Grandma Tate's Banana Bread

1/2 c. margarine
1 c. sugar
2 c. plain flour
2 eggs
1/2 tsp. salt
3 mashed bananas
4 tbsp. buttermilk
1 tsp. vanilla flavoring
1 c. chopped nuts
1 tsp. baking soda

Heat oven to 350 degrees. Cream margarine and sugar until light. Add eggs and beat well. Dissolve soda in buttermilk and add to mashed bananas and then to above mixture. Add other ingredients and mix well. Bake in loaf pan lined with wax paper for about 45 minutes.