It sucks, but most likely will go up. With your car being parked and hit, you are clearly not at fault, but;;;;;;;;you are filing a claim to have the damages fixed. You will always pay the $500 deductible if your company fixes it, regardless of fault, unless;;;;they know the person responsible, then they go after the at fault person for the insurance company's money plus your deductible. Since hit/run, both you and your insurance company is out of the money and no one to collect from.
Even though the 2008 accident was split both ways, it is still considered at fault, since it was not 100% against the other driver.
Most companies will rate your premium on ALL accidents, fault or not, up to 3 years and some up to 5 years. The rate increase goes in effect when your policy renews. It will also drop off 3 years when it renews, so sometimes depending on when the accident happened, could pay more/less till renewal.
So your 2008 accident should fall off soon, but now you still will have the 2009 till 2012 and also this new hit/run.
I suggest that prior to your renewal, you get quotes from other companies. You may find other companies that will be less than State Farm.