Vapor Barrier vs Retarder

Insulating my walls with unfaced insulation in Scranton PA. I have been advised that Vapor barriers are required by code here but I am having trouble understanding how my insulation will survive in the summer (and winter). Currently my exterior has Tyvek and 1/4" Kingsuard insulation all around the house under the siding.

On the interior would I, or should I use a vapor retarder or a barrier, I am worried that my exterior insulation will trap moisture in as well as using a vapor barrier on the inside. I am having trouble with understanding the best possible combination for my climate.

(Apologies if wrong sub)