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Loans to Bank Customers Troubled Debt Restructurings (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Residential Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, unpaid principal balance $ 649 $ 516
Financing receivable, modifications, recorded investment 529 452
Installment Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired financing receivable, unpaid principal balance 214 262
Financing receivable, modifications, recorded investment $ 63 $ 120