Residential Investor Loans - Schedule of Geographic Concentration of Residential Investor Loans (Details) - Geographic Concentration Risk - Loan Benchmark	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Bridge at Redwood
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	100.00%	100.00%
Bridge at Redwood | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	3.00%	13.00%
Bridge at Redwood | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	7.00%	6.00%
Bridge at Redwood | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	5.00%	5.00%
Bridge at Redwood | Tennessee
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	3.00%	3.00%
Bridge at Redwood | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	20.00%	13.00%
Bridge at Redwood | Alabama
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	7.00%	6.00%
Bridge at Redwood | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	9.00%	10.00%
Bridge at Redwood | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	2.00%	2.00%
Bridge at Redwood | Ohio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	0.00%
Bridge at Redwood | Connecticut
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	0.00%	2.00%
Bridge at Redwood | Georgia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	19.00%	18.00%
Bridge at Redwood | Other states (none greater than 5%)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	25.00%	22.00%
Single-family rental loans, held-for-sale at fair value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	100.00%	100.00%
Single-family rental loans, held-for-sale at fair value | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	26.00%	22.00%
Single-family rental loans, held-for-sale at fair value | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	4.00%	4.00%
Single-family rental loans, held-for-sale at fair value | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	12.00%	8.00%
Single-family rental loans, held-for-sale at fair value | Tennessee
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	3.00%	7.00%
Single-family rental loans, held-for-sale at fair value | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	6.00%	6.00%
Single-family rental loans, held-for-sale at fair value | Alabama
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	1.00%	3.00%
Single-family rental loans, held-for-sale at fair value | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	7.00%	7.00%
Single-family rental loans, held-for-sale at fair value | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	2.00%	3.00%
Single-family rental loans, held-for-sale at fair value | Ohio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	6.00%
Single-family rental loans, held-for-sale at fair value | Connecticut
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	0.00%	2.00%
Single-family rental loans, held-for-sale at fair value | Georgia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	7.00%	13.00%
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 (as a percent)	26.00%	25.00%
Term at Redwood | Single Family Rental Loans Held for Investment at Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	100.00%	100.00%
Term at Redwood | Single Family Rental Loans Held for Investment at Fair Value | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	18.00%	8.00%
Term at Redwood | Single Family Rental Loans Held for Investment at Fair Value | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	10.00%	4.00%
Term at Redwood | Single Family Rental Loans Held for Investment at Fair Value | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	6.00%	8.00%
Term at Redwood | Single Family Rental Loans Held for Investment at Fair Value | Tennessee
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	4.00%	2.00%
Term at Redwood | Single Family Rental Loans Held for Investment at Fair Value | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	2.00%	0.00%
Term at Redwood | Single Family Rental Loans Held for Investment at Fair Value | Alabama
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	2.00%	1.00%
Term at Redwood | Single Family Rental Loans Held for Investment at Fair Value | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	1.00%	10.00%
Term at Redwood | Single Family Rental Loans Held for Investment at Fair Value | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	1.00%	0.00%
Term at Redwood | Single Family Rental Loans Held for Investment at Fair Value | Ohio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	1.00%
Term at Redwood | Single Family Rental Loans Held for Investment at Fair Value | Connecticut
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	0.00%	0.00%
Term at Redwood | Single Family Rental Loans Held for Investment at Fair Value | Georgia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	0.00%	5.00%
Term 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 (as a percent)	55.00%	62.00%
Term at CAFL | Single Family Rental Loans Held for Investment at Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	100.00%	100.00%
Term at CAFL | Single Family Rental Loans Held for Investment at Fair Value | Texas
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	17.00%	16.00%
Term at CAFL | Single Family Rental Loans Held for Investment at Fair Value | New Jersey
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	6.00%	7.00%
Term at CAFL | Single Family Rental Loans Held for Investment at Fair Value | California
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	4.00%	4.00%
Term at CAFL | Single Family Rental Loans Held for Investment at Fair Value | Tennessee
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	2.00%	2.00%
Term at CAFL | Single Family Rental Loans Held for Investment at Fair Value | Illinois
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	6.00%	5.00%
Term at CAFL | Single Family Rental Loans Held for Investment at Fair Value | Alabama
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	2.00%	3.00%
Term at CAFL | Single Family Rental Loans Held for Investment at Fair Value | Florida
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	7.00%	7.00%
Term at CAFL | Single Family Rental Loans Held for Investment at Fair Value | New York
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	7.00%	7.00%
Term at CAFL | Single Family Rental Loans Held for Investment at Fair Value | Ohio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	7.00%
Term at CAFL | Single Family Rental Loans Held for Investment at Fair Value | Connecticut
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	7.00%	8.00%
Term at CAFL | Single Family Rental Loans Held for Investment at Fair Value | Georgia
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	6.00%	5.00%
Term at CAFL | 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 (as a percent)	29.00%	36.00%