Asset-Backed Securities Issued - Components of Asset-Backed Securities Issued by Consolidated Securitization Entities Sponsored, Along With Other Selected Information (Details) $ in Thousands	Mar. 31, 2024 USD ($) series trust	Dec. 31, 2023 USD ($) series trust
CAFL
Debt Instrument [Line Items]
Number of bridge securitization trusts | trust	2	2
Asset-backed securities issued
Debt Instrument [Line Items]
ABS Issued, Net	$ 10,628,189	$ 9,811,880
Asset-backed securities issued | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	(1,007,233)	(943,370)
Asset-backed securities issued | Deferred Debt Issuance Costs
Debt Instrument [Line Items]
Unamortized debt discount and deferred debt issuance costs	(4,107)	(5,929)
Asset-backed securities issued | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	11,474,801	10,588,659
Asset-backed securities issued | Interest-only certificates at fair value
Debt Instrument [Line Items]
ABS Issued, Net	164,728	172,520
Asset-backed securities issued | Legacy Sequoia
Debt Instrument [Line Items]
ABS Issued, Net	$ 130,875	$ 138,530
Number of series | series	20	20
Asset-backed securities issued | Legacy Sequoia | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (10,933)	$ (12,738)
Asset-backed securities issued | Legacy Sequoia | Deferred Debt Issuance Costs
Debt Instrument [Line Items]
Unamortized debt discount and deferred debt issuance costs	$ 0	$ 0
Asset-backed securities issued | Legacy Sequoia | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	3.75%	3.59%
Asset-backed securities issued | Legacy Sequoia | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	6.69%	6.66%
Asset-backed securities issued | Legacy Sequoia | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	$ 141,686	$ 151,106
Asset-backed securities issued | Legacy Sequoia | Interest-only certificates at fair value
Debt Instrument [Line Items]
ABS Issued, Net	122	162
Asset-backed securities issued | Sequoia
Debt Instrument [Line Items]
ABS Issued, Net	$ 5,423,137	$ 4,430,130
Number of series | series	25	22
Asset-backed securities issued | Sequoia | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (691,532)	$ (622,522)
Asset-backed securities issued | Sequoia | Deferred Debt Issuance Costs
Debt Instrument [Line Items]
Unamortized debt discount and deferred debt issuance costs	$ 0	$ 0
Asset-backed securities issued | Sequoia | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	2.67%	2.67%
Asset-backed securities issued | Sequoia | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	6.23%	6.24%
Asset-backed securities issued | Sequoia | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	$ 6,060,855	$ 5,000,540
Asset-backed securities issued | Sequoia | Interest-only certificates at fair value
Debt Instrument [Line Items]
ABS Issued, Net	53,814	52,112
Asset-backed securities issued | CAFL
Debt Instrument [Line Items]
ABS Issued, Net	$ 3,228,804	$ 3,362,978
Number of series | series	21	21
Asset-backed securities issued | CAFL | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (204,149)	$ (209,740)
Asset-backed securities issued | CAFL | Deferred Debt Issuance Costs
Debt Instrument [Line Items]
Unamortized debt discount and deferred debt issuance costs	$ (575)	$ (1,935)
Asset-backed securities issued | CAFL | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	2.31%	2.34%
Asset-backed securities issued | CAFL | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	7.89%	7.89%
Asset-backed securities issued | CAFL | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	$ 3,339,432	$ 3,472,825
Asset-backed securities issued | CAFL | Interest-only certificates at fair value
Debt Instrument [Line Items]
ABS Issued, Net	94,096	101,828
Asset-backed securities issued | Freddie Mac SLST
Debt Instrument [Line Items]
ABS Issued, Net	$ 1,235,810	$ 1,265,777
Range of weighted average interest rates, by series (as a percent)	3.50%
Number of series | series	3	3
Debt instrument, face amount	$ 175,000	$ 182,000
Asset-backed securities issued | Freddie Mac SLST | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	(79,468)	(72,742)
Asset-backed securities issued | Freddie Mac SLST | Deferred Debt Issuance Costs
Debt Instrument [Line Items]
Unamortized debt discount and deferred debt issuance costs	$ (3,532)	$ (3,994)
Asset-backed securities issued | Freddie Mac SLST | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)		3.50%
Asset-backed securities issued | Freddie Mac SLST | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	7.50%	7.50%
Asset-backed securities issued | Freddie Mac SLST | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	$ 1,305,826	$ 1,328,657
Asset-backed securities issued | Freddie Mac SLST | Interest-only certificates at fair value
Debt Instrument [Line Items]
ABS Issued, Net	12,984	13,856
Asset-backed securities issued | Freddie Mac K-Series
Debt Instrument [Line Items]
ABS Issued, Net	$ 389,238	$ 391,977
Range of weighted average interest rates, by series (as a percent)	3.55%	3.55%
Number of series | series	1	1
Asset-backed securities issued | Freddie Mac K-Series | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (14,724)	$ (14,985)
Asset-backed securities issued | Freddie Mac K-Series | Deferred Debt Issuance Costs
Debt Instrument [Line Items]
Unamortized debt discount and deferred debt issuance costs	0	0
Asset-backed securities issued | Freddie Mac K-Series | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	400,250	402,400
Asset-backed securities issued | Freddie Mac K-Series | Interest-only certificates at fair value
Debt Instrument [Line Items]
ABS Issued, Net	3,712	4,562
Asset-backed securities issued | HEI
Debt Instrument [Line Items]
ABS Issued, Net	$ 220,325	$ 222,488
Number of series | series	2	2
Asset-backed securities issued | HEI | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (6,427)	$ (10,643)
Asset-backed securities issued | HEI | Deferred Debt Issuance Costs
Debt Instrument [Line Items]
Unamortized debt discount and deferred debt issuance costs	$ 0	$ 0
Asset-backed securities issued | HEI | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	3.88%	3.86%
Asset-backed securities issued | HEI | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	6.71%	6.70%
Asset-backed securities issued | HEI | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	$ 226,752	$ 233,131
Asset-backed securities issued | HEI | Interest-only certificates at fair value
Debt Instrument [Line Items]
ABS Issued, Net	0	0
Asset-backed securities issued | CoreVest
Debt Instrument [Line Items]
Debt instrument, face amount	$ 478,000	$ 485,000