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Loans to Bank Customers - Troubled Debt Restructurings (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Residential    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 262 $ 290
Carrying Value 196 221
Installment    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 142 160
Carrying Value $ 138 $ 48