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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, 2018 USD ($)
ABS Issued
Liabilities
Beginning balance	$ 1,164,585
Acquisitions	925,845
Sales	0
Principal paydowns	(181,782)
Gains (losses) in net income, net	21,014
Unrealized gains in OCI, net	0
Other settlements, net	0
Ending balance	1,929,662
Residential Loans
Assets
Beginning balance	5,114,317
Acquisitions	3,766,510
Sales	(3,002,879)
Principal paydowns	(365,392)
Gains (losses) in net income, net	(19,665)
Unrealized losses in OCI, net	0
Other settlements, net	(1,836)
Ending balance	5,491,055
Trading securities
Assets
Beginning balance	968,844
Acquisitions	361,535
Sales	(260,119)
Principal paydowns	(11,748)
Gains (losses) in net income, net	(4,217)
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending balance	1,054,295
AFS Securities
Assets
Beginning balance	507,666
Acquisitions	5,952
Sales	(92,110)
Principal paydowns	(22,226)
Gains (losses) in net income, net	21,930
Unrealized losses in OCI, net	(21,571)
Other settlements, net	0
Ending balance	399,641
MSRs
Assets
Beginning balance	63,598
Acquisitions	0
Sales	(1,077)
Principal paydowns	0
Gains (losses) in net income, net	2,153
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending balance	64,674
Guarantee Asset
Assets
Beginning balance	2,869
Acquisitions	0
Sales	0
Principal paydowns	0
Gains (losses) in net income, net	67
Unrealized losses in OCI, net	0
Other settlements, net	0
Ending balance	2,936
Derivatives
Assets
Beginning balance	1,714
Acquisitions	0
Sales	0
Principal paydowns	0
Gains (losses) in net income, net	(9,681)
Unrealized losses in OCI, net	0
Other settlements, net	6,257
Ending balance	$ (1,710)

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