From the OP description this sounds like a pretty substantial bend. I wouldn't feel comfortable bending it back and continuing to ride it since I'd worry about the stress possibly leading to the formation of a crack in the fork or steerer tube. The steerer is hidden inside the headtube and therefore difficult to inspect and a crack can grow unnoticed and then lead to a sudden failure. That happened on one of my bikes and resulted in a very nasty crash. One moment we were riding along and the next moment the front wheel and fork were no longer attached to the bike. Get the driver's insurance company buy you a new fork and replace whatever other damaged parts may be on the bike.