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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) | Mar. 31, 2021 USD ($) series | Dec. 31, 2020 USD ($) series
--- | --- | ---
Debt Instrument [Line Items] |  |
Certificates | $ 1,451,713,000 |
Net Carrying Value | 1,438,262,000 |
Asset-backed securities issued |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | 6,671,677,000 | $ 7,100,661,000
Asset-backed securities issued | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | 192,323,000 | 257,778,000
Asset-backed securities issued | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | 6,287,553,000 | 6,637,905,000
Asset-backed securities issued | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 191,801,000 | 204,978,000
Asset-backed securities issued | Legacy Sequoia |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | $ 271,915,000 | $ 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] |  |
Net Carrying Value | $ (38,820,000) | $ (47,805,000)
Asset-backed securities issued | Legacy Sequoia | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 0.32% | 0.35%
Asset-backed securities issued | Legacy Sequoia | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 1.47% | 1.55%
Asset-backed securities issued | Legacy Sequoia | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | $ 309,916,000 | $ 329,039,000
Asset-backed securities issued | Legacy Sequoia | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 819,000 | 1,092,000
Asset-backed securities issued | Sequoia Choice |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | $ 1,054,005,000 | $ 1,347,357,000
Number of series | series | 10 | 10
Asset-backed securities issued | Sequoia Choice | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | $ 27,650,000 | $ 32,809,000
Asset-backed securities issued | Sequoia Choice | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 2.28% | 2.25%
Asset-backed securities issued | Sequoia Choice | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 5.06% | 5.04%
Asset-backed securities issued | Sequoia Choice | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | $ 1,024,081,000 | $ 1,309,957,000
Asset-backed securities issued | Sequoia Choice | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 2,274,000 | 4,591,000
Asset-backed securities issued | Freddie Mac SLST |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | $ 1,921,440,000 | $ 1,993,919,000
Number of series | series | 3 | 3
Debt instrument, face amount | $ 200,000,000 | $ 205,000,000
Asset-backed securities issued | Freddie Mac SLST | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | $ 97,670,000 | $ 104,439,000
Asset-backed securities issued | Freddie Mac SLST | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 3.50% | 3.50%
Asset-backed securities issued | Freddie Mac SLST | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 4.75% | 4.75%
Asset-backed securities issued | Freddie Mac SLST | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | $ 1,800,808,000 | $ 1,866,145,000
Asset-backed securities issued | Freddie Mac SLST | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 22,962,000 | 23,335,000
Asset-backed securities issued | Freddie Mac K-Series |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | $ 460,565,000 | $ 463,966,000
Range of weighted average interest rates, by series | 3.41% | 3.39%
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] |  |
Net Carrying Value | $ 23,846,000 | $ 34,601,000
Asset-backed securities issued | Freddie Mac K-Series | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | 424,393,000 | 416,339,000
Asset-backed securities issued | Freddie Mac K-Series | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 12,326,000 | 13,026,000
Asset-backed securities issued | CAFL |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | $ 2,963,752,000 | $ 3,013,093,000
Number of series | series | 14 | 14
Asset-backed securities issued | CAFL | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | $ 81,977,000 | $ 133,734,000
Asset-backed securities issued | CAFL | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 2.63% | 2.68%
Asset-backed securities issued | CAFL | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 5.56% | 5.42%
Asset-backed securities issued | CAFL | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | $ 2,728,355,000 | $ 2,716,425,000
Asset-backed securities issued | CAFL | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | $ 153,420,000 | $ 162,934,000

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