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Loans to Bank Customers - Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount $ 18,943 $ 21,363
Non-Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 18,517 20,715
Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 1,374 1,792
Residential | Non-Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 2,697 2,935
Residential | Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 338 403
Commercial | Non-Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 119 193
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 657 632
Installment | Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 264 275
Secured credit card | Non-Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 15,044 16,955
Secured credit card | Classified    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount $ 772 $ 1,114