There is a public figure named , but she is a professional adult film performer born in 1993, not associated with criminal activity or the "thief" archetype in film or history.
There is no prominent figure in public records or entertainment media known as "Cassidy Banks thief." It is likely you are combining two distinct figures: the legendary Old West outlaw and a fictional thief from the TV series Riverdale named Cassidy Bullock . The Real Outlaw: Butch Cassidy
If you are thinking of a modern character, was a minor antagonist in the second season of the series Riverdale .