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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
	Dec. 31, 2022	Dec. 31, 2021
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%
California
Concentration Risk [Line Items]
Concentration risk percentage	26.00%	29.00%
Texas
Concentration Risk [Line Items]
Concentration risk percentage	12.00%	11.00%
Washington
Concentration Risk [Line Items]
Concentration risk percentage	11.00%	8.00%
Colorado
Concentration Risk [Line Items]
Concentration risk percentage	9.00%	7.00%
Florida
Concentration Risk [Line Items]
Concentration risk percentage	9.00%	6.00%
New York
Concentration Risk [Line Items]
Concentration risk percentage	3.00%	2.00%
Arizona
Concentration Risk [Line Items]
Concentration risk percentage		5.00%
New Jersey
Concentration Risk [Line Items]
Concentration risk percentage	1.00%	1.00%
Illinois
Concentration Risk [Line Items]
Concentration risk percentage	1.00%	2.00%
Maryland
Concentration Risk [Line Items]
Concentration risk percentage	1.00%	1.00%
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	27.00%	28.00%
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 | Texas
Concentration Risk [Line Items]
Concentration risk percentage	6.00%	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%	2.00%
Legacy Sequoia | Florida
Concentration Risk [Line Items]
Concentration risk percentage	13.00%	14.00%
Legacy Sequoia | New York
Concentration Risk [Line Items]
Concentration risk percentage	11.00%	11.00%
Legacy Sequoia | Arizona
Concentration Risk [Line Items]
Concentration risk percentage		1.00%
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	34.00%	33.00%
Sequoia
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%
Sequoia | California
Concentration Risk [Line Items]
Concentration risk percentage	35.00%	35.00%
Sequoia | Texas
Concentration Risk [Line Items]
Concentration risk percentage	12.00%	12.00%
Sequoia | Washington
Concentration Risk [Line Items]
Concentration risk percentage	5.00%	5.00%
Sequoia | Colorado
Concentration Risk [Line Items]
Concentration risk percentage	6.00%	6.00%
Sequoia | Florida
Concentration Risk [Line Items]
Concentration risk percentage	4.00%	4.00%
Sequoia | New York
Concentration Risk [Line Items]
Concentration risk percentage	2.00%	2.00%
Sequoia | Arizona
Concentration Risk [Line Items]
Concentration risk percentage		3.00%
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%	4.00%
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	30.00%	26.00%
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 | Texas
Concentration Risk [Line Items]
Concentration risk percentage	3.00%	3.00%
Freddie Mac SLST | Washington
Concentration Risk [Line Items]
Concentration risk percentage	2.00%	2.00%
Freddie Mac SLST | Colorado
Concentration Risk [Line Items]
Concentration risk percentage	1.00%	1.00%
Freddie Mac SLST | Florida
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	10.00%
Freddie Mac SLST | New York
Concentration Risk [Line Items]
Concentration risk percentage	11.00%	10.00%
Freddie Mac SLST | Arizona
Concentration Risk [Line Items]
Concentration risk percentage		2.00%
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 | 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%	39.00%

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