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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, 2017
USD ($)
Asset-backed securities issued  
Liabilities  
Beginning balance $ 773,462
Acquisitions 0
Sales 0
Principal paydowns (103,372)
Gains (losses) in net income, net 22,516
Unrealized gains in OCI, net 0
Other settlements, net 0
Ending balance 692,606
Residential Loans  
Assets  
Beginning balance 3,886,845
Acquisitions 2,329,355
Sales (2,072,512)
Principal paydowns (277,174)
Gains (losses) in net income, net 39,742
Unrealized losses in OCI, net 0
Other settlements, net (2,046)
Ending balance 3,904,210
Trading securities retained, at fair value  
Assets  
Beginning balance 445,687
Acquisitions 260,351
Sales (61,175)
Principal paydowns (6,409)
Gains (losses) in net income, net 30,107
Unrealized losses in OCI, net 0
Other settlements, net 0
Ending balance 668,561
AFS Securities  
Assets  
Beginning balance 572,752
Acquisitions 27,238
Sales (37,908)
Principal paydowns (28,343)
Gains (losses) in net income, net 17,650
Unrealized losses in OCI, net (1,447)
Other settlements, net 0
Ending balance 549,942
MSRs  
Assets  
Beginning balance 118,526
Acquisitions 7,701
Sales (52,966)
Principal paydowns 0
Gains (losses) in net income, net (9,491)
Unrealized losses in OCI, net 0
Other settlements, net 0
Ending balance 63,770
Guarantee Asset  
Assets  
Beginning balance 4,092
Acquisitions 0
Sales 0
Principal paydowns 0
Gains (losses) in net income, net (804)
Unrealized losses in OCI, net 0
Other settlements, net 0
Ending balance 3,288
Derivatives  
Assets  
Beginning balance (486)
Acquisitions 0
Sales 0
Principal paydowns 0
Gains (losses) in net income, net 20,671
Unrealized losses in OCI, net 0
Other settlements, net (19,065)
Ending balance $ 1,120