Preheat the oven to 325 °F. Grease a 9x5 inch loaf pan and set aside.
Whisk together the flour, salt, baking soda and spices in a bowl.
In a mixing bowl, beat together the butter and sugars until smooth. Beat in the eggs, one at a time until fully incorporated. Stir in the bananas and vanilla until mixed in,
Stir in the raisins.
Slowly mix in the dry ingredients until incorporated, mixing on the lowest speed.
Bake for 60 to 70 minutes in the preheated oven, until a toothpick inserted into the middle of the loaf comes out clean.
Cool the loaf in the pan for 10 minutes, the remove from the pan and let cool completely on a wire baking rack.
Store at room temperature in a closed container or bag for 2-3 days.
Notes
You can add a few more raisins if you want! Bake it low and slow and it won't dry out!