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Securitizations and Variable Interest Entities - Schedule of Cash Flows Related to Transfers Accounted for as Sales (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Disclosure of Transfer of Securitizations or Asset-backed Financing Financial Assets Accounted for as Sale [Abstract]    
Proceeds received from securitizations $ 1,001,997 $ 1,009,264
Servicing fees collected 10,108 3,124
Purchases of previously transferred assets, net of claims reimbursed (987) (13)
Cash flows received from and paid to securitization trusts $ 1,011,118 $ 1,012,375