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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 | Dec. 31, 2020 USD ($) series | Dec. 31, 2019 USD ($) series
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt | $ 7,100,661,000 | $ 10,515,475,000
Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
Long-term debt | 257,778,000 | 197,110,000
Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | 6,637,905,000 | 9,962,253,000
Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 204,978,000 | 356,112,000
Legacy Sequoia |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 282,326,000 | $ 402,465,000
Number of series | series | 20 | 20
Legacy Sequoia | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ (47,805,000) | $ (18,873,000)
Legacy Sequoia | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 0.35% | 1.94%
Legacy Sequoia | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 1.55% | 3.26%
Legacy Sequoia | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | $ 329,039,000 | $ 420,056,000
Legacy Sequoia | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 1,092,000 | 1,282,000
Sequoia Choice |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,347,357,000 | $ 2,037,198,000
Number of series | series | 10 | 9
Sequoia Choice | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 32,809,000 | $ 40,965,000
Sequoia Choice | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 2.25% | 4.40%
Sequoia Choice | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 5.04% | 5.05%
Sequoia Choice | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | $ 1,309,957,000 | $ 1,979,719,000
Sequoia Choice | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 4,591,000 | 16,514,000
Freddie Mac SLST |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,993,919,000 | $ 1,918,322,000
Range of weighted average interest rates, by series |  | 3.50%
Number of series | series | 3 | 2
Debt instrument, face amount | $ 205,000,000 |
Freddie Mac SLST | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 104,439,000 | $ 45,349,000
Freddie Mac SLST | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 3.50% |
Freddie Mac SLST | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 4.75% |
Freddie Mac SLST | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | $ 1,866,145,000 | 1,842,682,000
Freddie Mac SLST | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 23,335,000 | 30,291,000
Freddie Mac K-Series |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 463,966,000 | $ 4,156,239,000
Range of weighted average interest rates, by series | 3.39% |
Number of series | series | 1 | 5
Freddie Mac K-Series | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 34,601,000 | $ 93,559,000
Freddie Mac K-Series | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series |  | 3.35%
Freddie Mac K-Series | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series |  | 4.35%
Freddie Mac K-Series | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | 416,339,000 | $ 3,844,789,000
Freddie Mac K-Series | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 13,026,000 | 217,891,000
CAFL |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 3,013,093,000 | $ 2,001,251,000
Number of series | series | 14 | 10
CAFL | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 133,734,000 | $ 36,110,000
CAFL | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 2.68% | 3.25%
CAFL | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 5.42% | 5.36%
CAFL | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | $ 2,716,425,000 | $ 1,875,007,000
CAFL | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | $ 162,934,000 | $ 90,134,000

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