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Butter a 9x5x3-inch pan.
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Preheat oven to 350 degrees F (175 degrees C).
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Cream butter, add sugar slowly, and continue to beat until light and lemon-colored.
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Beat in eggs.
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Sift flour with salt, baking soda, and baking powder.
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Add to the butter mixture alternately with the buttermilk, beginning and ending with the dry ingredients.
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Stir in the apples, nuts, and vanilla.
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Spoon batter into prepared pan.
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Bake in a preheated 350 degree F (175 degrees C) oven for 50-60 minutes, until the loaf pulls away slightly from the sides of the pan or until a cake tester comes out clean.
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Cool in the pan for about 5 minutes, then loosen from pan and turn onto a rack to cool completely before slicing.