....'That guy is a complete and utter banker'.
I've always found that bankers, stock market guys, and certain political types are of that particular personality type that gets off on whipping up fear, uncertainty and doubt. They either are not happy until they've got everyone worried about the future, or they like to magnify a minor incident into a international incident.
An Australian dictionary also defines an alternate meaning for the word 'banker'...."a river near flood level, the water being almost bank high". Sounds suitably crisis-like for the banking profession.