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Residential Loans, at Fair Value - Concentration of Risk (Details) - Geographic Concentration Risk	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Residential loans | California
Concentration Risk [Line Items]
Geographic concentration, percent	20.50%	22.40%
Residential loans | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	13.90%	15.50%
Residential loans | New York
Concentration Risk [Line Items]
Geographic concentration, percent	9.60%	7.00%
Residential loans | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	5.80%	8.10%
Residential loans | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	5.20%	4.90%
Residential loans | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	3.10%	3.00%
Consolidated SLST | VIE, Primary Beneficiary | California
Concentration Risk [Line Items]
Geographic concentration, percent	10.70%	10.70%
Consolidated SLST | VIE, Primary Beneficiary | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	10.10%	10.30%
Consolidated SLST | VIE, Primary Beneficiary | New York
Concentration Risk [Line Items]
Geographic concentration, percent	10.00%	10.00%
Consolidated SLST | VIE, Primary Beneficiary | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	3.80%	3.90%
Consolidated SLST | VIE, Primary Beneficiary | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	7.60%	7.60%
Consolidated SLST | VIE, Primary Beneficiary | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	7.20%	7.20%
Residential loans held in securitization trusts | California
Concentration Risk [Line Items]
Geographic concentration, percent	19.20%	18.40%
Residential loans held in securitization trusts | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	12.80%	11.00%
Residential loans held in securitization trusts | New York
Concentration Risk [Line Items]
Geographic concentration, percent	7.30%	8.50%
Residential loans held in securitization trusts | Texas
Concentration Risk [Line Items]
Geographic concentration, percent	8.70%	7.10%
Residential loans held in securitization trusts | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	5.70%	6.00%
Residential loans held in securitization trusts | Illinois
Concentration Risk [Line Items]
Geographic concentration, percent	3.40%	3.50%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
-SubTopic 310
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481027/954-310-50-2

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-42

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