Check from insurance company higher than cost of repair.

I had my card hit in a parking lot while I was shopping. The damage was estimated to $1,850 by the insurance company. My deductible is $500 so I got a $1,350 check. I've gotten the repair done at a shop for $850. However, I have to get the check signed by the lien holder (bank) before it can be cashed. How will this work out? Who keeps the $500 which is the difference between the check I got and the actual cost of repair? I want to make sure I do not do something stupid here.