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Loans to Bank Customers - Troubled Debt Restructurings (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Residential    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, unpaid principal balance $ 422 $ 516
Financing receivable, modifications, recorded investment 344 452
Installment    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, unpaid principal balance 209 262
Financing receivable, modifications, recorded investment $ 60 $ 120