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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, 2018
Mar. 31, 2017
Disclosure of Transfer of Securitizations or Asset-backed Financing Financial Assets Accounted for as Sale [Abstract]    
Proceeds received from securitizations $ 377,499 $ 1,001,997
Servicing fees collected 10,348 10,108
Purchases of previously transferred assets, net of claims reimbursed (2,170) (987)
Cash flows received from and paid to securitization trusts $ 385,677 $ 1,011,118