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Loans to Bank Customers - Nonperforming Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Nonperforming Loans [Line Items]    
Nonperforming loans $ 597 $ 693
Residential    
Nonperforming Loans [Line Items]    
Nonperforming loans 422 502
Installment    
Nonperforming Loans [Line Items]    
Nonperforming loans $ 175 $ 191