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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) | Sep. 30, 2021 USD ($) series | Dec. 31, 2020 USD ($) series
--- | --- | ---
Debt Instrument [Line Items] |  |
Certificates | $ 1,510,056,000 |
Net Carrying Value | 1,499,577,000 |
Asset-backed securities issued |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | 8,183,825,000 | $ 7,100,661,000
Asset-backed securities issued | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | 136,848,000 | 257,778,000
Asset-backed securities issued | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | 7,804,617,000 | 6,637,905,000
Asset-backed securities issued | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 242,360,000 | 204,978,000
Asset-backed securities issued | Legacy Sequoia |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | $ 239,447,000 | $ 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 | $ (35,249,000) | $ (47,805,000)
Asset-backed securities issued | Legacy Sequoia | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 0.49% | 0.35%
Asset-backed securities issued | Legacy Sequoia | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 1.45% | 1.55%
Asset-backed securities issued | Legacy Sequoia | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | $ 273,957,000 | $ 329,039,000
Asset-backed securities issued | Legacy Sequoia | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 739,000 | 1,092,000
Asset-backed securities issued | Sequoia |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | $ 2,243,299,000 | $ 1,347,357,000
Number of series | series | 13 | 10
Asset-backed securities issued | Sequoia | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | $ 22,808,000 | $ 32,809,000
Asset-backed securities issued | Sequoia | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 2.34% | 2.25%
Asset-backed securities issued | Sequoia | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 5.07% | 5.04%
Asset-backed securities issued | Sequoia | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | $ 2,199,488,000 | $ 1,309,957,000
Asset-backed securities issued | Sequoia | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 21,003,000 | 4,591,000
Asset-backed securities issued | CAFL |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | $ 3,393,576,000 | $ 3,013,093,000
Number of series | series | 16 | 14
Asset-backed securities issued | CAFL | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | $ 68,684,000 | $ 133,734,000
Asset-backed securities issued | CAFL | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 2.34% | 2.68%
Asset-backed securities issued | CAFL | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series | 5.21% | 5.42%
Asset-backed securities issued | CAFL | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | $ 3,134,946,000 | $ 2,716,425,000
Asset-backed securities issued | CAFL | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 189,946,000 | 162,934,000
Asset-backed securities issued | Freddie Mac SLST |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | $ 1,710,664,000 | $ 1,993,919,000
Number of series | series | 3 | 3
Debt instrument, face amount | $ 163,000,000 | $ 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 | $ 60,625,000 | $ 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 | $ 1,630,252,000 | $ 1,866,145,000
Asset-backed securities issued | Freddie Mac SLST | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 19,787,000 | 23,335,000
Asset-backed securities issued | Freddie Mac K-Series |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | $ 451,402,000 | $ 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 | $ 19,863,000 | $ 34,601,000
Asset-backed securities issued | Freddie Mac K-Series | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | 420,654,000 | 416,339,000
Asset-backed securities issued | Freddie Mac K-Series | Interest-only certificates |  |
Debt Instrument [Line Items] |  |
Certificates | 10,885,000 | 13,026,000
Asset-backed securities issued | Point HEI |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | $ 145,437,000 | $ 0
Range of weighted average interest rates, by series | 3.27% | 0.00%
Number of series | series | 1 | 0
Asset-backed securities issued | Point HEI | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
Net Carrying Value | $ 117,000 | $ 0
Asset-backed securities issued | Point HEI | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
Certificates | 145,320,000 | 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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