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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 $ in Thousands	Sep. 30, 2022 USD ($) series	Dec. 31, 2021 USD ($) series
Debt Instrument [Line Items]
ABS Issued, Net	$ 8,139,293	$ 9,253,557
Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	(1,189,091)	34,092
Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	9,109,550	8,970,474
Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	218,834	248,991
Legacy Sequoia
Debt Instrument [Line Items]
ABS Issued, Net	$ 197,354	$ 227,881
Number of series | series	20	20
Legacy Sequoia | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (16,602)	$ (32,243)
Legacy Sequoia | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series	2.52%	0.23%
Legacy Sequoia | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series	3.90%	1.44%
Legacy Sequoia | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	$ 213,786	$ 259,505
Legacy Sequoia | Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	170	619
Sequoia
Debt Instrument [Line Items]
ABS Issued, Net	$ 3,013,249	$ 3,383,048
Number of series | series	17	16
Sequoia | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (699,473)	$ (2,774)
Sequoia | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series	2.56%	2.40%
Sequoia | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series	4.99%	5.03%
Sequoia | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	$ 3,650,411	$ 3,353,073
Sequoia | Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	62,311	32,749
CAFL
Debt Instrument [Line Items]
ABS Issued, Net	$ 3,179,487	$ 3,474,898
Number of series | series	19	16
CAFL | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (330,549)	$ 16,407
CAFL | Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series	2.34%	2.64%
CAFL | Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series	5.93%	5.24%
CAFL | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	$ 3,375,688	$ 3,264,766
CAFL | Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	134,348	193,725
Freddie Mac SLST
Debt Instrument [Line Items]
ABS Issued, Net	$ 1,249,041	$ 1,588,463
Number of series | series	3	3
Debt instrument, face amount	$ 100,000	$ 145,000
Freddie Mac SLST | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (109,410)	$ 41,111
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	$ 1,344,521	$ 1,535,638
Freddie Mac SLST | Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	13,930	11,714
Freddie Mac K-Series
Debt Instrument [Line Items]
ABS Issued, Net	$ 395,411	$ 441,857
Range of weighted average interest rates, by series	3.41%	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	$ (25,428)	$ 12,973
Freddie Mac K-Series | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	412,764	418,700
Freddie Mac K-Series | Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	8,075	10,184
HEI
Debt Instrument [Line Items]
ABS Issued, Net	$ 104,751	$ 137,410
Range of weighted average interest rates, by series	3.76%	3.31%
Number of series | series	1	1
HEI | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (7,629)	$ (1,382)
HEI | Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	112,380	138,792
HEI | Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	0	0
CoreVest
Debt Instrument [Line Items]
Debt instrument, face amount	$ 485,000	$ 270,000

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