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Loans to Bank Customers - Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount $ 20,906 $ 21,363
Non-Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 18,593 20,715
Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 3,871 1,792
Residential | Non-Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 2,623 2,935
Residential | Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 308 403
Commercial | Non-Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 180 193
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 491 632
Installment | Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 219 275
Secured credit card | Non-Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 15,299 16,955
Secured credit card | Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount $ 3,344 $ 1,114