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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	9 Months Ended
	Sep. 30, 2018 USD ($)
ABS Issued
Liabilities
Beginning balance	$ 1,164,585
Acquisitions	2,539,451
Sales	0
Principal paydowns	(305,529)
Gains (losses) in net income, net	8,478
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending balance	3,406,985
Residential Loans
Assets
Beginning balance	5,114,317
Acquisitions	5,570,683
Sales	(4,135,911)
Principal paydowns	(587,162)
Gains (losses) in net income, net	(37,641)
Unrealized losses in OCI, net	0
Other settlements, net	(2,140)
Ending balance	5,922,146
Business purpose loans, at fair value
Assets
Beginning balance	0
Acquisitions	126,214
Sales	0
Principal paydowns	(10,912)
Gains (losses) in net income, net	318
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending balance	115,620
Multifamily loans, held-for-investment, at fair value
Assets
Beginning balance	0
Acquisitions	946,650
Sales	0
Principal paydowns	(286)
Gains (losses) in net income, net	(4,199)
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending balance	942,165
Trading securities
Assets
Beginning balance	968,844
Acquisitions	522,293
Sales	(348,054)
Principal paydowns	(25,847)
Gains (losses) in net income, net	2,098
Unrealized losses in OCI, net	0
Other settlements, net	(11,091)
Ending balance	1,108,243
AFS Securities
Assets
Beginning balance	507,666
Acquisitions	6,728
Sales	(118,423)
Principal paydowns	(35,431)
Gains (losses) in net income, net	32,494
Unrealized losses in OCI, net	(31,193)
Other settlements, net	0
Ending balance	361,841
MSRs
Assets
Beginning balance	63,598
Acquisitions	0
Sales	(1,077)
Principal paydowns	0
Gains (losses) in net income, net	1,264
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending balance	63,785
Guarantee Asset
Assets
Beginning balance	2,869
Acquisitions	0
Sales	0
Principal paydowns	0
Gains (losses) in net income, net	16
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending balance	2,885
Derivatives
Assets
Beginning balance	1,714
Acquisitions	0
Sales	0
Principal paydowns	0
Gains (losses) in net income, net	(8,093)
Unrealized losses in OCI, net	0
Other settlements, net	6,162
Ending balance	$ (217)

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