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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, 2016
Dec. 31, 2015
Commercial Secured Borrowings    
Assets    
Transfer to FVO   $ 0
Liabilities    
Beginning balance $ 63,152 66,707
Acquisitions 0 0
Sales 0 0
Principal paydowns (306) (593)
Gains (losses) in net income, net 2,369 (3,011)
Unrealized gains in OCI, net 0 0
Other settlements, net (65,215) 49
Ending Balance 0 63,152
Asset-backed securities issued, net    
Assets    
Transfer to FVO   1,302,216
Liabilities    
Beginning balance 996,820 0
Acquisitions 0 0
Sales 0 (1,362)
Principal paydowns (208,215) (312,800)
Gains (losses) in net income, net (8,275) 8,366
Unrealized gains in OCI, net 0 0
Other settlements, net (6,868) 400
Ending Balance 773,462 996,820
Residential Loans    
Assets    
Beginning balance 3,797,551 1,677,984
Transfer to FVO   1,370,699
Acquisitions 4,747,564 5,231,532
Sales (3,813,538) (3,857,807)
Principal paydowns (806,081) (612,473)
Gains (losses) in net income, net (33,893) (6,071)
Unrealized gains in OCI, net 0 0
Other settlements, net (4,758) (6,313)
Ending Balance 3,886,845 3,797,551
Commercial loans    
Assets    
Beginning balance 106,798 237,496
Transfer to FVO   0
Acquisitions 37,625 617,519
Sales (81,523) (754,636)
Principal paydowns (476) (780)
Gains (losses) in net income, net 2,791 7,199
Unrealized gains in OCI, net 0 0
Other settlements, net (65,215) 0
Ending Balance 0 106,798
Trading Securities    
Assets    
Beginning balance 404,011 111,606
Transfer to FVO   0
Acquisitions 292,875 399,990
Sales (244,219) (83,038)
Principal paydowns (17,827) (7,245)
Gains (losses) in net income, net 10,847 (17,302)
Unrealized gains in OCI, net 0 0
Other settlements, net 0 0
Ending Balance 445,687 404,011
AFS Securities    
Assets    
Beginning balance 829,245 1,267,624
Transfer to FVO   0
Acquisitions 34,520 33,370
Sales (252,696) (366,373)
Principal paydowns (62,229) (131,387)
Gains (losses) in net income, net 48,399 72,612
Unrealized gains in OCI, net (24,487) (46,961)
Other settlements, net 0 360
Ending Balance 572,752 829,245
MSRs    
Assets    
Beginning balance 191,976 139,293
Transfer to FVO   0
Acquisitions 25,362 95,281
Sales (62,440) (18,206)
Principal paydowns 0 0
Gains (losses) in net income, net (36,372) (24,392)
Unrealized gains in OCI, net 0 0
Other settlements, net 0 0
Ending Balance 118,526 191,976
Guarantee Asset    
Assets    
Beginning balance 5,697 7,201
Transfer to FVO   0
Acquisitions 0 0
Sales 0 0
Principal paydowns 0 0
Gains (losses) in net income, net (1,605) (1,377)
Unrealized gains in OCI, net 0 0
Other settlements, net 0 (127)
Ending Balance 4,092 5,697
Derivatives    
Assets    
Beginning balance 3,208 1,119
Transfer to FVO   0
Acquisitions 0 0
Sales 0 0
Principal paydowns 0 0
Gains (losses) in net income, net 30,193 60,823
Unrealized gains in OCI, net 0 0
Other settlements, net (33,887) (58,734)
Ending Balance $ (486) $ 3,208