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Fair Value of Financial Instruments - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2024 USD ($)
ABS Issued
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2023	$ 9,151,263
Acquisitions	4,280,237
Sales	(1,544)
Principal paydowns	(1,122,041)
Gains (losses) in net income, net	256,114
Other settlements, net	0
Ending balance - September 30, 2024	12,564,029
Change in unrealized gains or (losses) for the period included in earnings for liabilities held at the end of the reporting period	195,951
HEI Securitization Non-controlling interest
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2023	59,752
Acquisitions	0
Sales	0
Principal paydowns	0
Gains (losses) in net income, net	21,111
Other settlements, net	0
Ending balance - September 30, 2024	80,863
Change in unrealized gains or (losses) for the period included in earnings for liabilities held at the end of the reporting period	(21,111)
Residential Consumer Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2023	7,050,637
Acquisitions	4,931,228
Originations	0
Sales	(245,771)
Principal paydowns	(790,158)
Gains (losses) in net income, net	213,491
Unrealized gains in OCI, net	0
Other settlements, net	(2,268)
Ending balance - September 30, 2024	11,157,159
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period	145,485
Residential Investor Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2023	5,220,297
Acquisitions	19,155
Originations	1,201,564
Sales	(744,759)
Principal paydowns	(1,016,256)
Gains (losses) in net income, net	79,288
Unrealized gains in OCI, net	0
Other settlements, net	(13,115)
Ending balance - September 30, 2024	4,746,174
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period	50,712
Consolidated Agency Multifamily Loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2023	425,285
Acquisitions	0
Originations	0
Sales	0
Principal paydowns	(6,418)
Gains (losses) in net income, net	6,781
Unrealized gains in OCI, net	0
Other settlements, net	0
Ending balance - September 30, 2024	425,648
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period	6,582
Real Estate Trading Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2023	40,424
Acquisitions	96,810
Originations	0
Sales	(2,833)
Principal paydowns	(556)
Gains (losses) in net income, net	(5,065)
Unrealized gains in OCI, net	0
Other settlements, net	0
Ending balance - September 30, 2024	128,780
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period	(5,320)
Real Estate AFS Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2023	87,373
Acquisitions	103,934
Originations	0
Sales	0
Principal paydowns	(4,757)
Gains (losses) in net income, net	1,731
Unrealized gains in OCI, net	17,080
Other settlements, net	0
Ending balance - September 30, 2024	205,361
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period	17,083
HEI
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2023	550,436
Acquisitions	1,066
Originations	0
Sales	0
Principal paydowns	(36,899)
Gains (losses) in net income, net	75,477
Unrealized gains in OCI, net	0
Other settlements, net	0
Ending balance - September 30, 2024	590,080
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period	68,078
Servicer Advance Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2023	225,345
Acquisitions	0
Originations	0
Sales	0
Principal paydowns	(21,151)
Gains (losses) in net income, net	8,252
Unrealized gains in OCI, net	0
Other settlements, net	0
Ending balance - September 30, 2024	212,446
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period	8,252
Excess MSRs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2023	37,367
Acquisitions	0
Originations	0
Sales	0
Principal paydowns	0
Gains (losses) in net income, net	(3,876)
Unrealized gains in OCI, net	0
Other settlements, net	0
Ending balance - September 30, 2024	33,491
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period	(3,877)
MSRs/Strategic Investments/Other
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2023	28,070
Acquisitions	185
Originations	0
Sales	0
Principal paydowns	(141)
Gains (losses) in net income, net	1,632
Unrealized gains in OCI, net	0
Other settlements, net	(100)
Ending balance - September 30, 2024	29,646
Change in unrealized gains or (losses) for the period included in earnings for assets held at the end of the reporting period	2,555
Derivatives
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2023	8,104
Acquisitions	0
Sales	0
Principal paydowns	0
Gains (losses) in net income, net	10,938
Other settlements, net	(19,911)
Ending balance - September 30, 2024	(869)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Change in unrealized gains or (losses) for the period included in earnings for liabilities held at the end of the reporting period	$ (869)

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