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Loans to Bank Customers - Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount $ 21,917 $ 18,570
Non-Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 22,485 18,025
Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 766 836
Residential | Non-Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 3,373 3,038
Residential | Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 422 516
Commercial | Non-Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 180 315
Commercial | Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 0 0
Installment | Non-Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 665 1,059
Installment | Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 344 320
Secured credit card | Non-Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 18,267 13,613
Secured credit card | Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount $ 0 $ 0