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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) - Asset-backed securities issued	Mar. 31, 2022 USD ($) series	Dec. 31, 2021 USD ($) series
Debt Instrument [Line Items]
ABS Issued, Net	$ 8,872,366,000	$ 9,253,557,000
Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	(491,704,000)	34,092,000
Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	9,118,542,000	8,970,474,000
Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	245,528,000	248,991,000
Legacy Sequoia
Debt Instrument [Line Items]
ABS Issued, Net	$ 220,301,000	$ 227,881,000
Number of series | series	20	20
Legacy Sequoia | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (23,899,000)	$ (32,243,000)
Legacy Sequoia | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series	0.57%	0.23%
Legacy Sequoia | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series	2.05%	1.44%
Legacy Sequoia | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	$ 243,879,000	$ 259,505,000
Legacy Sequoia | Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	321,000	619,000
Sequoia
Debt Instrument [Line Items]
ABS Issued, Net	$ 3,627,920,000	$ 3,383,048,000
Number of series | series	17	16
Sequoia | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (288,847,000)	$ (2,774,000)
Sequoia | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series	2.46%	2.40%
Sequoia | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series	5.03%	5.03%
Sequoia | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	$ 3,868,206,000	$ 3,353,073,000
Sequoia | Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	48,561,000	32,749,000
CAFL
Debt Instrument [Line Items]
ABS Issued, Net	$ 3,012,841,000	$ 3,474,898,000
Number of series | series	16	16
CAFL | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (156,196,000)	$ 16,407,000
CAFL | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series	2.64%	2.64%
CAFL | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series	5.44%	5.24%
CAFL | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	$ 2,998,376,000	$ 3,264,766,000
CAFL | Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	170,661,000	193,725,000
Freddie Mac SLST
Debt Instrument [Line Items]
ABS Issued, Net	$ 1,470,043,000	$ 1,588,463,000
Number of series | series	3	3
Debt instrument, face amount	$ 131,000,000	$ 145,000,000
Freddie Mac SLST | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (9,956,000)	$ 41,111,000
Freddie Mac SLST | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series	3.50%	3.50%
Freddie Mac SLST | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series	4.75%	4.75%
Freddie Mac SLST | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	$ 1,463,505,000	$ 1,535,638,000
Freddie Mac SLST | Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	16,494,000	11,714,000
Freddie Mac K-Series
Debt Instrument [Line Items]
ABS Issued, Net	$ 419,883,000	$ 441,857,000
Range of weighted average interest rates, by series	3.55%	3.41%
Number of series | series	1	1
Freddie Mac K-Series | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (6,280,000)	$ 12,973,000
Freddie Mac K-Series | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	416,672,000	418,700,000
Freddie Mac K-Series | Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	9,491,000	10,184,000
HEI
Debt Instrument [Line Items]
ABS Issued, Net	$ 121,378,000	$ 137,410,000
Range of weighted average interest rates, by series	3.27%	3.31%
Number of series | series	1	1
HEI | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (6,526,000)	$ (1,382,000)
HEI | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	127,904,000	138,792,000
HEI | Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	0	0
CoreVest
Debt Instrument [Line Items]
Debt instrument, face amount	$ 270,000,000	$ 270,000,000

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