Fair Value of Financial Instruments - Schedule of Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Liabilities
Total Investment fair value changes, net	$ 23,199	$ 5,188
Total Residential Investor Loans
Liabilities
Total Investment fair value changes, net	218,000
Total ABS Issued
Liabilities
Beginning balance	17,433,600
Issuance	4,811,866
Sales	(1,943)
Principal paydowns	(1,659,632)
(Gains) losses in net income (loss), net	(166,079)
Other settlements, net	0
Ending balance	20,417,812
Change in unrealized (gains) or losses for the period included in earnings for liabilities held at the end of the reporting period	(217,033)
Non-controlling interest
Liabilities
Beginning balance	92,645
Issuance	0
Sales	0
Principal paydowns	0
(Gains) losses in net income (loss), net	3,894
Other settlements, net	(1,047)
Ending balance	95,492
Change in unrealized (gains) or losses for the period included in earnings for liabilities held at the end of the reporting period	3,894
Residential Consumer Loans
Assets
Beginning balance	17,935,761
Acquisitions (3)	6,724,282
Originations (3)	0
Sales	(2,037,561)
Transfer to fair value option	0
Principal paydowns	(1,243,489)
Consolidation of securitized bridge loans	0
Gains (losses) in net income, net	(78,098)
Unrealized gains in OCI, net	0
Other settlements, net	(1,011)
Ending balance	21,299,884
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period	(81,515)
Total Residential Investor Loans
Assets
Beginning balance	3,602,250
Acquisitions (3)	0
Originations (3)	432,422
Sales	(694,091)
Transfer to fair value option	0
Principal paydowns	(264,358)
Consolidation of securitized bridge loans	277,283
Gains (losses) in net income, net	(32,427)
Unrealized gains in OCI, net	0
Other settlements, net	(25,364)
Ending balance	3,295,715
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period	(35,868)
HEI
Assets
Beginning balance	329,883
Acquisitions (3)	0
Originations (3)	2,612
Sales	0
Transfer to fair value option	0
Principal paydowns	(3,926)
Consolidation of securitized bridge loans	0
Gains (losses) in net income, net	12,495
Unrealized gains in OCI, net	0
Other settlements, net	37
Ending balance	341,101
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period	12,724
Real Estate Trading Securities
Assets
Beginning balance	135,459
Acquisitions (3)	44,606
Originations (3)	0
Sales	(25,670)
Transfer to fair value option	0
Principal paydowns	(75)
Consolidation of securitized bridge loans	0
Gains (losses) in net income, net	27,817
Unrealized gains in OCI, net	0
Other settlements, net	0
Ending balance	182,137
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period	27,871
Real Estate AFS Securities
Assets
Beginning balance	287,557
Acquisitions (3)	10,185
Originations (3)	0
Sales	0
Transfer to fair value option	0
Principal paydowns	(408)
Consolidation of securitized bridge loans	0
Gains (losses) in net income, net	924
Unrealized gains in OCI, net	(4,008)
Other settlements, net	0
Ending balance	294,250
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period	(4,189)
Servicing Investments
Assets
Beginning balance	302,230
Acquisitions (3)	0
Originations (3)	0
Sales	0
Transfer to fair value option	0
Principal paydowns	(18,207)
Consolidation of securitized bridge loans	0
Gains (losses) in net income, net	13,980
Unrealized gains in OCI, net	0
Other settlements, net	1,693
Ending balance	299,696
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period	14,586
Strategic Investments
Assets
Beginning balance	6,310
Acquisitions (3)	527
Originations (3)	0
Sales	0
Transfer to fair value option	1,350
Principal paydowns	0
Consolidation of securitized bridge loans	0
Gains (losses) in net income, net	1,936
Unrealized gains in OCI, net	0
Other settlements, net	0
Ending balance	10,123
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period	(150)
Derivatives
Assets
Beginning balance	16,843
Acquisitions (3)	0
Originations (3)	0
Sales	0
Transfer to fair value option	0
Principal paydowns	0
Consolidation of securitized bridge loans	0
Gains (losses) in net income, net	1,997
Unrealized gains in OCI, net	0
Other settlements, net	(19,000)
Ending balance	(160)
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period	$ (196)