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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	6 Months Ended
	Jun. 30, 2024 USD ($) $ / loan securitization_entity	Dec. 31, 2023 USD ($)
Assets
Debt Instrument, Fair Value Disclosure	$ 10,975,688	$ 9,151,263
Liabilities
Securitization entity | securitization_entity	2
VIEs | Collateralized Financing Entities | HEI
Liabilities
Fair value of securities owned	$ 41,000
ABS Issued
Liabilities
ABS issued	$ 6,686,531
ABS Issued | Prepayment rate (annual CPR) | Minimum
Liabilities
ABS issued, measurement input	0.02
ABS Issued | Prepayment rate (annual CPR) | Maximum
Liabilities
ABS issued, measurement input	0.44
ABS Issued | Prepayment rate (annual CPR) | Weighted Average
Liabilities
ABS issued, measurement input	0.09
ABS Issued | Whole loan discount rate | Minimum
Liabilities
ABS issued, measurement input	0.04
ABS Issued | Whole loan discount rate | Maximum
Liabilities
ABS issued, measurement input	0.28
ABS Issued | Whole loan discount rate | Weighted Average
Liabilities
ABS issued, measurement input	0.08
ABS Issued | Default rate | Minimum
Liabilities
ABS issued, measurement input	0
ABS Issued | Default rate | Maximum
Liabilities
ABS issued, measurement input	0.11
ABS Issued | Default rate | Weighted Average
Liabilities
ABS issued, measurement input	0.01
ABS Issued | Loss severity | Minimum
Liabilities
ABS issued, measurement input	0.25
ABS Issued | Loss severity | Maximum
Liabilities
ABS issued, measurement input	0.50
ABS Issued | Loss severity | Weighted Average
Liabilities
ABS issued, measurement input	0.29
CAFL
Liabilities
ABS issued	$ 2,409,559
CAFL | Prepayment rate (annual CPR) | Minimum
Liabilities
ABS issued, measurement input	0
CAFL | Prepayment rate (annual CPR) | Maximum
Liabilities
ABS issued, measurement input	0.03
CAFL | Prepayment rate (annual CPR) | Weighted Average
Liabilities
ABS issued, measurement input	0.001
CAFL | Whole loan discount rate | Minimum
Liabilities
ABS issued, measurement input	0.05
CAFL | Whole loan discount rate | Maximum
Liabilities
ABS issued, measurement input	0.12
CAFL | Whole loan discount rate | Weighted Average
Liabilities
ABS issued, measurement input	0.07
CAFL | Default rate | Minimum
Liabilities
ABS issued, measurement input	0.03
CAFL | Default rate | Maximum
Liabilities
ABS issued, measurement input	0.13
CAFL | Default rate | Weighted Average
Liabilities
ABS issued, measurement input	0.06
CAFL | Loss severity | Minimum
Liabilities
ABS issued, measurement input	0.25
CAFL | Loss severity | Maximum
Liabilities
ABS issued, measurement input	0.25
CAFL | Loss severity | Weighted Average
Liabilities
ABS issued, measurement input	0.25
Freddie Mac SLST
Liabilities
ABS issued	$ 1,041,807
Freddie Mac SLST | Prepayment rate (annual CPR) | Minimum
Liabilities
ABS issued, measurement input	0.06
Freddie Mac SLST | Prepayment rate (annual CPR) | Maximum
Liabilities
ABS issued, measurement input	0.06
Freddie Mac SLST | Prepayment rate (annual CPR) | Weighted Average
Liabilities
ABS issued, measurement input	0.06
Freddie Mac SLST | Whole loan discount rate | Minimum
Liabilities
ABS issued, measurement input	0.05
Freddie Mac SLST | Whole loan discount rate | Maximum
Liabilities
ABS issued, measurement input	0.10
Freddie Mac SLST | Whole loan discount rate | Weighted Average
Liabilities
ABS issued, measurement input	0.06
Freddie Mac SLST | Default rate | Minimum
Liabilities
ABS issued, measurement input	0.14
Freddie Mac SLST | Default rate | Maximum
Liabilities
ABS issued, measurement input	0.16
Freddie Mac SLST | Default rate | Weighted Average
Liabilities
ABS issued, measurement input	0.15
Freddie Mac SLST | Loss severity | Minimum
Liabilities
ABS issued, measurement input	0.25
Freddie Mac SLST | Loss severity | Maximum
Liabilities
ABS issued, measurement input	0.25
Freddie Mac SLST | Loss severity | Weighted Average
Liabilities
ABS issued, measurement input	0.25
Freddie Mac K-Series
Liabilities
ABS issued	$ 387,791
Freddie Mac K-Series | Whole loan discount rate | Minimum
Liabilities
ABS issued, measurement input	0.05
Freddie Mac K-Series | Whole loan discount rate | Maximum
Liabilities
ABS issued, measurement input	0.10
Freddie Mac K-Series | Whole loan discount rate | Weighted Average
Liabilities
ABS issued, measurement input	0.06
Consolidated HEI Entities
Liabilities
ABS issued	$ 218,203
Consolidated HEI Entities | Prepayment rate (annual CPR) | Minimum
Liabilities
ABS issued, measurement input	0.15
Consolidated HEI Entities | Prepayment rate (annual CPR) | Maximum
Liabilities
ABS issued, measurement input	0.15
Consolidated HEI Entities | Prepayment rate (annual CPR) | Weighted Average
Liabilities
ABS issued, measurement input	0.15
Consolidated HEI Entities | Whole loan discount rate | Minimum
Liabilities
ABS issued, measurement input	0.08
Consolidated HEI Entities | Whole loan discount rate | Maximum
Liabilities
ABS issued, measurement input	0.12
Consolidated HEI Entities | Whole loan discount rate | Weighted Average
Liabilities
ABS issued, measurement input	0.09
Consolidated HEI Entities | Home price appreciation (depreciation) | Minimum
Liabilities
ABS issued, measurement input	0.04
Consolidated HEI Entities | Home price appreciation (depreciation) | Maximum
Liabilities
ABS issued, measurement input	0.04
Consolidated HEI Entities | Home price appreciation (depreciation) | Weighted Average
Liabilities
ABS issued, measurement input	0.04
At consolidated CAFL Bridge entities
Liabilities
ABS issued	$ 231,797
At consolidated CAFL Bridge entities | Prepayment rate (annual CPR) | Minimum
Liabilities
ABS issued, measurement input	0.40
At consolidated CAFL Bridge entities | Prepayment rate (annual CPR) | Maximum
Liabilities
ABS issued, measurement input	0.40
At consolidated CAFL Bridge entities | Prepayment rate (annual CPR) | Weighted Average
Liabilities
ABS issued, measurement input	0.40
At consolidated CAFL Bridge entities | Whole loan discount rate | Minimum
Liabilities
ABS issued, measurement input	0.07
At consolidated CAFL Bridge entities | Whole loan discount rate | Maximum
Liabilities
ABS issued, measurement input	0.14
At consolidated CAFL Bridge entities | Whole loan discount rate | Weighted Average
Liabilities
ABS issued, measurement input	0.08
At consolidated CAFL Bridge entities | Default rate | Minimum
Liabilities
ABS issued, measurement input	0
At consolidated CAFL Bridge entities | Default rate | Maximum
Liabilities
ABS issued, measurement input	0.05
At consolidated CAFL Bridge entities | Default rate | Weighted Average
Liabilities
ABS issued, measurement input	0.03
At consolidated CAFL Bridge entities | Loss severity | Minimum
Liabilities
ABS issued, measurement input	0.25
At consolidated CAFL Bridge entities | Loss severity | Maximum
Liabilities
ABS issued, measurement input	0.25
At consolidated CAFL Bridge entities | Loss severity | Weighted Average
Liabilities
ABS issued, measurement input	0.25
Jumbo loans
Assets
Debt Instrument, Fair Value Disclosure	$ 961,022
Jumbo loans | Senior credit spread to TBA price | Minimum
Assets
Loans held-for-sale, measurement input | $ / loan	1.13
Jumbo loans | Senior credit spread to TBA price | Maximum
Assets
Loans held-for-sale, measurement input | $ / loan	2.00
Jumbo loans | Senior credit spread to TBA price | Weighted Average
Assets
Loans held-for-sale, measurement input | $ / loan	1.21
Jumbo loans | Subordinate credit spread | Minimum
Assets
Loans receivable, measurement input	0.0200
Jumbo loans | Subordinate credit spread | Maximum
Assets
Loans receivable, measurement input	0.0650
Jumbo loans | Subordinate credit spread | Weighted Average
Assets
Loans receivable, measurement input	0.0276
Jumbo loans | Senior credit support | Minimum
Assets
Loan purchase commitments, measurement input	0.07
Jumbo loans | Senior credit support | Maximum
Assets
Loan purchase commitments, measurement input	0.07
Jumbo loans | Senior credit support | Weighted Average
Assets
Loan purchase commitments, measurement input	0.07
Jumbo loans | IO discount rate | Minimum
Assets
Loans receivable, measurement input	0.24
Jumbo loans | IO discount rate | Maximum
Assets
Loans receivable, measurement input	0.24
Jumbo loans | IO discount rate | Weighted Average
Assets
Loans receivable, measurement input	0.24
Jumbo loans | Prepayment rate (annual CPR) | Minimum
Assets
Loans held-for-sale, measurement input | $ / loan	0.15
Jumbo loans | Prepayment rate (annual CPR) | Maximum
Assets
Loans held-for-sale, measurement input | $ / loan	0.15
Jumbo loans | Prepayment rate (annual CPR) | Weighted Average
Assets
Loans held-for-sale, measurement input | $ / loan	0.15
Jumbo loans committed to sell
Assets
Loans receivable, fair value	$ 1,526
Jumbo loans committed to sell | Whole loan committed sales price | Minimum
Assets
Residential loans, measurement input | $ / loan	100
Jumbo loans committed to sell | Whole loan committed sales price | Maximum
Assets
Residential loans, measurement input | $ / loan	103
Jumbo loans committed to sell | Whole loan committed sales price | Weighted Average
Assets
Residential loans, measurement input | $ / loan	101
Sequoia
Assets
Loans receivable, fair value	$ 6,950,586
Liabilities
Fair value of securities owned	264,000
Freddie Mac SLST
Assets
Loans receivable, fair value	1,297,022
Liabilities
Fair value of securities owned	258,000	274,000
Residential investor term loans
Assets
Loans receivable, fair value	$ 217,761
Residential investor term loans | Subordinate credit spread | Minimum
Assets
Loans receivable, measurement input	0.0165
Residential investor term loans | Subordinate credit spread | Maximum
Assets
Loans receivable, measurement input	0.1062
Residential investor term loans | Subordinate credit spread | Weighted Average
Assets
Loans receivable, measurement input	0.0334
Residential investor term loans | Senior credit support | Minimum
Assets
Loans receivable, measurement input	0.34
Residential investor term loans | Senior credit support | Maximum
Assets
Loans receivable, measurement input	0.34
Residential investor term loans | Senior credit support | Weighted Average
Assets
Loans receivable, measurement input	0.34
Residential investor term loans | Prepayment rate (annual CPR) | Minimum
Assets
Loans receivable, measurement input	0
Residential investor term loans | Prepayment rate (annual CPR) | Maximum
Assets
Loans receivable, measurement input	0.03
Residential investor term loans | Prepayment rate (annual CPR) | Weighted Average
Assets
Loans receivable, measurement input	0.03
Residential investor term loans | Senior credit spread | Minimum
Assets
Loans receivable, measurement input	0.0130
Residential investor term loans | Senior credit spread | Maximum
Assets
Loans receivable, measurement input	0.0130
Residential investor term loans | Senior credit spread | Weighted Average
Assets
Loans receivable, measurement input	0.0130
Residential investor term loans | Dollar price of non-performing loans | Minimum
Assets
Loans receivable, measurement input | $ / loan	54
Residential investor term loans | Dollar price of non-performing loans | Maximum
Assets
Loans receivable, measurement input | $ / loan	54
Residential investor term loans | Dollar price of non-performing loans | Weighted Average
Assets
Loans receivable, measurement input | $ / loan	54
CAFL
Assets
Loans receivable, fair value	$ 2,737,467
Liabilities
Fair value of securities owned	337,000	323,000
BPL bridge loans held by CAFL
Assets
Loans receivable, fair value	$ 234,311
Liabilities
Securitization entity | securitization_entity	1
Residential investor bridge loans
Assets
Loans receivable, fair value	$ 1,690,111
Residential investor bridge loans | Whole loan discount rate | Minimum
Assets
Loans held-for-investment, measurement input	0.09
Residential investor bridge loans | Whole loan discount rate | Maximum
Assets
Loans held-for-investment, measurement input	0.11
Residential investor bridge loans | Whole loan discount rate | Weighted Average
Assets
Loans held-for-investment, measurement input	0.09
Residential investor bridge loans | Whole loan spread | Minimum
Assets
Loans held-for-investment, measurement input	0.0485
Residential investor bridge loans | Whole loan spread | Maximum
Assets
Loans held-for-investment, measurement input	0.0485
Residential investor bridge loans | Whole loan spread | Weighted Average
Assets
Loans held-for-investment, measurement input	0.0485
Residential investor bridge loans | Dollar price of non-performing loans | Minimum
Assets
Loans held-for-investment, measurement input | $ / loan	41
Residential investor bridge loans | Dollar price of non-performing loans | Maximum
Assets
Loans held-for-investment, measurement input | $ / loan	100
Residential investor bridge loans | Dollar price of non-performing loans | Weighted Average
Assets
Loans held-for-investment, measurement input | $ / loan	90
Freddie Mac K-Series
Assets
Loans receivable, fair value	$ 421,794
Liabilities
Fair value of securities owned	34,000
Trading and AFS securities
Assets
Trading and AFS securities	$ 264,401
Trading and AFS securities | Prepayment rate (annual CPR) | Minimum
Assets
Trading and AFS securities	0
Trading and AFS securities | Prepayment rate (annual CPR) | Maximum
Assets
Trading and AFS securities	0.65
Trading and AFS securities | Prepayment rate (annual CPR) | Weighted Average
Assets
Trading and AFS securities	0.08
Trading and AFS securities | Whole loan discount rate | Minimum
Assets
Trading and AFS securities	0.06
Trading and AFS securities | Whole loan discount rate | Maximum
Assets
Trading and AFS securities	0.28
Trading and AFS securities | Whole loan discount rate | Weighted Average
Assets
Trading and AFS securities	0.10
Trading and AFS securities | Default rate | Minimum
Assets
Trading and AFS securities	0
Trading and AFS securities | Default rate | Maximum
Assets
Trading and AFS securities	0.16
Trading and AFS securities | Default rate | Weighted Average
Assets
Trading and AFS securities	0.001
Trading and AFS securities | Loss severity | Minimum
Assets
Trading and AFS securities	0
Trading and AFS securities | Loss severity | Maximum
Assets
Trading and AFS securities	0.50
Trading and AFS securities | Loss severity | Weighted Average
Assets
Trading and AFS securities	0.18
Home Equity Investments (HEI)
Assets
Home Equity Investments (HEI)	$ 253,303
Home Equity Investments (HEI) | Prepayment rate (annual CPR) | Minimum
Assets
HEI, Measurement input	0.01
Home Equity Investments (HEI) | Prepayment rate (annual CPR) | Maximum
Assets
HEI, Measurement input	0.20
Home Equity Investments (HEI) | Prepayment rate (annual CPR) | Weighted Average
Assets
HEI, Measurement input	0.14
Home Equity Investments (HEI) | Default rate | Minimum
Assets
HEI, Measurement input	0.10
Home Equity Investments (HEI) | Default rate | Maximum
Assets
HEI, Measurement input	0.10
Home Equity Investments (HEI) | Default rate | Weighted Average
Assets
HEI, Measurement input	0.10
Home Equity Investments (HEI) | Home price appreciation (depreciation) | Minimum
Assets
HEI, Measurement input	0.04
Home Equity Investments (HEI) | Home price appreciation (depreciation) | Maximum
Assets
HEI, Measurement input	0.04
Home Equity Investments (HEI) | Home price appreciation (depreciation) | Weighted Average
Assets
HEI, Measurement input	0.04
HEI held by HEI securitization entities
Assets
Home Equity Investments (HEI)	$ 320,816
Servicer advance investments
Assets
Servicing asset	$ 227,363
Servicer advance investments | Minimum
Assets
Expected remaining life	5 years
Servicer advance investments | Maximum
Assets
Expected remaining life	5 years
Servicer advance investments | Weighted Average
Assets
Expected remaining life	5 years
Servicer advance investments | Prepayment rate (annual CPR) | Minimum
Assets
Servicing asset, measurement input	0.11
Servicer advance investments | Prepayment rate (annual CPR) | Maximum
Assets
Servicing asset, measurement input	0.30
Servicer advance investments | Prepayment rate (annual CPR) | Weighted Average
Assets
Servicing asset, measurement input	0.14
Servicer advance investments | Whole loan discount rate | Minimum
Assets
Servicing asset, measurement input	0.03
Servicer advance investments | Whole loan discount rate | Maximum
Assets
Servicing asset, measurement input	0.06
Servicer advance investments | Whole loan discount rate | Weighted Average
Assets
Servicing asset, measurement input	0.04
Servicer advance investments | Mortgage servicing income | Minimum
Assets
Loan purchase commitments, measurement input	0.0003
Servicer advance investments | Mortgage servicing income | Maximum
Assets
Loan purchase commitments, measurement input	0.0018
Servicer advance investments | Mortgage servicing income | Weighted Average
Assets
Loan purchase commitments, measurement input	0.0010
MSRs
Assets
Servicing asset	$ 28,653
MSRs | Prepayment rate (annual CPR) | Minimum
Assets
Servicing asset, measurement input	0.02
MSRs | Prepayment rate (annual CPR) | Maximum
Assets
Servicing asset, measurement input	0.16
MSRs | Prepayment rate (annual CPR) | Weighted Average
Assets
Servicing asset, measurement input	0.05
MSRs | Whole loan discount rate | Minimum
Assets
Servicing asset, measurement input	0.10
MSRs | Whole loan discount rate | Maximum
Assets
Servicing asset, measurement input	0.46
MSRs | Whole loan discount rate | Weighted Average
Assets
Servicing asset, measurement input	0.10
MSRs | Per loan annual cost to service | Minimum
Assets
Servicing asset, measurement input | $ / loan	93
MSRs | Per loan annual cost to service | Maximum
Assets
Servicing asset, measurement input | $ / loan	93
MSRs | Per loan annual cost to service | Weighted Average
Assets
Servicing asset, measurement input | $ / loan	93
Excess MSRs
Assets
Servicing asset	$ 34,754
Excess MSRs | Prepayment rate (annual CPR) | Minimum
Assets
Servicing asset, measurement input	0.10
Excess MSRs | Prepayment rate (annual CPR) | Maximum
Assets
Servicing asset, measurement input	1
Excess MSRs | Prepayment rate (annual CPR) | Weighted Average
Assets
Servicing asset, measurement input	0.17
Excess MSRs | Whole loan discount rate | Minimum
Assets
Servicing asset, measurement input	0.12
Excess MSRs | Whole loan discount rate | Maximum
Assets
Servicing asset, measurement input	0.19
Excess MSRs | Whole loan discount rate | Weighted Average
Assets
Servicing asset, measurement input	0.18
Excess MSRs | Excess mortgage servicing amount | Minimum
Assets
Servicing asset, measurement input	0.0008
Excess MSRs | Excess mortgage servicing amount | Maximum
Assets
Servicing asset, measurement input	0.0020
Excess MSRs | Excess mortgage servicing amount | Weighted Average
Assets
Servicing asset, measurement input	0.0011
Residential consumer loan purchase commitments, net
Assets
Loan purchase commitments, net	$ 3,670
Residential consumer loan purchase commitments, net | Senior credit spread to TBA price | Minimum
Assets
Loan purchase commitments, measurement input | $ / loan	1.13
Residential consumer loan purchase commitments, net | Senior credit spread to TBA price | Maximum
Assets
Loan purchase commitments, measurement input | $ / loan	2.00
Residential consumer loan purchase commitments, net | Senior credit spread to TBA price | Weighted Average
Assets
Loan purchase commitments, measurement input | $ / loan	1.21
Residential consumer loan purchase commitments, net | Senior credit support | Minimum
Assets
Loan purchase commitments, measurement input	0.07
Residential consumer loan purchase commitments, net | Senior credit support | Maximum
Assets
Loan purchase commitments, measurement input	0.07
Residential consumer loan purchase commitments, net | Senior credit support | Weighted Average
Assets
Loan purchase commitments, measurement input	0.07
Residential consumer loan purchase commitments, net | IO discount rate | Minimum
Assets
Loan purchase commitments, measurement input	0.20
Residential consumer loan purchase commitments, net | IO discount rate | Maximum
Assets
Loan purchase commitments, measurement input	0.20
Residential consumer loan purchase commitments, net | IO discount rate | Weighted Average
Assets
Loan purchase commitments, measurement input	0.20
Residential consumer loan purchase commitments, net | Prepayment rate (annual CPR) | Minimum
Assets
Loan purchase commitments, measurement input	0.15
Residential consumer loan purchase commitments, net | Prepayment rate (annual CPR) | Maximum
Assets
Loan purchase commitments, measurement input	0.15
Residential consumer loan purchase commitments, net | Prepayment rate (annual CPR) | Weighted Average
Assets
Loan purchase commitments, measurement input	0.15
Residential consumer loan purchase commitments, net | Pull-through rate | Minimum
Assets
Loan purchase commitments, measurement input	18
Residential consumer loan purchase commitments, net | Pull-through rate | Maximum
Assets
Loan purchase commitments, measurement input	100
Residential consumer loan purchase commitments, net | Pull-through rate | Weighted Average
Assets
Loan purchase commitments, measurement input	74
Residential consumer loan purchase commitments, net | Committed Sales Price | Minimum
Assets
Loan purchase commitments, measurement input | $ / loan	101
Residential consumer loan purchase commitments, net | Committed Sales Price | Maximum
Assets
Loan purchase commitments, measurement input | $ / loan	103
Residential consumer loan purchase commitments, net | Committed Sales Price | Weighted Average
Assets
Loan purchase commitments, measurement input | $ / loan	103
Residential consumer loan purchase commitments, net | Pull-through rate | Minimum
Assets
Loan purchase commitments, measurement input	0.0200
Residential consumer loan purchase commitments, net | Pull-through rate | Maximum
Assets
Loan purchase commitments, measurement input	0.0650
Residential consumer loan purchase commitments, net | Pull-through rate | Weighted Average
Assets
Loan purchase commitments, measurement input	0.0276
At consolidated CAFL Bridge entities
Liabilities
Fair value of securities owned	$ 25,000	$ 22,000

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- Definition

Debt Securities, Trading And Available-for-sale, Fair Value Disclosure

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Loan Purchase Commitments, Fair Value Disclosure

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Loans Held-for-Investment, Measurement Input

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- Definition

Loans Receivable, Measurement Input

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- Definition

Securitization Entity

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- Definition

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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/2009/role/commonPracticeRef
-Topic 820
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-Name Accounting Standards Codification
-Section 50
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 6: http://www.xbrl.org/2003/role/exampleRef
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