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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, 2018	Dec. 31, 2017
ABS issued
Liabilities
Beginning balance	$ 1,164,585	$ 773,462
Acquisitions	4,613,168	567,099
Sales		0
Principal paydowns	(459,173)	(205,163)
Gains (losses) in net income, net	91,493	29,187
Unrealized losses in OCI, net		0
Other settlements, net	0	0
Ending Balance	5,410,073	1,164,585
Residential Loans
Assets
Beginning balance	5,114,317	3,886,845
Acquisitions	8,338,724	5,741,427
Sales	(5,425,168)	(3,982,683)
Principal paydowns	(814,122)	(573,168)
Gains (losses) in net income, net	44,627	46,119
Unrealized losses in OCI, net	0	0
Other settlements, net	(3,747)	(4,223)
Ending Balance	7,254,631	5,114,317
Business purpose residential loans
Assets
Beginning balance	0
Acquisitions	167,777
Sales	0
Principal paydowns	(27,382)
Gains (losses) in net income, net	863
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending Balance	141,258	0
Multifamily loans
Assets
Beginning balance	0
Acquisitions	2,099,916
Sales	0
Principal paydowns	(1,873)
Gains (losses) in net income, net	46,555
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending Balance	2,144,598	0
Trading securities
Assets
Beginning balance	968,844	445,687
Acquisitions	653,739	640,760
Sales	(438,304)	(137,886)
Principal paydowns	(40,050)	(19,224)
Gains (losses) in net income, net	(8,436)	39,507
Unrealized losses in OCI, net	0	0
Other settlements, net	(17,181)	0
Ending Balance	1,118,612	968,844
AFS Securities
Assets
Beginning balance	507,666	572,752
Acquisitions	7,739	39,700
Sales	(143,644)	(90,440)
Principal paydowns	(44,446)	(58,554)
Gains (losses) in net income, net	41,051	31,892
Unrealized losses in OCI, net	(34,484)	12,316
Other settlements, net	0	0
Ending Balance	333,882	507,666
Servicer advance investments
Assets
Beginning balance	0
Acquisitions	395,813
Sales	0
Principal paydowns	(94,644)
Gains (losses) in net income, net	(701)
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending Balance	300,468	0
MSRs
Assets
Beginning balance	63,598	118,526
Acquisitions	328	8,026
Sales	(1,077)	(52,788)
Principal paydowns	0	0
Gains (losses) in net income, net	(2,568)	(10,166)
Unrealized losses in OCI, net	0	0
Other settlements, net	0	0
Ending Balance	60,281	63,598
Excess MSRs
Assets
Beginning balance	0
Acquisitions	25,489
Sales	0
Principal paydowns	0
Gains (losses) in net income, net	1,823
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending Balance	27,312	0
Guarantee Asset
Assets
Beginning balance	2,869	4,092
Acquisitions	0	0
Sales	0	0
Principal paydowns	0	0
Gains (losses) in net income, net	(251)	(1,223)
Unrealized losses in OCI, net	0	0
Other settlements, net	0	0
Ending Balance	2,618	2,869
Derivatives
Assets
Beginning balance	1,714	(486)
Acquisitions	0	0
Sales		0
Principal paydowns	0	0
Gains (losses) in net income, net	(1,214)	37,220
Unrealized losses in OCI, net		0
Other settlements, net	1,681	(35,020)
Ending Balance	$ 2,181	$ 1,714

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