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Fair Value of Financial Instruments - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
HEIs
Liabilities
Beginning balance	$ 0
Acquisitions	16,639
Principal paydowns	0
Gains (losses) in net income (loss), net	396
Other settlements, net	0
Ending Balance	17,035	$ 0
ABS issued
Liabilities
Beginning balance	6,900,362	10,515,475
Acquisitions	4,202,070	1,478,589
Principal paydowns	(1,922,313)	(1,487,958)
Deconsolidations		(3,706,789)
Gains (losses) in net income (loss), net	(336,972)	101,045
Other settlements, net	0	0
Ending Balance	8,843,147	6,900,362
Contingent Consideration
Liabilities
Beginning balance	0	28,484
Acquisitions		0
Principal paydowns		(13,353)
Deconsolidations		0
Gains (losses) in net income (loss), net		(446)
Other settlements, net		(14,685)
Ending Balance		0
Residential Loans
Assets
Beginning balance	4,249,014	7,714,745
Acquisitions	13,139,907	4,483,473
Originations	0	0
Sales	(8,449,328)	(6,262,958)
Principal paydowns	(1,360,649)	(1,552,171)
Deconsolidations		0
Gains (losses) in net income (loss), net	16,688	(132,307)
Unrealized losses in OCI, net	0	0
Other settlements, net	(3,234)	(1,768)
Ending Balance	7,592,398	4,249,014
Business Purpose Loans
Assets
Beginning balance	4,136,353	3,506,743
Acquisitions	136,685	0
Originations	2,150,539	1,431,251
Sales	(211,113)	(135,800)
Principal paydowns	(1,307,566)	(753,026)
Deconsolidations		0
Gains (losses) in net income (loss), net	(77,357)	99,590
Unrealized losses in OCI, net	0	0
Other settlements, net	(36,552)	(12,405)
Ending Balance	4,790,989	4,136,353
Multifamily securities
Assets
Beginning balance	492,221	4,408,524
Acquisitions	0	0
Originations	0	0
Sales	0	0
Principal paydowns	(7,639)	(7,703)
Deconsolidations		(3,849,779)
Gains (losses) in net income (loss), net	(11,068)	(58,821)
Unrealized losses in OCI, net	0	0
Other settlements, net	0	0
Ending Balance	473,514	492,221
Trading securities
Assets
Beginning balance	125,667	860,540
Acquisitions	58,917	108,249
Originations	0	0
Sales	(34,802)	(603,529)
Principal paydowns	(2,713)	(8,687)
Deconsolidations		0
Gains (losses) in net income (loss), net	23,550	(230,906)
Unrealized losses in OCI, net	0	0
Other settlements, net	0	0
Ending Balance	170,619	125,667
AFS Securities
Assets
Beginning balance	218,458	239,334
Acquisitions	19,100	57,652
Originations	0	0
Sales	(4,785)	(55,192)
Principal paydowns	(57,953)	(17,924)
Deconsolidations		0
Gains (losses) in net income (loss), net	40,735	10,792
Unrealized losses in OCI, net	(8,763)	(16,204)
Other settlements, net	0	0
Ending Balance	206,792	218,458
Servicer advance investments
Assets
Beginning balance	231,489	169,204
Acquisitions	196,583	179,419
Originations	0	0
Sales	0	0
Principal paydowns	(76,223)	(107,527)
Deconsolidations		0
Gains (losses) in net income (loss), net	(926)	(9,607)
Unrealized losses in OCI, net	0	0
Other settlements, net	0	0
Ending Balance	350,923	231,489
Excess MSRs
Assets
Beginning balance	34,418	31,814
Acquisitions	17,830	10,906
Originations	0	0
Sales	0	0
Principal paydowns	0	0
Deconsolidations		0
Gains (losses) in net income (loss), net	(8,017)	(8,302)
Unrealized losses in OCI, net	0	0
Other settlements, net	0	0
Ending Balance	44,231	34,418
HEIs
Assets
Beginning balance	42,440	45,085
Acquisitions	155,023	3,517
Originations	0	0
Sales	0	0
Principal paydowns	(19,395)	(4,278)
Deconsolidations		0
Gains (losses) in net income (loss), net	13,774	(1,884)
Unrealized losses in OCI, net	0	0
Other settlements, net	898	0
Ending Balance	192,740	42,440
MSRs and Other Investments
Assets
Beginning balance	27,662	67,313
Acquisitions	15,215	450
Originations	0	0
Sales	0	0
Principal paydowns	(14,751)	(5,843)
Deconsolidations		0
Gains (losses) in net income (loss), net	(2,846)	(34,258)
Unrealized losses in OCI, net	0	0
Other settlements, net	(179)	0
Ending Balance	25,101	27,662
Derivatives
Assets
Beginning balance	14,450	8,860
Acquisitions	0	0
Principal paydowns	0	0
Deconsolidations		0
Gains (losses) in net income (loss), net	10,437	56,972
Other settlements, net	(20,757)	(51,382)
Ending Balance	$ 4,130	$ 14,450

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