Preheat oven to 350ºF. Grease a two 9x5-inch loaf pan, set aside.
Pour baking soda into buttermilk. Set aside.
In the bowl of an electric mixer, mix together butter and sugar until light and fluffy. Add eggs, mixing well. Add flour and salt. Add buttermilk mixture and beat. Mix in bananas and pecans. Pour into prepared pan.
Bake for 55 minutes if making two loaves. Bake 1 hour if only using 1 loaf pan.
