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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Loss Contingencies [Line Items]    
Customer credits and transaction losses, reimbursement amount $ 4.1  
Line of Credit [Member] | Standby Letters of Credit [Member]    
Loss Contingencies [Line Items]    
Letters of credit outstanding, amount $ 1.5 $ 1.5