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Residential Loans - Geographic Concentration of Residential Loans Recorded on Consolidated Balance Sheet (Details) - Residential loans, held-for-investment - Geographic Concentration Risk - Loan Benchmark | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
California |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 29.00% | 43.00%
Texas |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 11.00% | 10.00%
Washington |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 8.00% | 7.00%
Colorado |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 7.00% | 5.00%
Florida |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 6.00% | 3.00%
Arizona |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00% |
New York |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 1.00%
New Jersey |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 1.00% | 1.00%
Illinois |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 3.00%
MARYLAND |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 1.00% | 2.00%
Ohio |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 0.00% | 0.00%
Other states (none greater than 5%) |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 28.00% | 25.00%
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% | 17.00%
Legacy Sequoia | Texas |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00% | 5.00%
Legacy Sequoia | Washington |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 1.00% | 1.00%
Legacy Sequoia | Colorado |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 3.00%
Legacy Sequoia | Florida |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 14.00% | 14.00%
Legacy Sequoia | Arizona |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 1.00% |
Legacy Sequoia | New York |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 11.00% | 10.00%
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 | MARYLAND |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 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 | 33.00% | 35.00%
Sequoia |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
Sequoia | California |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 35.00% | 34.00%
Sequoia | Texas |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 12.00% | 10.00%
Sequoia | Washington |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00% | 5.00%
Sequoia | Colorado |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 6.00% | 3.00%
Sequoia | Florida |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 4.00% | 6.00%
Sequoia | Arizona |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 3.00% |
Sequoia | New York |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 5.00%
Sequoia | New Jersey |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 1.00% | 2.00%
Sequoia | Illinois |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 4.00% | 2.00%
Sequoia | MARYLAND |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 1.00%
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 | 26.00% | 32.00%
Freddie Mac SLST(1) |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
Freddie Mac SLST(1) | California |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 14.00% | 14.00%
Freddie Mac SLST(1) | Texas |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 3.00% | 3.00%
Freddie Mac SLST(1) | Washington |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 2.00%
Freddie Mac SLST(1) | Colorado |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 1.00% | 1.00%
Freddie Mac SLST(1) | Florida |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 10.00% | 10.00%
Freddie Mac SLST(1) | Arizona |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% |
Freddie Mac SLST(1) | New York |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 10.00% | 10.00%
Freddie Mac SLST(1) | New Jersey |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 7.00% | 7.00%
Freddie Mac SLST(1) | Illinois |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00% | 5.00%
Freddie Mac SLST(1) | MARYLAND |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00% | 5.00%
Freddie Mac SLST(1) | Ohio |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 2.00%
Freddie Mac SLST(1) | Other states (none greater than 5%) |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 39.00% | 41.00%

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