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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Transfers and Servicing [Abstract]        
Proceeds received from securitizations $ 3,147,912 $ 1,071,252 $ 6,396,831 $ 1,891,253
Servicing fees collected 14,350 10,391 27,528 22,643
Purchases of previously transferred assets, net of claims reimbursed (6,780) (1,669) (10,019) (4,277)
Cash flows between transferor and transferee proceeds and payment related to transfers accounted for sales $ 3,155,482 $ 1,079,974 $ 6,414,340 $ 1,909,619