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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	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
HEI Securitization Non-Controlling Interest
Liabilities
Beginning balance	$ 22,329	$ 17,035
Acquisitions	29,633	0
Principal paydowns	0	0
Gains (losses) in net income (loss), net	7,790	5,294
Other settlements, net	0	0
Ending Balance	59,752	22,329
ABS Issued
Liabilities
Beginning balance	7,424,132	8,843,147
Acquisitions	2,284,790	1,205,289
Principal paydowns	(784,501)	(1,394,000)
Gains (losses) in net income (loss), net	226,842	(1,230,304)
Other settlements, net	0	0
Ending Balance	9,151,263	7,424,132
Residential Loans
Assets
Beginning balance	5,613,188	7,592,432
Acquisitions	2,053,957	3,692,104
Originations	0	0
Sales	(261,980)	(3,830,318)
Principal paydowns	(494,104)	(866,477)
Gains (losses) in net income (loss), net	143,148	(970,241)
Unrealized gains (losses) in OCI, net	0	0
Other settlements, net	(3,572)	(4,312)
Ending Balance	7,050,637	5,613,188
Business Purpose Loans
Assets
Beginning balance	5,332,586	4,790,989
Acquisitions	0	181,814
Originations	1,581,545	2,715,817
Sales	(565,357)	(495,472)
Principal paydowns	(1,098,760)	(1,324,640)
Gains (losses) in net income (loss), net	62,715	(531,947)
Unrealized gains (losses) in OCI, net	0	0
Other settlements, net	(92,432)	(3,975)
Ending Balance	5,220,297	5,332,586
Multifamily securities
Assets
Beginning balance	424,552	473,514
Acquisitions	0	0
Originations	0	0
Sales	0	0
Principal paydowns	(8,326)	(7,975)
Gains (losses) in net income (loss), net	9,059	(40,987)
Unrealized gains (losses) in OCI, net	0	0
Other settlements, net	0	0
Ending Balance	425,285	424,552
Trading securities
Assets
Beginning balance	108,329	170,619
Acquisitions	7,883	5,006
Originations	0	0
Sales	(88,073)	(31,729)
Principal paydowns	(409)	(1,347)
Gains (losses) in net income (loss), net	12,694	(34,220)
Unrealized gains (losses) in OCI, net	0	0
Other settlements, net	0	0
Ending Balance	40,424	108,329
AFS Securities
Assets
Beginning balance	132,146	206,792
Acquisitions	1,979	10,000
Originations	0	0
Sales	(54,339)	0
Principal paydowns	(719)	(31,390)
Gains (losses) in net income (loss), net	1,170	13,660
Unrealized gains (losses) in OCI, net	7,136	(66,916)
Other settlements, net	0	0
Ending Balance	87,373	132,146
HEI
Assets
Beginning balance	403,462	192,740
Acquisitions	136,445	248,218
Originations	0	0
Sales	0	0
Principal paydowns	(43,398)	(42,744)
Gains (losses) in net income (loss), net	53,927	5,248
Unrealized gains (losses) in OCI, net	0	0
Other settlements, net	0	0
Ending Balance	550,436	403,462
Servicer advance investments
Assets
Beginning balance	269,259	350,923
Acquisitions	0	0
Originations	0	0
Sales	0	0
Principal paydowns	(55,777)	(70,589)
Gains (losses) in net income (loss), net	11,863	(11,075)
Unrealized gains (losses) in OCI, net	0	0
Other settlements, net	0	0
Ending Balance	225,345	269,259
Excess MSRs
Assets
Beginning balance	39,035	44,231
Acquisitions	0	0
Originations	0	0
Sales	0	0
Principal paydowns	0	0
Gains (losses) in net income (loss), net	(1,668)	(5,196)
Unrealized gains (losses) in OCI, net	0	0
Other settlements, net	0	0
Ending Balance	37,367	39,035
MSRs and Other Investments
Assets
Beginning balance	31,576	25,101
Acquisitions	500	8,638
Originations	0	0
Sales	1,522	(3,299)
Principal paydowns	(804)	(158)
Gains (losses) in net income (loss), net	(980)	9,873
Unrealized gains (losses) in OCI, net	0	0
Other settlements, net	(700)	(8,579)
Ending Balance	28,070	31,576
Derivatives
Assets
Beginning balance	322	4,130
Acquisitions	0	0
Principal paydowns	0	0
Gains (losses) in net income (loss), net	28,847	(55,209)
Other settlements, net	(21,065)	51,401
Ending Balance	$ 8,104	$ 322

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