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Loans to Bank Customers Nonperforming Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Nonperforming Loans [Line Items]    
Nonperforming loans $ 863 $ 693
Residential Portfolio Segment [Member]    
Nonperforming Loans [Line Items]    
Nonperforming loans 649 502
Installment Portfolio Segment [Member]    
Nonperforming Loans [Line Items]    
Nonperforming loans $ 214 $ 191