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	Jun. 30, 2023 USD ($) series	Dec. 31, 2022 USD ($) series
Debt Instrument [Line Items]
ABS Issued, Net	$ 8,183,170	$ 7,986,752
Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	(1,144,251)	(1,163,285)
Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	9,153,700	8,944,351
Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	173,721	205,686
Legacy Sequoia
Debt Instrument [Line Items]
ABS Issued, Net	$ 162,049	$ 184,191
Number of series \| series	20	20
Legacy Sequoia \| Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (9,181)	$ (16,036)
Legacy Sequoia \| Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	0.00%	2.69%
Legacy Sequoia \| Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	7.02%	5.19%
Legacy Sequoia \| Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	$ 171,068	$ 200,047
Legacy Sequoia \| Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	162	180
Sequoia
Debt Instrument [Line Items]
ABS Issued, Net	$ 3,485,390	$ 2,971,109
Number of series \| series	19	17
Sequoia \| Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (689,517)	$ (682,477)
Sequoia \| Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	2.63%	2.57%
Sequoia \| Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	5.01%	6.13%
Sequoia \| Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	$ 4,125,715	$ 3,595,715
Sequoia \| Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	49,192	57,871
CAFL
Debt Instrument [Line Items]
ABS Issued, Net	$ 2,955,520	$ 3,115,807
Number of series \| series	19	19
CAFL \| Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (310,155)	$ (331,371)
CAFL \| Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	2.34%	2.34%
CAFL \| Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)	6.19%	5.92%
CAFL \| Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	$ 3,161,740	$ 3,322,250
CAFL \| Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	103,935	124,928
Freddie Mac SLST
Debt Instrument [Line Items]
ABS Issued, Net	$ 1,096,972	$ 1,222,150
Range of weighted average interest rates, by series (as a percent)	3.50%
Number of series \| series	2	3
Debt instrument, face amount		$ 86,000
Freddie Mac SLST \| Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (101,866)	$ (99,830)
Freddie Mac SLST \| Minimum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)		3.50%
Freddie Mac SLST \| Maximum
Debt Instrument [Line Items]
Range of weighted average interest rates, by series (as a percent)		4.75%
Freddie Mac SLST \| Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	1,184,425	$ 1,306,652
Freddie Mac SLST \| Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	14,413	15,328
Freddie Mac K-Series
Debt Instrument [Line Items]
ABS Issued, Net	$ 387,581	$ 392,785
Range of weighted average interest rates, by series (as a percent)	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	$ (25,019)	$ (25,319)
Freddie Mac K-Series \| Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	406,581	410,725
Freddie Mac K-Series \| Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	6,019	7,379
HEI
Debt Instrument [Line Items]
ABS Issued, Net	$ 95,658	$ 100,710
Range of weighted average interest rates, by series (as a percent)	3.82%	3.78%
Number of series \| series	1	1
HEI \| Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
ABS Issued, Net	$ (8,513)	$ (8,252)
HEI \| Certificates with principal balance
Debt Instrument [Line Items]
ABS Issued, Net	104,171	108,962
HEI \| Interest-only certificates
Debt Instrument [Line Items]
ABS Issued, Net	0	0
CoreVest
Debt Instrument [Line Items]
Debt instrument, face amount	$ 485,000	$ 485,000

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