non-IO prepayment rate (annual CPR) \| Minimum
Liabilities
ABS issued, measurement inputs		0
Freddie Mac K-Series \| Non-IO prepayment rate (annual CPR) \| Maximum
Liabilities
ABS issued, measurement inputs		0
Freddie Mac K-Series \| Non-IO prepayment rate (annual CPR) \| Weighted Average
Liabilities
ABS issued, measurement inputs		0
Freddie Mac K-Series \| IO prepayment rate (annual CPY/CPP) \| Minimum
Liabilities
ABS issued, measurement inputs		0
Freddie Mac K-Series \| IO prepayment rate (annual CPY/CPP) \| Maximum
Liabilities
ABS issued, measurement inputs		1
Freddie Mac K-Series \| IO prepayment rate (annual CPY/CPP) \| Weighted Average
Liabilities
ABS issued, measurement inputs		0.94
CAFL
Liabilities
ABS issued		$ 2,001,251
CAFL \| Prepayment rate (annual CPR) \| Minimum
Liabilities
ABS issued, measurement inputs		0
CAFL \| Prepayment rate (annual CPR) \| Maximum
Liabilities
ABS issued, measurement inputs		0.05
CAFL \| Prepayment rate (annual CPR) \| Weighted Average
Liabilities
ABS issued, measurement inputs		0
CAFL \| Discount rate \| Minimum
Liabilities
ABS issued, measurement inputs		0.02
CAFL \| Discount rate \| Maximum
Liabilities
ABS issued, measurement inputs		0.30
CAFL \| Discount rate \| Weighted Average
Liabilities
ABS issued, measurement inputs		0.04
Contingent Consideration
Liabilities
Contingent consideration		$ 28,484
Contingent Consideration \| Discount rate \| Minimum
Liabilities
Contingent consideration, measurement inputs \| $ / loan		0.23
Contingent Consideration \| Discount rate \| Maximum
Liabilities
Contingent consideration, measurement inputs \| $ / loan		0.23
Contingent Consideration \| Discount rate \| Weighted Average
Liabilities
Contingent consideration, measurement inputs \| $ / loan		0.23
Contingent Consideration \| Probability of outcomes \| Minimum
Liabilities
Contingent consideration, measurement inputs \| $ / loan		1
Contingent Consideration \| Probability of outcomes \| Maximum
Liabilities
Contingent consideration, measurement inputs \| $ / loan		1
Contingent Consideration \| Probability of outcomes \| Weighted Average
Liabilities
Contingent consideration, measurement inputs \| $ / loan		1
Jumbo fixed rate loans
Assets
Residential loans, at fair value		$ 2,113,977
Jumbo fixed rate loans \| Prepayment rate (annual CPR) \| Minimum
Assets
Residential loans, measurement inputs		0.20
Jumbo fixed rate loans \| Prepayment rate (annual CPR) \| Maximum
Assets
Residential loans, measurement inputs		0.20
Jumbo fixed rate loans \| Prepayment rate (annual CPR) \| Weighted Average
Assets
Residential loans, measurement inputs		0.20
Jumbo fixed rate loans \| Whole loan spread to TBA price \| Minimum
Assets
Residential loans, measurement inputs \| $ / loan		0.53
Jumbo fixed rate loans \| Whole loan spread to TBA price \| Maximum
Assets
Residential loans, measurement inputs \| $ / loan		1.63
Jumbo fixed rate loans \| Whole loan spread to TBA price \| Weighted Average
Assets
Residential loans, measurement inputs \| $ / loan		1.62
Jumbo fixed rate loans \| Whole loan spread to swap rate \| Minimum
Assets
Residential loans, measurement inputs		0.0095
Jumbo fixed rate loans \| Whole loan spread to swap rate \| Maximum
Assets
Residential loans, measurement inputs		0.0375
Jumbo fixed rate loans \| Whole loan spread to swap rate \| Weighted Average
Assets
Residential loans, measurement inputs		0.0170
Jumbo hybrid loans
Assets
Residential loans, at fair value		$ 326,336
Jumbo hybrid loans \| Prepayment rate (annual CPR) \| Minimum
Assets
Residential loans, measurement inputs		0.15
Jumbo hybrid loans \| Prepayment rate (annual CPR) \| Maximum
Assets
Residential loans, measurement inputs		0.15
Jumbo hybrid loans \| Prepayment rate (annual CPR) \| Weighted Average
Assets
Residential loans, measurement inputs		0.15
Jumbo hybrid loans \| Whole loan spread to swap rate \| Minimum
Assets
Residential loans, measurement inputs		0.0080
Jumbo hybrid loans \| Whole loan spread to swap rate \| Maximum
Assets
Residential loans, measurement inputs		0.0345
Jumbo hybrid loans \| Whole loan spread to swap rate \| Weighted Average
Assets
Residential loans, measurement inputs		0.0134
Jumbo loans committed to sell
Assets
Residential loans, at fair value		$ 207,864
Jumbo loans committed to sell \| Whole loan committed sales price \| Minimum
Assets
Residential loans, measurement inputs \| $ / loan		101.85
Jumbo loans committed to sell \| Whole loan committed sales price \| Maximum
Assets
Residential loans, measurement inputs \| $ / loan		102.96
Jumbo loans committed to sell \| Whole loan committed sales price \| Weighted Average
Assets
Residential loans, measurement inputs \| $ / loan		102.41
Business purpose residential loans \| Senior Credit Spread \| Minimum
Assets
Residential loans, measurement inputs		0.0100
Business purpose residential loans \| Senior Credit Spread \| Maximum
Assets
Residential loans, measurement inputs		0.0105
Business purpose residential loans \| Senior Credit Spread \| Weighted Average
Assets
Residential loans, measurement inputs		0.0103
Business purpose residential loans \| Subordinate Credit Spread \| Minimum
Assets
Residential loans, measurement inputs		0.0135
Business purpose residential loans \| Subordinate Credit Spread \| Maximum
Assets
Residential loans, measurement inputs		0.1400
Business purpose residential loans \| Subordinate Credit Spread \| Weighted Average
Assets
Residential loans, measurement inputs		0.0299
Legacy Sequoia
Assets
Residential loans, at fair value		$ 407,890
Sequoia Choice
Assets
Residential loans, at fair value		2,291,463
Liabilities
Fair value of securities owned		264,000
Freddie Mac SLST
Assets
Residential loans, at fair value		2,367,215
Liabilities
Fair value of securities owned		449,000
Single-family rental loans
Assets
Residential loans, at fair value		$ 569,185
Single-family rental loans \| Prepayment rate (annual CPR) \| Minimum
Assets
Residential loans, measurement inputs		0.05
Single-family rental loans \| Prepayment rate (annual CPR) \| Maximum
Assets
Residential loans, measurement inputs		0.05
Single-family rental loans \| Prepayment rate (annual CPR) \| Weighted Average
Assets
Residential loans, measurement inputs		0.05
Single-family rental loans \| Senior credit support \| Minimum
Assets
Servicing assets, measurement inputs		0.33
Single-family rental loans \| Senior credit support \| Maximum
Assets
Servicing assets, measurement inputs		0.40
Single-family rental loans \| Senior credit support \| Weighted Average
Assets
Servicing assets, measurement inputs		0.34
Single-family rental loans \| IO discount rate \| Minimum
Assets
Residential loans, measurement inputs		0.06
Single-family rental loans \| IO discount rate \| Maximum
Assets
Residential loans, measurement inputs		0.09
Single-family rental loans \| IO discount rate \| Weighted Average
Assets
Residential loans, measurement inputs		0.08
CAFL
Assets
Residential loans, at fair value		$ 2,192,552
Liabilities
Fair value of securities owned		191,000
Residential bridge loans held-for-investment
Assets
Residential loans, at fair value		$ 745,006
Residential bridge loans held-for-investment \| Discount rate \| Minimum
Assets
Residential loans, measurement inputs		0.06
Residential bridge loans held-for-investment \| Discount rate \| Maximum
Assets
Residential loans, measurement inputs		0.10
Residential bridge loans held-for-investment \| Discount rate \| Weighted Average
Assets
Residential loans, measurement inputs		0.07
Freddie Mac K-Series
Assets
Residential loans, at fair value		$ 4,408,524
Liabilities
Fair value of securities owned		252,000
Trading and AFS securities
Assets
Trading and AFS securities		$ 1,099,874
Trading and AFS securities \| Prepayment rate (annual CPR) \| Minimum
Assets
Trading and AFS securities, measurement inputs		0.05
Trading and AFS securities \| Prepayment rate (annual CPR) \| Maximum
Assets
Trading and AFS securities, measurement inputs		0.50
Trading and AFS securities \| Prepayment rate (annual CPR) \| Weighted Average
Assets
Trading and AFS securities, measurement inputs		0.16
Trading and AFS securities \| Discount rate \| Minimum
Assets
Trading and AFS securities, measurement inputs		0.03
Trading and AFS securities \| Discount rate \| Maximum
Assets
Trading and AFS securities, measurement inputs		0.40
Trading and AFS securities \| Discount rate \| Weighted Average
Assets
Trading and AFS securities, measurement inputs		0.05
Trading and AFS securities \| Default rate \| Minimum
Assets
Trading and AFS securities, measurement inputs		0
Trading and AFS securities \| Default rate \| Maximum
Assets
Trading and AFS securities, measurement inputs		0.07
Trading and AFS securities \| Default rate \| Weighted Average
Assets
Trading and AFS securities, measurement inputs		0.01
Trading and AFS securities \| Loss severity \| Minimum
Assets
Trading and AFS securities, measurement inputs		0
Trading and AFS securities \| Loss severity \| Maximum
Assets
Trading and AFS securities, measurement inputs		0.30
Trading and AFS securities \| Loss severity \| Weighted Average
Assets
Trading and AFS securities, measurement inputs		0.05
Servicer advance investments
Assets
Servicing assets		$ 169,204
Servicer advance investments \| Minimum
Assets
Expected remaining life	2 years
Servicer advance investments \| Maximum
Assets
Expected remaining life	2 years
Servicer advance investments \| Weighted Average
Assets
Expected remaining life	2 years
Servicer advance investments \| Prepayment rate (annual CPR) \| Minimum
Assets
Servicing assets, measurement inputs		0.08
Servicer advance investments \| Prepayment rate (annual CPR) \| Maximum
Assets
Servicing assets, measurement inputs		0.15
Servicer advance investments \| Prepayment rate (annual CPR) \| Weighted Average
Assets
Servicing assets, measurement inputs		0.14
Servicer advance investments \| Discount rate \| Minimum
Assets
Servicing assets, measurement inputs		0.05
Servicer advance investments \| Discount rate \| Maximum
Assets
Servicing assets, measurement inputs		0.05
Servicer advance investments \| Discount rate \| Weighted Average
Assets
Servicing assets, measurement inputs		0.05
MSRs
Assets
Servicing assets		$ 42,224
MSRs \| Prepayment rate (annual CPR) \| Minimum
Assets
Servicing assets, measurement inputs		0.05
MSRs \| Prepayment rate (annual CPR) \| Maximum
Assets
Servicing assets, measurement inputs		0.44
MSRs \| Prepayment rate (annual CPR) \| Weighted Average
Assets
Servicing assets, measurement inputs		0.11
MSRs \| Discount rate \| Minimum
Assets
Servicing assets, measurement inputs		0.11
MSRs \| Discount rate \| Maximum
Assets
Servicing assets, measurement inputs		0.12
MSRs \| Discount rate \| Weighted Average
Assets
Servicing assets, measurement inputs		0.11
MSRs \| Per loan annual cost to service \| Minimum
Assets
Servicing assets, measurement inputs \| $ / loan		82
MSRs \| Per loan annual cost to service \| Maximum
Assets
Servicing assets, measurement inputs \| $ / loan		82
MSRs \| Per loan annual cost to service \| Weighted Average
Assets
Servicing assets, measurement inputs \| $ / loan		82
Excess MSRs
Assets
Servicing assets		$ 31,814
Excess MSRs \| Prepayment rate (annual CPR) \| Minimum
Assets
Servicing assets, measurement inputs		0.09
Excess MSRs \| Prepayment rate (annual CPR) \| Maximum
Assets
Servicing assets, measurement inputs		0.14
Excess MSRs \| Prepayment rate (annual CPR) \| Weighted Average
Assets
Servicing assets, measurement inputs		0.11
Excess MSRs \| Discount rate \| Minimum
Assets
Servicing assets, measurement inputs		0.11
Excess MSRs \| Discount rate \| Maximum
Assets
Servicing assets, measurement inputs		0.16
Excess MSRs \| Discount rate \| Weighted Average
Assets
Servicing assets, measurement inputs		0.14
Excess MSRs \| Excess mortgage servicing amount \| Minimum
Assets
Servicing assets, measurement inputs		0.0008
Excess MSRs \| Excess mortgage servicing amount \| Maximum
Assets
Servicing assets, measurement inputs		0.0018
Excess MSRs \| Excess mortgage servicing amount \| Weighted Average
Assets
Servicing assets, measurement inputs		0.0013
Shared Home Appreciation Options
Assets
Shared home appreciation options		$ 45,085
Shared Home Appreciation Options \| Prepayment rate (annual CPR) \| Minimum
Assets
Shared home appreciation options, measurement inputs		0.10
Shared Home Appreciation Options \| Prepayment rate (annual CPR) \| Maximum
Assets
Shared home appreciation options, measurement inputs		0.30
Shared Home Appreciation Options \| Prepayment rate (annual CPR) \| Weighted Average
Assets
Shared home appreciation options, measurement inputs		0.23
Shared Home Appreciation Options \| Discount rate \| Minimum
Assets
Shared home appreciation options, measurement inputs		0.11
Shared Home Appreciation Options \| Discount rate \| Maximum
Assets
Shared home appreciation options, measurement inputs		0.11
Shared Home Appreciation Options \| Discount rate \| Weighted Average
Assets
Shared home appreciation options, measurement inputs		0.11
Shared Home Appreciation Options \| Home price appreciation \| Minimum
Assets
Shared home appreciation options, measurement inputs		0.03
Shared Home Appreciation Options \| Home price appreciation \| Maximum
Assets
Shared home appreciation options, measurement inputs		0.03
Shared Home Appreciation Options \| Home price appreciation \| Weighted Average
Assets
Shared home appreciation options, measurement inputs		0.03
Guarantee asset
Assets
Guarantee asset		$ 1,686
Guarantee asset \| Prepayment rate (annual CPR) \| Minimum
Assets
Guarantee asset, measurement inputs		0.15
Guarantee asset \| Prepayment rate (annual CPR) \| Maximum
Assets
Guarantee asset, measurement inputs		0.15
Guarantee asset \| Prepayment rate (annual CPR) \| Weighted Average
Assets
Guarantee asset, measurement inputs		0.15
Guarantee asset \| Discount rate \| Minimum
Assets
Guarantee asset, measurement inputs		0.11
Guarantee asset \| Discount rate \| Maximum
Assets
Guarantee asset, measurement inputs		0.11
Guarantee asset \| Discount rate \| Weighted Average
Assets
Guarantee asset, measurement inputs		0.11
REO
Assets
REO		$ 4,051
REO \| Loss severity \| Minimum
Assets
REO, measurement inputs		0.17
REO \| Loss severity \| Maximum
Assets
REO, measurement inputs		0.55
REO \| Loss severity \| Weighted Average
Assets
REO, measurement inputs		0.26
Loan purchase and interest rate lock commitments
Assets
Loan purchase commitments, net		$ 8,419
Loan purchase and interest rate lock commitments \| Prepayment rate (annual CPR) \| Minimum
Assets
Residential loans, measurement inputs		0.15
Loan purchase and interest rate lock commitments \| Prepayment rate (annual CPR) \| Maximum
Assets
Residential loans, measurement inputs		0.20
Loan purchase and interest rate lock commitments \| Prepayment rate (annual CPR) \| Weighted Average
Assets
Residential loans, measurement inputs		0.20
Loan purchase and interest rate lock commitments \| Whole loan spread to TBA price \| Minimum
Assets
Residential loans, measurement inputs \| $ / loan		0.53
Loan purchase and interest rate lock commitments \| Whole loan spread to TBA price \| Maximum
Assets
Residential loans, measurement inputs \| $ / loan		1.63
Loan purchase and interest rate lock commitments \| Whole loan spread to TBA price \| Weighted Average
Assets
Residential loans, measurement inputs \| $ / loan		1.62
Loan purchase and interest rate lock commitments \| Mortgage servicing income \| Minimum
Assets
Loan purchase commitments, net, measurement inputs		0.0008
Loan purchase and interest rate lock commitments \| Mortgage servicing income \| Maximum
Assets
Loan purchase commitments, net, measurement inputs		0.0013
Loan purchase and interest rate lock commitments \| Mortgage servicing income \| Weighted Average
Assets
Loan purchase commitments, net, measurement inputs		0.001
Loan purchase and interest rate lock commitments \| MSR multiple \| Minimum
Assets
Residential loans, measurement inputs		0.7
Loan purchase and interest rate lock commitments \| MSR multiple \| Maximum
Assets
Residential loans, measurement inputs		4.3
Loan purchase and interest rate lock commitments \| MSR multiple \| Weighted Average
Assets
Residential loans, measurement inputs		2.8
Loan purchase and interest rate lock commitments \| Pull-through rate \| Minimum
Assets
Residential loans, measurement inputs		0.08
Loan purchase and interest rate lock commitments \| Pull-through rate \| Maximum
Assets
Residential loans, measurement inputs		1
Loan purchase and interest rate lock commitments \| Pull-through rate \| Weighted Average
Assets
Residential loans, measurement inputs		0.75
Loan purchase and interest rate lock commitments \| Whole loan spread to swap - fixed \| Minimum
Assets
Loan purchase commitments, net, measurement inputs		0.0115
Loan purchase and interest rate lock commitments \| Whole loan spread to swap - fixed \| Maximum
Assets
Loan purchase commitments, net, measurement inputs		0.0375
Loan purchase and interest rate lock commitments \| Whole loan spread to swap - fixed \| Weighted Average
Assets
Loan purchase commitments, net, measurement inputs		0.0253
Loan purchase and interest rate lock commitments \| Whole loan spread to swap rate - hybrid \| Minimum
Assets
Loan purchase commitments, net, measurement inputs		0.0115
Loan purchase and interest rate lock commitments \| Whole loan spread to swap rate - hybrid \| Maximum
Assets
Loan purchase commitments, net, measurement inputs		0.0155
Loan purchase and interest rate lock commitments \| Whole loan spread to swap rate - hybrid \| Weighted Average
Assets
Loan purchase commitments, net, measurement inputs		0.0131
Single-family loan purchase commitments
Assets
Loan purchase commitments, net		$ 440
Single-family loan purchase commitments \| Prepayment rate (annual CPR) \| Minimum
Assets
Residential loans, measurement inputs		0.05
Single-family loan purchase commitments \| Prepayment rate (annual CPR) \| Maximum
Assets
Residential loans, measurement inputs		0.05
Single-family loan purchase commitments \| Prepayment rate (annual CPR) \| Weighted Average
Assets
Residential loans, measurement inputs		0.05
Single-family loan purchase commitments \| Senior Credit Spread \| Minimum
Assets
Residential loans, measurement inputs		0.01
Single-family loan purchase commitments \| Senior Credit Spread \| Maximum
Assets
Residential loans, measurement inputs		0.01
Single-family loan purchase commitments \| Senior Credit Spread \| Weighted Average
Assets
Residential loans, measurement inputs		0.01
Single-family loan purchase commitments \| Subordinate Credit Spread \| Minimum
Assets
Residential loans, measurement inputs		0.01
Single-family loan purchase commitments \| Subordinate Credit Spread \| Maximum
Assets
Residential loans, measurement inputs		1.40
Single-family loan purchase commitments \| Subordinate Credit Spread \| Weighted Average
Assets
Residential loans, measurement inputs		0.03
Single-family loan purchase commitments \| Senior credit support \| Minimum
Assets
Residential loans, measurement inputs		0.33
Single-family loan purchase commitments \| Senior credit support \| Maximum
Assets
Residential loans, measurement inputs		0.33
Single-family loan purchase commitments \| Senior credit support \| Weighted Average
Assets
Residential loans, measurement inputs		0.33
Single-family loan purchase commitments \| Pull-through rate \| Minimum
Assets
Residential loans, measurement inputs		1
Single-family loan purchase commitments \| Pull-through rate \| Maximum
Assets
Residential loans, measurement inputs		1
Single-family loan purchase commitments \| Pull-through rate \| Weighted Average
Assets
Residential loans, measurement inputs		1
Single-family loan purchase commitments \| IO discount rate \| Minimum
Assets
Residential loans, measurement inputs		0.06
Single-family loan purchase commitments \| IO discount rate \| Maximum
Assets
Residential loans, measurement inputs		0.07
Single-family loan purchase commitments \| IO discount rate \| Weighted Average
Assets
Residential loans, measurement inputs		0.07