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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 | Sep. 30, 2020 USD ($) series | Dec. 31, 2019 USD ($) series
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt | $ 7,172,398,000 | $ 10,515,475,000
Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
Long-term debt | 198,057,000 | 197,110,000
Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | 6,792,029,000 | 9,962,253,000
Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 182,312,000 | 356,112,000
Legacy Sequoia |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 292,484,000 | $ 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 | $ (56,769,000) | $ (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 | 1.96% | 3.26%
Legacy Sequoia | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | $ 347,985,000 | $ 420,056,000
Legacy Sequoia | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 1,268,000 | 1,282,000
Sequoia Choice |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,626,564,000 | $ 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 | $ 48,045,000 | $ 40,965,000
Sequoia Choice | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 2.23% | 4.40%
Sequoia Choice | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 5.02% | 5.05%
Sequoia Choice | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | $ 1,571,714,000 | $ 1,979,719,000
Sequoia Choice | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 6,805,000 | 16,514,000
Freddie Mac SLST |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 2,044,335,000 | $ 1,918,322,000
Range of weighted average interest rates, by series |  | 3.50%
Number of series | series | 3 | 2
Debt instrument, face amount | $ 208,000,000 |
Freddie Mac SLST | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 95,138,000 | $ 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 | $ 1,925,144,000 | 1,842,682,000
Freddie Mac SLST | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 24,053,000 | 30,291,000
Freddie Mac K-Series |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 464,865,000 | $ 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 | $ 33,531,000 | $ 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 | 418,212,000 | $ 3,844,789,000
Freddie Mac K-Series | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 13,122,000 | 217,891,000
CAFL |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 2,744,150,000 | $ 2,001,251,000
Number of series | series | 13 | 10
CAFL | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 78,112,000 | $ 36,110,000
CAFL | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 3.18% | 3.25%
CAFL | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 5.53% | 5.36%
CAFL | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | $ 2,528,974,000 | $ 1,875,007,000
CAFL | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | $ 137,064,000 | $ 90,134,000

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