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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, 2022
USD ($)
series
trust
Dec. 31, 2021
USD ($)
series
CAFL    
Debt Instrument [Line Items]    
Number of bridge securitization trusts | trust 2  
Asset-backed securities issued    
Debt Instrument [Line Items]    
ABS Issued, Net $ 7,986,752,000 $ 9,253,557,000
Asset-backed securities issued | Revision of Prior Period, Accounting Standards Update, Adjustment    
Debt Instrument [Line Items]    
ABS Issued, Net (1,163,285,000) 34,092,000
Asset-backed securities issued | Certificates with principal balance    
Debt Instrument [Line Items]    
ABS Issued, Net 8,944,351,000 8,970,474,000
Asset-backed securities issued | Interest-only certificates    
Debt Instrument [Line Items]    
ABS Issued, Net 205,686,000 248,991,000
Asset-backed securities issued | Legacy Sequoia    
Debt Instrument [Line Items]    
ABS Issued, Net $ 184,191,000 $ 227,881,000
Number of Series | series 20 20
Asset-backed securities issued | Legacy Sequoia | Revision of Prior Period, Accounting Standards Update, Adjustment    
Debt Instrument [Line Items]    
ABS Issued, Net $ (16,036,000) $ (32,243,000)
Asset-backed securities issued | Legacy Sequoia | Minimum    
Debt Instrument [Line Items]    
Range of weighted average interest rates, by series (as a percent) 2.69% 0.23%
Asset-backed securities issued | Legacy Sequoia | Maximum    
Debt Instrument [Line Items]    
Range of weighted average interest rates, by series (as a percent) 5.19% 1.44%
Asset-backed securities issued | Legacy Sequoia | Certificates with principal balance    
Debt Instrument [Line Items]    
ABS Issued, Net $ 200,047,000 $ 259,505,000
Asset-backed securities issued | Legacy Sequoia | Interest-only certificates    
Debt Instrument [Line Items]    
ABS Issued, Net 180,000 619,000
Asset-backed securities issued | Sequoia    
Debt Instrument [Line Items]    
ABS Issued, Net $ 2,971,109,000 $ 3,383,048,000
Number of Series | series 17 16
Asset-backed securities issued | Sequoia | Revision of Prior Period, Accounting Standards Update, Adjustment    
Debt Instrument [Line Items]    
ABS Issued, Net $ (682,477,000) $ (2,774,000)
Asset-backed securities issued | Sequoia | Minimum    
Debt Instrument [Line Items]    
Range of weighted average interest rates, by series (as a percent) 2.57% 2.40%
Asset-backed securities issued | Sequoia | Maximum    
Debt Instrument [Line Items]    
Range of weighted average interest rates, by series (as a percent) 6.13% 5.03%
Asset-backed securities issued | Sequoia | Certificates with principal balance    
Debt Instrument [Line Items]    
ABS Issued, Net $ 3,595,715,000 $ 3,353,073,000
Asset-backed securities issued | Sequoia | Interest-only certificates    
Debt Instrument [Line Items]    
ABS Issued, Net 57,871,000 32,749,000
Asset-backed securities issued | CAFL    
Debt Instrument [Line Items]    
ABS Issued, Net $ 3,115,807,000 $ 3,474,898,000
Number of Series | series 19 16
Asset-backed securities issued | CAFL | Revision of Prior Period, Accounting Standards Update, Adjustment    
Debt Instrument [Line Items]    
ABS Issued, Net $ (331,371,000) $ 16,407,000
Asset-backed securities issued | CAFL | Minimum    
Debt Instrument [Line Items]    
Range of weighted average interest rates, by series (as a percent) 2.34% 2.64%
Asset-backed securities issued | CAFL | Maximum    
Debt Instrument [Line Items]    
Range of weighted average interest rates, by series (as a percent) 5.92% 5.24%
Asset-backed securities issued | CAFL | Certificates with principal balance    
Debt Instrument [Line Items]    
ABS Issued, Net $ 3,322,250,000 $ 3,264,766,000
Asset-backed securities issued | CAFL | Interest-only certificates    
Debt Instrument [Line Items]    
ABS Issued, Net 124,928,000 193,725,000
Asset-backed securities issued | Freddie Mac SLST    
Debt Instrument [Line Items]    
ABS Issued, Net $ 1,222,150,000 $ 1,588,463,000
Number of Series | series 3 3
Debt instrument, face amount $ 86,000,000 $ 145,000,000
Asset-backed securities issued | Freddie Mac SLST | Revision of Prior Period, Accounting Standards Update, Adjustment    
Debt Instrument [Line Items]    
ABS Issued, Net $ (99,830,000) $ 41,111,000
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% 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) 4.75% 4.75%
Asset-backed securities issued | Freddie Mac SLST | Certificates with principal balance    
Debt Instrument [Line Items]    
ABS Issued, Net $ 1,306,652,000 $ 1,535,638,000
Asset-backed securities issued | Freddie Mac SLST | Interest-only certificates    
Debt Instrument [Line Items]    
ABS Issued, Net 15,328,000 11,714,000
Asset-backed securities issued | Freddie Mac K-Series    
Debt Instrument [Line Items]    
ABS Issued, Net $ 392,785,000 $ 441,857,000
Range of weighted average interest rates, by series (as a percent) 3.41% 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]    
ABS Issued, Net $ (25,319,000) $ 12,973,000
Asset-backed securities issued | Freddie Mac K-Series | Certificates with principal balance    
Debt Instrument [Line Items]    
ABS Issued, Net 410,725,000 418,700,000
Asset-backed securities issued | Freddie Mac K-Series | Interest-only certificates    
Debt Instrument [Line Items]    
ABS Issued, Net 7,379,000 10,184,000
Asset-backed securities issued | HEI    
Debt Instrument [Line Items]    
ABS Issued, Net $ 100,710,000 $ 137,410,000
Range of weighted average interest rates, by series (as a percent) 3.78% 3.31%
Number of Series | series 1 1
Asset-backed securities issued | HEI | Revision of Prior Period, Accounting Standards Update, Adjustment    
Debt Instrument [Line Items]    
ABS Issued, Net $ (8,252,000) $ (1,382,000)
Asset-backed securities issued | HEI | Certificates with principal balance    
Debt Instrument [Line Items]    
ABS Issued, Net 108,962,000 138,792,000
Asset-backed securities issued | HEI | Interest-only certificates    
Debt Instrument [Line Items]    
ABS Issued, Net 0 0
Asset-backed securities issued | CoreVest    
Debt Instrument [Line Items]    
Debt instrument, face amount $ 485,000,000 $ 270,000,000