Using computers in a bank or any other business makes you an end user. The software the business uses will require you to be trained on that software. You don't have to know how the computers work or about the nuts and bolts of the software. Just how to use it.
If you're wanting to work in a bank as an IT, then you'll be working at a remote location not at the branch itself. If there's a problem some one knowledgeable with the software will call you and you'll remote in. Most branches run off a network out of a secure location. You'll be aware of a problem before your phone rings.
Either way at a bank or a branch or a home office, the security checks you have to go through are getting extreme. If you farted wrong in church it could come back to haunt you.
