Cream together first four ingredients. Add eggs one at a time. Sift together flour, soda and salt and add alternately with milk. Mash bananas and add, then add nuts. Bake for 1-1/2 hours at 325 degrees. In a 10" stem pan that has been greased and dusted with flour. Or, bake for 1 hour 10 minutes in 2 loaf pans.