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Securitizations and Variable Interests Entities - Summary of Cash Flows Received from and Paid to Securitization Trusts Related to Transfers Accounted for as Sales Outstanding (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Transfers and Servicing [Abstract]      
Proceeds received from securitizations $ 5,197,071 $ 4,970,454 $ 5,265,183
Servicing fees collected 14,616 29,239 25,438
Purchases of previously transferred assets, net of claims reimbursed (1,271) (2,863) 4,973
Cash flows between transferor and transferee proceeds and payment related to transfers accounted for sales $ 5,210,416 $ 4,996,830 $ 5,295,594