I paid my down payment dealership will bank require one to them as well?

Ok so I got approved for a car loan. But my bank needed additional paperwork before they would fax approval certification. I found a car I wanted at the dealership and told them this but the bank was closed. The car I wanted was 1500 more then the loan I was approved for so I paid that out of pocket... now as im waiting till monday to go in and finish this. I began thinking... is my bank going to want a down payment on their loan as well? Cause if so im screwed. I already put all the money I had down at the dealership... or will the bank see that 1500 as their down payment? They never said anything to me about being required to put a certain ammount down? And if they do and I can't... what is going to happen? I already signed the purchase agreement and am going in monday to work with them and my bank