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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
3 Months Ended
Mar. 31, 2017
USD ($)
Asset-backed securities issued  
Liabilities  
Beginning balance $ 773,462
Acquisitions 0
Sales 0
Principal paydowns (55,609)
Gains (losses) in net income, net 10,538
Unrealized gains in OCI, net 0
Other settlements, net 0
Ending balance 728,391
Residential Loans  
Assets  
Beginning balance 3,886,845
Acquisitions 1,108,332
Sales (1,377,574)
Principal paydowns (160,102)
Gains (losses) in net income, net 14,504
Unrealized losses in OCI, net 0
Other settlements, net (964)
Ending balance 3,471,041
Trading securities retained, at fair value  
Assets  
Beginning balance 445,687
Acquisitions 145,396
Sales (8,279)
Principal paydowns (2,836)
Gains (losses) in net income, net 11,184
Unrealized losses in OCI, net 0
Other settlements, net 0
Ending balance 591,152
AFS Securities  
Assets  
Beginning balance 572,752
Acquisitions 25,333
Sales (18,456)
Principal paydowns (14,693)
Gains (losses) in net income, net 10,848
Unrealized losses in OCI, net (996)
Other settlements, net 0
Ending balance 574,788
MSRs  
Assets  
Beginning balance 118,526
Acquisitions 7,485
Sales (11,928)
Principal paydowns 0
Gains (losses) in net income, net (3,070)
Unrealized losses in OCI, net 0
Other settlements, net 0
Ending balance 111,013
Guarantee Asset  
Assets  
Beginning balance 4,092
Acquisitions 0
Sales 0
Principal paydowns 0
Gains (losses) in net income, net (246)
Unrealized losses in OCI, net 0
Other settlements, net 0
Ending balance 3,846
Derivatives  
Assets  
Beginning balance (486)
Acquisitions 0
Sales 0
Principal paydowns 0
Gains (losses) in net income, net 10,265
Unrealized losses in OCI, net 0
Other settlements, net (4,992)
Ending balance $ 4,787