"How do I go to the bank?"
I'm with you as a learner so press X to doubt:
I believe with へ you would be asking how to be in the general direction of the bank. Let's say contextually you got into a park that felt kinda like a maze after and hour of talking with friends. And you ask: "Hey, I need to go to the bank, which way to go about it? (へ)"
But here, you're more like asking something of this sort: "Hey, how do I go about until (まで)reaching the bank?"
So instead of getting a reply that says - "just go in that direction へ"
You get - "Ah, you exit that way, then you go two blocks down but make sure not to reach the cafe, turn right after passing the funeral home and make sure you look both ways before crossing the road or you will be visiting it before seeing the bank. Oh the bank should be in your field of vision as you come up that street incline."