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Loans to Bank Customers Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount $ 21,628 $ 18,570
Non-Classified [Member]    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 21,790 18,025
Classified [Member]    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 1,011 836
Residential Portfolio Segment [Member] | Non-Classified [Member]    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 3,405 3,038
Residential Portfolio Segment [Member] | Classified [Member]    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 649 516
Commercial Portfolio Segment [Member] | Non-Classified [Member]    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 323 315
Commercial Portfolio Segment [Member] | Classified [Member]    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 0 0
Installment Portfolio Segment [Member] | Non-Classified [Member]    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 695 1,059
Installment Portfolio Segment [Member] | Classified [Member]    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 362 320
Credit Card Receivable [Member] | Non-Classified [Member]    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount 17,367 13,613
Credit Card Receivable [Member] | Classified [Member]    
Outstanding Loans [Line Items]    
Loans to bank customers, carrying amount $ 0 $ 0