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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, 2017
Dec. 31, 2016
Commercial Secured Borrowings    
Liabilities    
Beginning balance $ 0 $ 63,152
Acquisitions   0
Sales   0
Principal paydowns   (306)
Gains (losses) in net income, net   2,369
Unrealized losses in OCI, net   0
Other settlements, net   (65,215)
Ending Balance   0
ABS issued    
Liabilities    
Beginning balance 773,462 996,820
Acquisitions 567,099 0
Sales 0 0
Principal paydowns (205,163) (208,215)
Gains (losses) in net income, net 29,187 (8,275)
Unrealized losses in OCI, net 0 0
Other settlements, net 0 (6,868)
Ending Balance 1,164,585 773,462
Residential Loans    
Assets    
Beginning balance 3,886,845 3,797,551
Acquisitions 5,741,427 4,747,564
Sales (3,982,683) (3,813,538)
Principal paydowns (573,168) (806,081)
Gains (losses) in net income, net 46,119 (33,893)
Unrealized losses in OCI, net 0 0
Other settlements, net (4,223) (4,758)
Ending Balance 5,114,317 3,886,845
Commercial Loans    
Assets    
Beginning balance 0 106,798
Acquisitions   37,625
Sales   (81,523)
Principal paydowns   (476)
Gains (losses) in net income, net   2,791
Unrealized losses in OCI, net   0
Other settlements, net   (65,215)
Ending Balance   0
Trading Securities    
Assets    
Beginning balance 445,687 404,011
Acquisitions 640,760 292,875
Sales (137,886) (244,219)
Principal paydowns (19,224) (17,827)
Gains (losses) in net income, net 39,507 10,847
Unrealized losses in OCI, net 0 0
Other settlements, net 0 0
Ending Balance 968,844 445,687
AFS Securities    
Assets    
Beginning balance 572,752 829,245
Acquisitions 39,700 34,520
Sales (90,440) (252,696)
Principal paydowns (58,554) (62,229)
Gains (losses) in net income, net 31,892 48,399
Unrealized losses in OCI, net 12,316 (24,487)
Other settlements, net 0 0
Ending Balance 507,666 572,752
MSRs    
Assets    
Beginning balance 118,526 191,976
Acquisitions 8,026 25,362
Sales (52,788) (62,440)
Principal paydowns 0 0
Gains (losses) in net income, net (10,166) (36,372)
Unrealized losses in OCI, net 0 0
Other settlements, net 0 0
Ending Balance 63,598 118,526
Guarantee Asset    
Assets    
Beginning balance 4,092 5,697
Acquisitions 0 0
Sales 0 0
Principal paydowns 0 0
Gains (losses) in net income, net (1,223) (1,605)
Unrealized losses in OCI, net 0 0
Other settlements, net 0 0
Ending Balance 2,869 4,092
Derivatives    
Assets    
Beginning balance (486) 3,208
Acquisitions 0 0
Sales 0 0
Principal paydowns 0 0
Gains (losses) in net income, net 37,220 30,193
Unrealized losses in OCI, net 0 0
Other settlements, net (35,020) (33,887)
Ending Balance $ 1,714 $ (486)