Qualifications
Think of banking like any managerial position at a retail chain store. You don't have to do anything other than be charismatic and prove you're good at your job. But to move up the ranks, which is never easy to do, you need to arm yourself as best you can. First step: get a bachelor's degree in accounting, business administration, or finance (source).
Just don't get so interested in your major that suddenly you want to become a maverick investor at a hedge fund. You don't need that kind of stress in your life. Focus on acquiring mid-level management skills.
And what does any mid-tier manager need? Skills in Microsoft Office, of course. You probably already have those skills, which puts you well on your way. Alongside your basic Word skills, you'll need to know your way around accounting software, a ten-key calculator, and federal and state banking regulations.
You'll also need experience. You can be a certified financial planner and rattle off knowledge about refinancing your home until the cows come home, but unless you have experience in the field, no one's giving you a promotion. Some banks have graduate management trainee programs, while others ask you to earn that managerial position the hard way: after five or ten years of cranking out superb results.