There's MANY different departments and jobs at the bank, I only worked in branches so far. There' lots to be aware of, from handling cash to interacting with customers, to selling insurance, to settling credit card bills, and more. Not much to slack around on this job, unless there's a rare day where you have next to no customers (if you work at the branch).
However, the most enjoyable thing is also interacting with colleagues and customers, making friends with them and being part of a huge organisation which does give good benefits.
branch - short lunch break