Segment Reporting - Balance Sheet Data (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 264,420	$ 280,353
Operating Segments | U.S. Debit and Credit
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	205,417	221,274
Operating Segments | U.S. Prepaid Debit
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	23,509	20,960
Operating Segments | U.K. Limited
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	26,060	25,897
Operating Segments | Other
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 9,434	$ 12,222