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	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2025
Total ABS Issued
Liabilities
Beginning balance		$ 12,879,530
Acquisitions		3,908,558
Sales		0
Principal paydowns		(1,293,470)
Gains (losses) in net income (loss), net		219,774
Other settlements, net		0
Ending balance	$ 15,714,392	15,714,392
Change in unrealized gains or (losses) for the period included in earnings for liabilities held at the end of the reporting period		150,222
Non-controlling interest
Liabilities
Beginning balance		99,510
Acquisitions		0
Sales		0
Principal paydowns		9,707
Gains (losses) in net income (loss), net		16,926
Other settlements, net		1,469
Ending balance	127,612	127,612
Change in unrealized gains or (losses) for the period included in earnings for liabilities held at the end of the reporting period		(6,773)
Residential Consumer Loans
Assets
Beginning balance		11,077,823
Acquisitions		5,242,364
Originations		0
Sales		(1,212,672)
Principal paydowns		(1,095,924)
Consolidation of securitized bridge loans		0
Gains (losses) in net income, net		194,373
Unrealized gains in OCI, net		0
Other settlements, net		(4,071)
Ending balance	14,201,893	14,201,893
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period		186,838
Residential Investor Loans
Assets
Beginning balance		4,587,090
Acquisitions		43,037
Originations		932,588
Sales		(826,649)
Principal paydowns		(662,975)
Consolidation of securitized bridge loans		306,422
Gains (losses) in net income, net		(54,972)
Unrealized gains in OCI, net		0
Other settlements, net		(10,606)
Ending balance	4,313,935	4,313,935
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period		(59,577)
Liabilities
Joint venture transferred	222,000	222,000
Consolidated Agency multifamily loans
Assets
Beginning balance		424,597
Acquisitions		0
Originations		0
Sales		0
Principal paydowns		(4,512)
Consolidation of securitized bridge loans		0
Gains (losses) in net income, net		3,012
Unrealized gains in OCI, net		0
Other settlements, net		0
Ending balance	423,097	423,097
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period		2,953
HEI
Assets
Beginning balance		589,785
Acquisitions		0
Originations	4,000	6,060
Sales		0
Principal paydowns		(21,711)
Consolidation of securitized bridge loans		0
Gains (losses) in net income, net		13,363
Unrealized gains in OCI, net		0
Other settlements, net		139
Ending balance	587,636	587,636
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period		14,713
Real Estate Trading Securities
Assets
Beginning balance		193,749
Acquisitions		21,243
Originations		0
Sales		(12,903)
Principal paydowns		(318)
Consolidation of securitized bridge loans		0
Gains (losses) in net income, net		(51,273)
Unrealized gains in OCI, net		0
Other settlements, net		0
Ending balance	150,498	150,498
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period		(48,732)
Real Estate AFS Securities
Assets
Beginning balance		211,474
Acquisitions		844
Originations		0
Sales		(102,378)
Principal paydowns		(218)
Consolidation of securitized bridge loans		0
Gains (losses) in net income, net		1,510
Unrealized gains in OCI, net		3,267
Other settlements, net		0
Ending balance	114,499	114,499
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period		3,960
Servicing Investments
Assets
Beginning balance		297,683
Acquisitions		0
Originations		0
Sales		0
Principal paydowns		5,583
Consolidation of securitized bridge loans		0
Gains (losses) in net income, net		(5,262)
Unrealized gains in OCI, net		0
Other settlements, net		0
Ending balance	298,004	298,004
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period		(4,575)
Strategic Investments
Assets
Beginning balance		3,460
Acquisitions		0
Originations		0
Sales		0
Principal paydowns		0
Consolidation of securitized bridge loans		0
Gains (losses) in net income, net		0
Unrealized gains in OCI, net		0
Other settlements, net		0
Ending balance	3,460	3,460
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period		0
Derivatives
Assets
Beginning balance		5,323
Acquisitions		0
Originations		0
Sales		0
Principal paydowns		0
Consolidation of securitized bridge loans		0
Gains (losses) in net income, net		39,888
Unrealized gains in OCI, net		0
Other settlements, net		(31,903)
Ending balance	$ 13,308	13,308
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period		$ 13,308