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Loans to Bank Customers - Nonperforming Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Nonperforming Loans [Line Items]    
Nonperforming loans $ 3,802 $ 1,686
Residential    
Nonperforming Loans [Line Items]    
Nonperforming loans 308 403
Installment    
Nonperforming Loans [Line Items]    
Nonperforming loans 150 169
Secured credit card    
Nonperforming Loans [Line Items]    
Nonperforming loans $ 3,344 $ 1,114