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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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