Acquired Card Receivables - Summary of Acquired Card Receivables by Class (Details) $ in Thousands	Jun. 30, 2021 USD ($)
Acquired Card Receivables [Line Items]
Total	$ 148,833
Current and Less than 30 Days Past Due
Acquired Card Receivables [Line Items]
Total	145,993
30 ~ 59 Days Past Due
Acquired Card Receivables [Line Items]
Total	1,188
60 ~ 89 Days Past Due
Acquired Card Receivables [Line Items]
Total	580
90 ~ 119 Days Past Due
Acquired Card Receivables [Line Items]
Total	713
Over 119 Days Past Due
Acquired Card Receivables [Line Items]
Total	$ 359