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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	3 Months Ended
	Mar. 31, 2019 USD ($)
Contingent Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2018	$ 0
Acquisitions	24,621
Principal paydowns	0
Gains (losses) in net income, net	0
Other settlements, net	0
Ending Balance - March 31, 2019	24,621
ABS Issued
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2018	5,410,073
Acquisitions	330,535
Principal paydowns	(163,146)
Gains (losses) in net income, net	60,182
Other settlements, net	0
Ending Balance - March 31, 2019	5,637,644
Residential Loans
Assets
Beginning balance	7,254,631
Acquisitions	1,022,198
Originations	0
Sales	(833,078)
Principal paydowns	(240,406)
Gains (losses) in net income, net	70,833
Unrealized losses in OCI, net	0
Other settlements, net	13
Ending balance	7,274,191
Business purpose residential loans, at fair value
Assets
Beginning balance	141,258
Acquisitions	29,093
Originations	35,968
Sales	(20,590)
Principal paydowns	(20,992)
Gains (losses) in net income, net	871
Unrealized losses in OCI, net	0
Other settlements, net	(4,996)
Ending balance	160,612
Multifamily loans, held-for-investment, at fair value
Assets
Beginning balance	2,144,598
Acquisitions	0
Originations	0
Sales	0
Principal paydowns	(3,071)
Gains (losses) in net income, net	34,372
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending balance	2,175,899
Trading securities
Assets
Beginning balance	1,118,612
Acquisitions	152,587
Originations	0
Sales	(32,002)
Principal paydowns	(5,832)
Gains (losses) in net income, net	21,859
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending balance	1,255,224
AFS Securities
Assets
Beginning balance	333,882
Acquisitions	4,885
Originations	0
Sales	(42,016)
Principal paydowns	(18,666)
Gains (losses) in net income, net	12,616
Unrealized losses in OCI, net	(2,773)
Other settlements, net	0
Ending balance	287,928
Servicer Advance Investments
Assets
Beginning balance	300,468
Acquisitions	68,976
Originations	0
Sales	0
Principal paydowns	(66,532)
Gains (losses) in net income, net	1,008
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending balance	303,920
MSRs
Assets
Beginning balance	60,281
Acquisitions	104
Originations	0
Sales	0
Principal paydowns	0
Gains (losses) in net income, net	(5,101)
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending balance	55,284
Excess MSRs
Assets
Beginning balance	27,312
Acquisitions	2,117
Originations	0
Sales	0
Principal paydowns	0
Gains (losses) in net income, net	(437)
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending balance	28,992
Guarantee Asset
Assets
Beginning balance	2,618
Acquisitions	0
Originations	0
Sales	0
Principal paydowns	0
Gains (losses) in net income, net	(276)
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending balance	2,342
Derivatives
Assets
Beginning balance	2,181
Acquisitions	0
Principal paydowns	0
Gains (losses) in net income, net	11,452
Other settlements, net	(9,438)
Ending balance	$ 4,195

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