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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, 2019	Dec. 31, 2018
Contingent Consideration
Liabilities
Beginning balance	$ 0
Acquisitions	25,267
Principal paydowns	0
Gains (losses) in net income, net	3,217
Other settlements, net	0
Ending Balance	28,484	$ 0
ABS issued
Liabilities
Beginning balance	5,410,073	1,164,585
Acquisitions	6,098,462	4,613,168
Principal paydowns	(1,112,437)	(459,173)
Gains (losses) in net income, net	119,377	91,493
Other settlements, net	0	0
Ending Balance	10,515,475	5,410,073
Residential Loans
Assets
Beginning balance	7,254,631	5,114,317
Acquisitions	7,092,866	8,338,724
Originations	0
Sales	(5,141,886)	(5,425,168)
Principal paydowns	(1,609,220)	(814,122)
Gains (losses) in net income, net	119,132	44,627
Unrealized losses in OCI, net	0	0
Other settlements, net	(778)	(3,747)
Ending Balance	7,714,745	7,254,631
Business purpose residential loans
Assets
Beginning balance	141,258	0
Acquisitions	2,639,615	167,777
Originations	1,015,436
Sales	(76,909)	0
Principal paydowns	(213,655)	(27,382)
Gains (losses) in net income, net	7,423	863
Unrealized losses in OCI, net	0	0
Other settlements, net	(6,425)	0
Ending Balance	3,506,743	141,258
Multifamily loans
Assets
Beginning balance	2,144,598	0
Acquisitions	2,162,386	2,099,916
Originations	0
Sales	0	0
Principal paydowns	(28,543)	(1,873)
Gains (losses) in net income, net	130,083	46,555
Unrealized losses in OCI, net	0	0
Other settlements, net	0	0
Ending Balance	4,408,524	2,144,598
Trading securities
Assets
Beginning balance	1,118,612	968,844
Acquisitions	332,593	653,739
Originations	0
Sales	(597,122)	(438,304)
Principal paydowns	(44,600)	(40,050)
Gains (losses) in net income, net	56,008	(8,436)
Unrealized losses in OCI, net	0	0
Other settlements, net	(4,951)	(17,181)
Ending Balance	860,540	1,118,612
AFS Securities
Assets
Beginning balance	333,882	507,666
Acquisitions	26,539	7,739
Originations	0
Sales	(110,069)	(143,644)
Principal paydowns	(39,704)	(44,446)
Gains (losses) in net income, net	24,580	41,051
Unrealized losses in OCI, net	4,106	(34,484)
Other settlements, net	0	0
Ending Balance	239,334	333,882
Servicer advance investments
Assets
Beginning balance	300,468	0
Acquisitions	69,610	395,813
Originations	0
Sales	0	0
Principal paydowns	(203,876)	(94,644)
Gains (losses) in net income, net	3,002	(701)
Unrealized losses in OCI, net	0	0
Other settlements, net	0	0
Ending Balance	169,204	300,468
MSRs
Assets
Beginning balance	60,281	63,598
Acquisitions	868	328
Originations	0
Sales	0	(1,077)
Principal paydowns	0	0
Gains (losses) in net income, net	(18,925)	(2,568)
Unrealized losses in OCI, net	0	0
Other settlements, net	0	0
Ending Balance	42,224	60,281
Excess MSRs
Assets
Beginning balance	27,312	0
Acquisitions	7,762	25,489
Originations	0
Sales	0	0
Principal paydowns	0	0
Gains (losses) in net income, net	(3,260)	1,823
Unrealized losses in OCI, net	0	0
Other settlements, net	0	0
Ending Balance	31,814	27,312
Guarantee Asset
Assets
Beginning balance	2,618	2,869
Acquisitions	0	0
Sales		0
Principal paydowns	0	0
Gains (losses) in net income, net	(932)	(251)
Unrealized losses in OCI, net		0
Other settlements, net	0	0
Ending Balance	1,686	2,618
Shared Home Appreciation Options
Assets
Beginning balance	0
Acquisitions	44,243
Originations	0
Sales	0
Principal paydowns	0
Gains (losses) in net income, net	842
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending Balance	45,085	0
Derivatives
Assets
Beginning balance	2,181	1,714
Acquisitions	0	0
Principal paydowns	0	0
Gains (losses) in net income, net	62,220	(1,214)
Other settlements, net	(55,541)	1,681
Ending Balance	$ 8,860	$ 2,181

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