Acquired Card Receivables - Summary of Transferred Card Receivables by Class (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021
Financing Receivable, Past Due [Line Items]
Total	$ 42,905	$ 29,525
Current and Less than 30 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	41,372	28,687
30 ~ 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	861	240
60 ~ 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	444	165
90 ~ 119 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	219	301
Over 119 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	$ 9	$ 132