This post is by our regular contributor, Erin. Have you ever paused to consider what kind of bank you're doing business with? Or have you just gone with the one your parents signed you up with, or the one that was closest to your home? A lot of people don't think too much about the bank they choose, but it can affect a lot of things - the fees you pay, the interest rates you're eligible for on loans, and how much you can earn on your money. You might be aware that credit unions are often touted as the…