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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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Transfers and Servicing [Abstract]        
Proceeds received from securitizations $ 235,175 $ 282,507 $ 674,108 $ 998,204
Servicing fees collected 8,866 9,808 37,610 30,233
Purchases of previously transferred assets, net of claims reimbursed (2,093) (1,507) (3,140) (4,336)
Cash flows received from and paid to securitization trusts $ 241,948 $ 290,808 $ 708,578 $ 1,024,101