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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)

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