Segment Reporting - Balance Sheet Data (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Segment Reporting
Total assets	$ 252,275	$ 266,151
Debit and Credit
Segment Reporting
Total assets	190,534	215,846
Prepaid Debit
Segment Reporting
Total assets	35,753	34,734
Other
Segment Reporting
Total assets	$ 25,988	$ 15,571