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Residential Loans - Schedule of Geographic Concentration of Residential Loans (Details) - Residential loans, held-for-investment - Geographic Concentration Risk - Loan Benchmark | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
California |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 25.00% | 26.00%
Washington |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 16.00% | 11.00%
Texas |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 8.00% | 12.00%
Florida |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 7.00% | 9.00%
Colorado |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 4.00% | 9.00%
New Jersey |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 1.00%
Illinois |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 1.00%
New York |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 1.00% | 3.00%
Maryland |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 1.00% | 1.00%
Ohio |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 1.00% | 0.00%
Other states (none greater than 5%) |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 33.00% | 27.00%
Legacy Sequoia |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
Legacy Sequoia | California |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 18.00% | 18.00%
Legacy Sequoia | Washington |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 1.00%
Legacy Sequoia | Texas |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00% | 6.00%
Legacy Sequoia | Florida |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 12.00% | 13.00%
Legacy Sequoia | Colorado |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 3.00% | 2.00%
Legacy Sequoia | New Jersey |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00% | 5.00%
Legacy Sequoia | Illinois |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 3.00% | 3.00%
Legacy Sequoia | New York |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 12.00% | 11.00%
Legacy Sequoia | Maryland |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 1.00% | 2.00%
Legacy Sequoia | Ohio |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00% | 5.00%
Legacy Sequoia | Other states (none greater than 5%) |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 34.00% | 34.00%
Sequoia |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
Sequoia | California |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 33.00% | 35.00%
Sequoia | Washington |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 7.00% | 5.00%
Sequoia | Texas |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 11.00% | 12.00%
Sequoia | Florida |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00% | 4.00%
Sequoia | Colorado |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 7.00% | 6.00%
Sequoia | New Jersey |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 1.00% | 1.00%
Sequoia | Illinois |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 3.00% | 3.00%
Sequoia | New York |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 2.00%
Sequoia | Maryland |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 2.00%
Sequoia | Ohio |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 0.00% | 0.00%
Sequoia | Other states (none greater than 5%) |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 29.00% | 30.00%
Freddie Mac SLST |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
Freddie Mac SLST | California |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 14.00% | 14.00%
Freddie Mac SLST | Washington |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 2.00%
Freddie Mac SLST | Texas |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 3.00% | 3.00%
Freddie Mac SLST | Florida |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 10.00% | 10.00%
Freddie Mac SLST | Colorado |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 1.00% | 1.00%
Freddie Mac SLST | New Jersey |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 7.00% | 7.00%
Freddie Mac SLST | Illinois |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00% | 5.00%
Freddie Mac SLST | New York |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 11.00% | 11.00%
Freddie Mac SLST | Maryland |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00% | 5.00%
Freddie Mac SLST | Ohio |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 2.00%
Freddie Mac SLST | Other states (none greater than 5%) |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 40.00% | 40.00%

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