Preheat oven to 300 degrees. Prepare two loaf pans by buttering and lining with parchment paper.
Sift or whisk flour, salt, baking powder and baking soda. Add pecans if using, then set aside. In a separate bowl, cream sugar and butter. Mix in eggs, one at a time, then add the bananas. Add dry ingredients and buttermilk, alternating until incorporated. Try to end with the dry ingredient addition, and be sure not to over mix.
Bake in buttered loaf pans for one hour or until toothpick comes out clean.