What classes should I take for a career in banking?

I have worked for an H.E.B. in the business center for a while, so I have some expierence in the area. For those of you who don't know, H.E.B. is a grocery store you can find in Texas, and I believe some of Louisianna and Mexico. I work in the business center where we cash checks, send money through Western Union, and other tasks handling money. I would like to know what classes I should take to develop a career with a bank. Could anyone help me with ideas or their personal expierences?