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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Transfers and Servicing [Abstract]        
Proceeds received from securitizations $ 5,823,765 $ 2,364,829 $ 12,220,596 $ 4,256,082
Servicing fees collected 16,440 12,561 43,968 35,204
Purchases of previously transferred assets, net of claims reimbursed (6,065) (2,061) (16,085) (6,338)
Cash flows between transferor and transferee proceeds and payment related to transfers accounted for sales $ 5,834,140 $ 2,375,329 $ 12,248,479 $ 4,284,948