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Notes Payable Schedule of structured financing notes at fair value (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total structured financing notes reported at fair value that are secured by credit card receivables and to which we are subordinated $ 9,240,000 $ 12,276,000
Debt, Weighted Average Interest Rate [1],[2] 6.00% 5.40%
Credit card receivables and restricted cash carrying amount as security for notes payable $ 9,200,000  
Maturity date Nov. 30, 2035  
Debt Instrument, Interest Rate, Effective Percentage 9.20%  
Loans Pledged as Collateral [1],[2] $ 77,900,000 $ 69,900,000
Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Total structured financing notes reported at fair value that are secured by credit card receivables and to which we are subordinated 9,200,000 12,300,000
Amortizing Securitization Facility Expiration Date December 1, 2021 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 101,300,000.0 $ 102,000,000
Debt, Weighted Average Interest Rate 6.70% 6.10%
Credit card receivables and restricted cash carrying amount as security for notes payable $ 9,200,000.0 $ 12,300,000
Maturity date Dec. 01, 2021  
[1] (2)Loans are subject to certain affirmative covenants tied to default rates and other performance metrics the failure of which could result in required early repayment of the remaining unamortized balances of the notes.
[2] (3)These notes reflect modifications to either extend the maturity date, increase the loaned amount or both.