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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, 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	311
Other settlements, net	0
Ending Balance - June 30, 2019	24,932
ABS Issued
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance - December 31, 2018	5,410,073
Acquisitions	1,738,537
Principal paydowns	(416,791)
Gains (losses) in net income, net	181,310
Other settlements, net	0
Ending Balance - June 30, 2019	6,913,129
Residential Loans
Assets
Beginning balance	7,254,631
Acquisitions	2,583,951
Originations	0
Sales	(2,088,273)
Principal paydowns	(614,975)
Gains (losses) in net income, net	147,969
Unrealized losses in OCI, net	0
Other settlements, net	(47)
Ending balance	7,283,256
Business purpose residential loans, at fair value
Assets
Beginning balance	141,258
Acquisitions	29,093
Originations	169,562
Sales	(43,548)
Principal paydowns	(43,931)
Gains (losses) in net income, net	3,416
Unrealized losses in OCI, net	0
Other settlements, net	(4,996)
Ending balance	250,854
Multifamily loans, held-for-investment, at fair value
Assets
Beginning balance	2,144,598
Acquisitions	1,481,554
Originations	0
Sales	0
Principal paydowns	(7,516)
Gains (losses) in net income, net	131,021
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending balance	3,749,657
Trading securities
Assets
Beginning balance	1,118,612
Acquisitions	240,478
Originations	0
Sales	(174,216)
Principal paydowns	(14,836)
Gains (losses) in net income, net	40,302
Unrealized losses in OCI, net	0
Other settlements, net	(4,951)
Ending balance	1,205,389
AFS Securities
Assets
Beginning balance	333,882
Acquisitions	8,954
Originations	0
Sales	(67,001)
Principal paydowns	(24,207)
Gains (losses) in net income, net	17,503
Unrealized losses in OCI, net	2,966
Other settlements, net	0
Ending balance	272,097
Servicer Advance Investments
Assets
Beginning balance	300,468
Acquisitions	68,976
Originations	0
Sales	0
Principal paydowns	(111,662)
Gains (losses) in net income, net	1,440
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending balance	259,222
MSRs
Assets
Beginning balance	60,281
Acquisitions	868
Originations	0
Sales	0
Principal paydowns	0
Gains (losses) in net income, net	(13,753)
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending balance	47,396
Excess MSRs
Assets
Beginning balance	27,312
Acquisitions	6,810
Originations	0
Sales	0
Principal paydowns	0
Gains (losses) in net income, net	(502)
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending balance	33,620
Guarantee Asset
Assets
Beginning balance	2,618
Acquisitions	0
Originations	0
Sales	0
Principal paydowns	0
Gains (losses) in net income, net	(619)
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending balance	1,999
Derivatives
Assets
Beginning balance	2,181
Acquisitions	0
Principal paydowns	0
Gains (losses) in net income, net	28,908
Other settlements, net	(26,294)
Ending balance	$ 4,795

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