I second that answer. You probably already know this, but you'll definitely be getting a snail mail notification as well as e-mail. I think they also announce it in their magazine. I received mine via e-mail and skimmed it; didn't read the entire thing.
Very true, one should never 'count' on it always coming. However, this is one of the things I love about USAA (the dividend). I get discounts on many products due to my membership length w/ the bank as well as the number of products I have. I agree, it's not much, however I've never heard of a bank giving money back to customers. ;)