Preheat over to 350. Line bottom of a greased 9x5 inch loaf pan with parchment paper; grease paper.
In a large bowl, cream butter and sugar until light and fluffy. Add eggs, one at a time, beating well after each addition.
In another bowl, whisk flour, baking powder and salt. Add to creamed mixture, alternating with cider, beating well after each addition.
Transfer to prepared loaf pan. Bake 40-50 minutes or until a toothpick inserted into center comes out clean. Cool in pan for 10 minutes before removing to a wire rack to cool completely.
In a small bowl, mix glaze ingredients until smooth. Spoon over top of cake, allowing it to flow over the sides.