Snow Bank pushed pushed bumper out of snaps ?

[YodaBird]

I hit a snow bank, more like an ice bank of snow today; resulting in my rear bumper coming out causing a half an inch gap along the seam, and around the gas tank, compared to the other side of the car.

Can it be fixed so as there is no more space ? It looks as if there are snap clips which the bumper has to be aligned and snapped in, if I'm correctly ? I tried, although unsuccessful; odds are I'll have to visit the dealer to get it fixed.