Residential Investor Loans - Schedule of Geographic Concentration of Residential Investor Loans (Details) - Geographic Concentration Risk - Loan Benchmark	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	100.00%	100.00%
Indiana | Residential Investor Term, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	20.00%
Indiana | Residential Investor Term, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	4.00%
Indiana | Residential Investor Bridge, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	1.00%
Indiana | Residential Investor Bridge, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	0.00%
Ohio | Residential Investor Term, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	18.00%	1.00%
Ohio | Residential Investor Term, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	5.00%	7.00%
Ohio | Residential Investor Bridge, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	6.00%	0.00%
Ohio | Residential Investor Bridge, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	1.00%	6.00%
Georgia | Residential Investor Term, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	9.00%	0.00%
Georgia | Residential Investor Term, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	5.00%	6.00%
Georgia | Residential Investor Bridge, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	12.00%	19.00%
Georgia | Residential Investor Bridge, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	6.00%	7.00%
New York | Residential Investor Term, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	7.00%	1.00%
New York | Residential Investor Term, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	8.00%	7.00%
New York | Residential Investor Bridge, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	2.00%	2.00%
New York | Residential Investor Bridge, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	1.00%	2.00%
Illinois | Residential Investor Term, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	5.00%	2.00%
Illinois | Residential Investor Term, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	6.00%	6.00%
Illinois | Residential Investor Bridge, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	1.00%	20.00%
Illinois | Residential Investor Bridge, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	3.00%	6.00%
Alabama | Residential Investor Term, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)		2.00%
Alabama | Residential Investor Term, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)		2.00%
Alabama | Residential Investor Bridge, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)		7.00%
Alabama | Residential Investor Bridge, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)		1.00%
Texas | Residential Investor Term, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	3.00%	18.00%
Texas | Residential Investor Term, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	19.00%	17.00%
Texas | Residential Investor Bridge, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	3.00%	3.00%
Texas | Residential Investor Bridge, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	18.00%	26.00%
California | Residential Investor Term, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	3.00%	6.00%
California | Residential Investor Term, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	5.00%	4.00%
California | Residential Investor Bridge, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	5.00%	5.00%
California | Residential Investor Bridge, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	15.00%	12.00%
Tennessee | Residential Investor Term, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)		4.00%
Tennessee | Residential Investor Term, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)		2.00%
Tennessee | Residential Investor Bridge, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)		3.00%
Tennessee | Residential Investor Bridge, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)		3.00%
New Jersey | Residential Investor Term, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	3.00%	10.00%
New Jersey | Residential Investor Term, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	5.00%	6.00%
New Jersey | Residential Investor Bridge, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	7.00%	7.00%
New Jersey | Residential Investor Bridge, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	4.00%	4.00%
Florida | Residential Investor Term, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	2.00%	1.00%
Florida | Residential Investor Term, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	7.00%	7.00%
Florida | Residential Investor Bridge, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	8.00%	9.00%
Florida | Residential Investor Bridge, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	12.00%	7.00%
Oregon | Residential Investor Term, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	2.00%
Oregon | Residential Investor Term, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	0.00%
Oregon | Residential Investor Bridge, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	3.00%
Oregon | Residential Investor Bridge, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	6.00%
Louisiana | Residential Investor Term, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	1.00%
Louisiana | Residential Investor Term, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	2.00%
Louisiana | Residential Investor Bridge, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	33.00%
Louisiana | Residential Investor Bridge, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	0.00%
Arizona | Residential Investor Term, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	0.00%
Arizona | Residential Investor Term, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	2.00%
Arizona | Residential Investor Bridge, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	11.00%
Arizona | Residential Investor Bridge, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	4.00%
Washington | Residential Investor Term, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	0.00%
Washington | Residential Investor Term, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	1.00%
Washington | Residential Investor Bridge, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	2.00%
Washington | Residential Investor Bridge, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	5.00%
Connecticut | Residential Investor Term, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	0.00%	0.00%
Connecticut | Residential Investor Term, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	7.00%	7.00%
Connecticut | Residential Investor Bridge, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	0.00%	0.00%
Connecticut | Residential Investor Bridge, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	0.00%	0.00%
Other States | Residential Investor Term, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	27.00%	55.00%
Other States | Residential Investor Term, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	24.00%	29.00%
Other States | Residential Investor Bridge, Unsecuritized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	6.00%	25.00%
Other States | Residential Investor Bridge, Securitized
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk (as a percent)	25.00%	26.00%