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Guarantees - Changes from credit recourses agreements (Details) - Financial Guarantee - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Guarantor Obligations        
Balance as of beginning of period $ 31,305 $ 48,100 $ 34,862 $ 56,230
Impact of adopting CECL 0 0 (3,831) 0
Provision for recourse liability (4,058) 2,755 1,356 3,711
Net charge-offs (362) (5,394) (5,502) (14,480)
Balance as of end of period $ 26,885 $ 45,461 $ 26,885 $ 45,461