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Residential Consumer Loans - Characteristics of Residential Consumer Loans Held-for-Investment (Details) - Held-for-investment at fair value $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2024 USD ($) loan | Dec. 31, 2023 USD ($) loan
Legacy Sequoia |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 1,017 | 1,059
Unpaid principal balance | $ 146,688 | $ 156,053
Fair value of loans | $ 131,859 | $ 139,739
Weighted average coupon | 6.59% | 6.54%
Number of loans in foreclosure | loan | 5 | 7
Unpaid principal balance of loans in foreclosure | $ 1,086 | $ 1,848
Sequoia |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 7,078 | 6,070
Unpaid principal balance | $ 6,294,974 | $ 5,242,860
Fair value of loans | $ 5,640,341 | $ 4,640,464
Weighted average coupon | 4.52% | 4.08%
Number of loans in foreclosure | loan | 6 | 5
Unpaid principal balance of loans in foreclosure | $ 5,335 | $ 3,386
Freddie Mac SLST |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 10,187 | 10,302
Unpaid principal balance | $ 1,593,040 | $ 1,614,974
Fair value of loans | $ 1,332,686 | $ 1,359,242
Weighted average coupon | 4.50% | 4.50%
Number of loans in foreclosure | loan | 286 | 292
Unpaid principal balance of loans in foreclosure | $ 47,490 | $ 47,654
Financing Receivables, Equal to Greater than 90 Days Past Due | Legacy Sequoia |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans with 90+ day delinquencies | loan | 15 | 16
Fair value of loans with 90+ day delinquencies | $ 4,328 | $ 4,141
Financing Receivables, Equal to Greater than 90 Days Past Due | Sequoia |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans with 90+ day delinquencies | loan | 14 | 11
Fair value of loans with 90+ day delinquencies | $ 11,904 | $ 8,882
Financing Receivables, Equal to Greater than 90 Days Past Due | Freddie Mac SLST |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Number of loans with 90+ day delinquencies | loan | 743 | 796
Fair value of loans with 90+ day delinquencies | $ 125,401 | $ 132,307

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