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Loans to Bank Customers - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Allowance for Loan Losses [Roll Forward]        
Balance, beginning of period $ 970 $ 1,173 $ 1,144 $ 291
Provision for loans 658 1,036 1,914 2,270
Loans charged off (112) (964) (1,661) (1,598)
Recoveries of loans previously charged off 42 89 161 371
Balance, end of period $ 1,558 $ 1,334 $ 1,558 $ 1,334