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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	6 Months Ended
	Jun. 30, 2024 USD ($)
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	12,508
Other settlements, net	0
Ending balance - June 30, 2024	72,260
ABS Issued
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2023	9,151,263
Acquisitions	2,600,015
Sales	(1,341)
Principal paydowns	(648,108)
Gains (losses) in net income, net	(126,141)
Other settlements, net	0
Ending balance - June 30, 2024	10,975,688
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	2,907,602
Originations	0
Sales	(205,016)
Principal paydowns	(441,219)
Gains (losses) in net income, net	(100,547)
Unrealized gains in OCI, net	0
Other settlements, net	(1,301)
Ending balance - June 30, 2024	9,210,156
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	16,325
Originations	755,826
Sales	(467,797)
Principal paydowns	(634,224)
Gains (losses) in net income, net	2,305
Unrealized gains in OCI, net	0
Other settlements, net	(13,082)
Ending balance - June 30, 2024	4,879,650
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	(1,022)
Gains (losses) in net income, net	(2,469)
Unrealized gains in OCI, net	0
Other settlements, net	0
Ending balance - June 30, 2024	421,794
Trading Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2023	40,424
Acquisitions	63,618
Originations
Sales	0
Principal paydowns	(476)
Gains (losses) in net income, net	16,058
Unrealized gains in OCI, net	0
Other settlements, net	0
Ending balance - June 30, 2024	119,624
AFS Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2023	87,373
Acquisitions	47,442
Originations
Sales	0
Principal paydowns	(175)
Gains (losses) in net income, net	429
Unrealized gains in OCI, net	9,708
Other settlements, net	0
Ending balance - June 30, 2024	144,777
HEI
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2023	550,436
Acquisitions	606
Originations	0
Sales	0
Principal paydowns	(27,182)
Gains (losses) in net income, net	50,259
Unrealized gains in OCI, net	0
Other settlements, net	0
Ending balance - June 30, 2024	574,119
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	(8,959)
Gains (losses) in net income, net	10,977
Unrealized gains in OCI, net	0
Other settlements, net	0
Ending balance - June 30, 2024	227,363
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	(2,613)
Unrealized gains in OCI, net	0
Other settlements, net	0
Ending balance - June 30, 2024	34,754
MSRs and Other Investments
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	(128)
Gains (losses) in net income, net	3,691
Unrealized gains in OCI, net	0
Other settlements, net	(100)
Ending balance - June 30, 2024	31,718
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	1,137
Other settlements, net	(5,571)
Ending balance - June 30, 2024	$ 3,670

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