Accounts Receivable - Reserve for uncollectible overdrawn accounts activity (Details) - Reserve for uncollectible overdrawn accounts [Member] - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2015 |
Jun. 30, 2014 |
Jun. 30, 2015 |
Jun. 30, 2014 |
|
| Uncollectible Overdrawn Accounts [Roll Forward] | ||||
| Balance, beginning of period | $ 12,580 | $ 9,165 | $ 11,196 | $ 10,363 |
| Fees | 13,737 | 6,663 | 27,381 | 14,403 |
| Purchase transactions | 2,637 | 906 | 4,185 | 1,656 |
| Charge-offs | (16,915) | (8,179) | (30,723) | (17,867) |
| Balance, end of period | $ 12,039 | $ 8,555 | $ 12,039 | $ 8,555 |