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Business Purpose Loans - Schedule of Geographic Concentration of Business Purpose Loans (Details) - Geographic Concentration Risk - Loan Benchmark	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
BPL bridge loans held-for-investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	100.00%	100.00%
BPL bridge loans held-for-investment | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	10.00%	6.00%
BPL bridge loans held-for-investment | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	5.00%	2.00%
BPL bridge loans held-for-investment | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	13.00%	13.00%
BPL bridge loans held-for-investment | Georgia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	18.00%	21.00%
BPL bridge loans held-for-investment | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	6.00%	7.00%
BPL bridge loans held-for-investment | Tennessee
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	3.00%	6.00%
BPL bridge loans held-for-investment | Alabama
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	6.00%	6.00%
BPL bridge loans held-for-investment | Connecticut
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	2.00%	4.00%
BPL bridge loans held-for-investment | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	2.00%	2.00%
BPL bridge loans held-for-investment | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	13.00%	8.00%
BPL bridge loans held-for-investment | Other states (none greater than 5%)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	22.00%	25.00%
Single-family rental loans, held-for-sale at fair value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	100.00%	100.00%
Single-family rental loans, held-for-sale at fair value | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	7.00%	5.00%
Single-family rental loans, held-for-sale at fair value | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	8.00%	3.00%
Single-family rental loans, held-for-sale at fair value | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	22.00%	1.00%
Single-family rental loans, held-for-sale at fair value | Georgia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	13.00%	14.00%
Single-family rental loans, held-for-sale at fair value | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	4.00%	6.00%
Single-family rental loans, held-for-sale at fair value | Tennessee
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	7.00%	2.00%
Single-family rental loans, held-for-sale at fair value | Alabama
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	3.00%	33.00%
Single-family rental loans, held-for-sale at fair value | Connecticut
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	2.00%	1.00%
Single-family rental loans, held-for-sale at fair value | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	3.00%	3.00%
Single-family rental loans, held-for-sale at fair value | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	6.00%	3.00%
Single-family rental loans, held-for-sale at fair value | Other states (none greater than 5%)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	25.00%	29.00%
HEI at Redwood | Single family rental loans held for investment at fair value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	100.00%	100.00%
HEI at Redwood | Single family rental loans held for investment at fair value | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	10.00%	4.00%
HEI at Redwood | Single family rental loans held for investment at fair value | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	8.00%	34.00%
HEI at Redwood | Single family rental loans held for investment at fair value | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	8.00%	3.00%
HEI at Redwood | Single family rental loans held for investment at fair value | Georgia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	5.00%	2.00%
HEI at Redwood | Single family rental loans held for investment at fair value | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	4.00%	2.00%
HEI at Redwood | Single family rental loans held for investment at fair value | Tennessee
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	2.00%	1.00%
HEI at Redwood | Single family rental loans held for investment at fair value | Alabama
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	1.00%	2.00%
HEI at Redwood | Single family rental loans held for investment at fair value | Connecticut
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	0.00%	10.00%
HEI at Redwood | Single family rental loans held for investment at fair value | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	0.00%	5.00%
HEI at Redwood | Single family rental loans held for investment at fair value | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	0.00%	6.00%
HEI at Redwood | Single family rental loans held for investment at fair value | Other states (none greater than 5%)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	62.00%	31.00%
Net investments in consolidated CAFL Term entities | Single family rental loans held for investment at fair value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	100.00%	100.00%
Net investments in consolidated CAFL Term entities | Single family rental loans held for investment at fair value | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	7.00%	7.00%
Net investments in consolidated CAFL Term entities | Single family rental loans held for investment at fair value | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	4.00%	4.00%
Net investments in consolidated CAFL Term entities | Single family rental loans held for investment at fair value | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	16.00%	16.00%
Net investments in consolidated CAFL Term entities | Single family rental loans held for investment at fair value | Georgia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	5.00%	5.00%
Net investments in consolidated CAFL Term entities | Single family rental loans held for investment at fair value | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	7.00%	8.00%
Net investments in consolidated CAFL Term entities | Single family rental loans held for investment at fair value | Tennessee
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	2.00%	2.00%
Net investments in consolidated CAFL Term entities | Single family rental loans held for investment at fair value | Alabama
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	3.00%	3.00%
Net investments in consolidated CAFL Term entities | Single family rental loans held for investment at fair value | Connecticut
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	8.00%	8.00%
Net investments in consolidated CAFL Term entities | Single family rental loans held for investment at fair value | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	7.00%	5.00%
Net investments in consolidated CAFL Term entities | Single family rental loans held for investment at fair value | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	5.00%	5.00%
Net investments in consolidated CAFL Term entities | Single family rental loans held for investment at fair value | Other states (none greater than 5%)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk percentage	36.00%	37.00%

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