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Asset-Backed Securities Issued - Components of Asset-Backed Securities Issued by Consolidated Securitization Entities Sponsored, Along With Other Selected Information (Details)	Dec. 31, 2021 USD ($) series	Dec. 31, 2020 USD ($) series
Debt Instrument [Line Items]
Certificates	$ 1,650,576,000	$ 1,441,331,000
Long-term debt	1,640,833,000	1,425,485,000
Asset-backed securities issued
Debt Instrument [Line Items]
Long-term debt	9,253,557,000	7,100,661,000
Asset-backed securities issued | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
Long-term debt	34,092,000	257,778,000
Asset-backed securities issued | Certificates with principal balance
Debt Instrument [Line Items]
Certificates	8,970,474,000	6,637,905,000
Asset-backed securities issued | Interest-only certificates
Debt Instrument [Line Items]
Certificates	248,991,000	204,978,000
Asset-backed securities issued | Legacy Sequoia
Debt Instrument [Line Items]
Long-term debt	$ 227,881,000	$ 282,326,000
Number of Series | series	20	20
Asset-backed securities issued | Legacy Sequoia | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
Long-term debt	$ (32,243,000)	$ (47,805,000)
Asset-backed securities issued | Legacy Sequoia | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	0.23%	0.35%
Asset-backed securities issued | Legacy Sequoia | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	1.44%	1.55%
Asset-backed securities issued | Legacy Sequoia | Certificates with principal balance
Debt Instrument [Line Items]
Certificates	$ 259,505,000	$ 329,039,000
Asset-backed securities issued | Legacy Sequoia | Interest-only certificates
Debt Instrument [Line Items]
Certificates	619,000	1,092,000
Asset-backed securities issued | Sequoia
Debt Instrument [Line Items]
Long-term debt	$ 3,383,048,000	$ 1,347,357,000
Number of Series | series	16	10
Asset-backed securities issued | Sequoia | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
Long-term debt	$ (2,774,000)	$ 32,809,000
Asset-backed securities issued | Sequoia | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	2.40%	2.25%
Asset-backed securities issued | Sequoia | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	5.03%	5.04%
Asset-backed securities issued | Sequoia | Certificates with principal balance
Debt Instrument [Line Items]
Certificates	$ 3,353,073,000	$ 1,309,957,000
Asset-backed securities issued | Sequoia | Interest-only certificates
Debt Instrument [Line Items]
Certificates	32,749,000	4,591,000
Asset-backed securities issued | CAFL(1)
Debt Instrument [Line Items]
Long-term debt	$ 3,474,898,000	$ 3,013,093,000
Number of Series | series	16	14
Asset-backed securities issued | CAFL(1) | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
Long-term debt	$ 16,407,000	$ 133,734,000
Asset-backed securities issued | CAFL(1) | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	2.64%	2.68%
Asset-backed securities issued | CAFL(1) | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	5.24%	5.42%
Asset-backed securities issued | CAFL(1) | Certificates with principal balance
Debt Instrument [Line Items]
Certificates	$ 3,264,766,000	$ 2,716,425,000
Asset-backed securities issued | CAFL(1) | Interest-only certificates
Debt Instrument [Line Items]
Certificates	193,725,000	162,934,000
Asset-backed securities issued | Freddie Mac SLST(1)
Debt Instrument [Line Items]
Long-term debt	$ 1,588,463,000	$ 1,993,919,000
Number of Series | series	3	3
Debt instrument, face amount	$ 145,000,000	$ 205,000,000
Asset-backed securities issued | Freddie Mac SLST(1) | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
Long-term debt	$ 41,111,000	$ 104,439,000
Asset-backed securities issued | Freddie Mac SLST(1) | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	3.50%	3.50%
Asset-backed securities issued | Freddie Mac SLST(1) | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	4.75%	4.75%
Asset-backed securities issued | Freddie Mac SLST(1) | Certificates with principal balance
Debt Instrument [Line Items]
Certificates	$ 1,535,638,000	$ 1,866,145,000
Asset-backed securities issued | Freddie Mac SLST(1) | Interest-only certificates
Debt Instrument [Line Items]
Certificates	11,714,000	23,335,000
Asset-backed securities issued | Freddie Mac K-Series
Debt Instrument [Line Items]
Long-term debt	$ 441,857,000	$ 463,966,000
Range of weighted average interest rates, by series (as a percent)	3.41%
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]
Long-term debt	$ 12,973,000	$ 34,601,000
Asset-backed securities issued | Freddie Mac K-Series | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)		3.39%
Asset-backed securities issued | Freddie Mac K-Series | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)		3.39%
Asset-backed securities issued | Freddie Mac K-Series | Certificates with principal balance
Debt Instrument [Line Items]
Certificates	418,700,000	$ 416,339,000
Asset-backed securities issued | Freddie Mac K-Series | Interest-only certificates
Debt Instrument [Line Items]
Certificates	10,184,000	13,026,000
Asset-backed securities issued | Point HEI
Debt Instrument [Line Items]
Long-term debt	$ 137,410,000	$ 0
Range of weighted average interest rates, by series (as a percent)	3.31%
Number of Series | series	1	0
Asset-backed securities issued | Point HEI | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
Long-term debt	$ (1,382,000)	$ 0
Asset-backed securities issued | Point HEI | Certificates with principal balance
Debt Instrument [Line Items]
Certificates	138,792,000	0
Asset-backed securities issued | Point HEI | Interest-only certificates
Debt Instrument [Line Items]
Certificates	0	$ 0
Asset-backed securities issued | CoreVest
Debt Instrument [Line Items]
Debt instrument, face amount	$ 270,000,000

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