Personally, I would have gone with a white bench.

I would prefer matching chairs. A bench at the head of a table seems incongruous to me. It's like you swiped the bench from the piano in a pinch.

I’m never a fan of benches at a dining table mostly because they are not comfortable to sit at. But kudos to you for having benches for the host and hostess (at least it looks that way) and having guests seated in more comfortable chairs!
Usually it’s the other way around, which I think is pretty inconsiderate!

I actually think this looks very cozy and functional. I wouldn't sit parents on the bench but I'd have no problem with husband & I taking the least comfortable seat for a few hours.