Crush 20 of the wafers to form coarse crumbs; set aside. Add dry pudding mix to milk in medium bowl. Beat with wire whisk 2 min. Gently stir in whipped topping.
Layer half of the crumbs and 8 of the banana slices in four individual dessert dishes; cover with half of the pudding mixture. Repeat layers, reserving 4 of the banana slices for garnish. Cover and refrigerate parfaits at least 15 min.
Top each parfait with 1 each of the reserved wafers and banana slices just before serving.