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Asset-Backed Securities Issued - Schedule of Asset-Backed Securities Issued (Details) | Dec. 31, 2023 USD ($) series trust | Dec. 31, 2022 USD ($) series trust
--- | --- | ---
Net investments in consolidated CAFL Term entities |  |
Debt Instrument [Line Items] |  |
Number of bridge securitization trusts | trust | 2 | 2
Asset-backed securities issued |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | $ 9,811,880,000 | $ 7,986,752,000
Asset-backed securities issued | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | (943,370,000) | (1,155,151,000)
Asset-backed securities issued | Deferred Debt Issuance Costs |  |
Debt Instrument [Line Items] |  |
Unamortized debt discount and deferred debt issuance costs | (5,929,000) | (8,134,000)
Asset-backed securities issued | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | 10,588,659,000 | 8,944,351,000
Asset-backed securities issued | Interest-only certificates at fair value |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | 172,520,000 | 205,686,000
Asset-backed securities issued | Legacy Sequoia |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | $ 138,530,000 | $ 184,191,000
Number of Series | series | 20 | 20
Asset-backed securities issued | Legacy Sequoia | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | $ (12,738,000) | $ (16,036,000)
Asset-backed securities issued | Legacy Sequoia | Deferred Debt Issuance Costs |  |
Debt Instrument [Line Items] |  |
Unamortized debt discount and deferred debt issuance costs | $ 0 | $ 0
Asset-backed securities issued | Legacy Sequoia | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series (as a percent) | 3.59% | 2.69%
Asset-backed securities issued | Legacy Sequoia | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series (as a percent) | 6.66% | 5.19%
Asset-backed securities issued | Legacy Sequoia | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | $ 151,106,000 | $ 200,047,000
Asset-backed securities issued | Legacy Sequoia | Interest-only certificates at fair value |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | 162,000 | 180,000
Asset-backed securities issued | Sequoia |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | $ 4,430,130,000 | $ 2,971,109,000
Number of Series | series | 22 | 17
Asset-backed securities issued | Sequoia | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | $ (622,522,000) | $ (682,477,000)
Asset-backed securities issued | Sequoia | Deferred Debt Issuance Costs |  |
Debt Instrument [Line Items] |  |
Unamortized debt discount and deferred debt issuance costs | $ 0 | $ 0
Asset-backed securities issued | Sequoia | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series (as a percent) | 2.67% | 2.57%
Asset-backed securities issued | Sequoia | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series (as a percent) | 6.24% | 6.13%
Asset-backed securities issued | Sequoia | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | $ 5,000,540,000 | $ 3,595,715,000
Asset-backed securities issued | Sequoia | Interest-only certificates at fair value |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | 52,112,000 | 57,871,000
Asset-backed securities issued | Net investments in consolidated CAFL Term entities |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | $ 3,362,978,000 | $ 3,115,807,000
Number of Series | series | 21 | 19
Asset-backed securities issued | Net investments in consolidated CAFL Term entities | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | $ (209,740,000) | $ (323,995,000)
Asset-backed securities issued | Net investments in consolidated CAFL Term entities | Deferred Debt Issuance Costs |  |
Debt Instrument [Line Items] |  |
Unamortized debt discount and deferred debt issuance costs | $ (1,935,000) | $ (7,376,000)
Asset-backed securities issued | Net investments in consolidated CAFL Term entities | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series (as a percent) | 2.34% | 2.34%
Asset-backed securities issued | Net investments in consolidated CAFL Term entities | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series (as a percent) | 7.89% | 5.92%
Asset-backed securities issued | Net investments in consolidated CAFL Term entities | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | $ 3,472,825,000 | $ 3,322,250,000
Asset-backed securities issued | Net investments in consolidated CAFL Term entities | Interest-only certificates at fair value |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | 101,828,000 | 124,928,000
Asset-backed securities issued | Freddie Mac SLST |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | $ 1,265,777,000 | $ 1,222,150,000
Number of Series | series | 3 | 3
Debt instrument, face amount | $ 182,000,000 | $ 86,000,000
Asset-backed securities issued | Freddie Mac SLST | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | (72,742,000) | (99,072,000)
Asset-backed securities issued | Freddie Mac SLST | Deferred Debt Issuance Costs |  |
Debt Instrument [Line Items] |  |
Unamortized debt discount and deferred debt issuance costs | $ (3,994,000) | $ (758,000)
Asset-backed securities issued | Freddie Mac SLST | 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 | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series (as a percent) | 7.50% | 4.75%
Asset-backed securities issued | Freddie Mac SLST | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | $ 1,328,657,000 | $ 1,306,652,000
Asset-backed securities issued | Freddie Mac SLST | Interest-only certificates at fair value |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | 13,856,000 | 15,328,000
Asset-backed securities issued | Freddie Mac K-Series |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | $ 391,977,000 | $ 392,785,000
Range of weighted average interest rates, by series (as a percent) | 3.55% | 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] |  |
ABS Issued, Net | $ (14,985,000) | $ (25,319,000)
Asset-backed securities issued | Freddie Mac K-Series | Deferred Debt Issuance Costs |  |
Debt Instrument [Line Items] |  |
Unamortized debt discount and deferred debt issuance costs | 0 | 0
Asset-backed securities issued | Freddie Mac K-Series | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | 402,400,000 | 410,725,000
Asset-backed securities issued | Freddie Mac K-Series | Interest-only certificates at fair value |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | 4,562,000 | 7,379,000
Asset-backed securities issued | HEI |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | $ 222,488,000 | $ 100,710,000
Range of weighted average interest rates, by series (as a percent) |  | 3.78%
Number of Series | series | 2 | 1
Asset-backed securities issued | HEI | Revision of Prior Period, Accounting Standards Update, Adjustment |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | $ (10,643,000) | $ (8,252,000)
Asset-backed securities issued | HEI | Deferred Debt Issuance Costs |  |
Debt Instrument [Line Items] |  |
Unamortized debt discount and deferred debt issuance costs | $ 0 | 0
Asset-backed securities issued | HEI | Minimum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series (as a percent) | 3.86% |
Asset-backed securities issued | HEI | Maximum |  |
Debt Instrument [Line Items] |  |
Range of weighted average interest rates, by series (as a percent) | 6.70% |
Asset-backed securities issued | HEI | Certificates with principal balance |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | $ 233,131,000 | 108,962,000
Asset-backed securities issued | HEI | Interest-only certificates at fair value |  |
Debt Instrument [Line Items] |  |
ABS Issued, Net | 0 | 0
Asset-backed securities issued | CoreVest |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount | $ 485,000,000 | $ 485,000,000

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