Preheat oven to 350F.
Beat butter and sugar, Add, eggs, bananas and buttermilk. Add flour and baking soda. Mix well after each addition.. Spoon batter evenly into four greased 9-inch baking pans. Bake 30 minutes. Cool completely before icing cake.
Soften butter and cream cheese. Mix well with electric blender. Add vanilla. Gradually add powdered sugar. Use first as filling between layers. Add sliced bananas between cake layers. Add pecans to remaining icing and ice cake. Refrigerate to make cutting and serving easier. Makes one very tall cake.
Cajun Country -- New Iberia, Louisiana