Preheat oven to 350°.
Lightly spoon flour into dry measuring cups, and level with a knife. Combine the flour, baking soda, and salt, stirring with a whisk.
Place sugars and butter in a large bowl, and beat with a mixer at medium speed until well blended (about 1 minute). Add the eggs, 1 at a time, beating well after each addition. Add banana, sour cream, and cardamom; beat until blended. Add flour mixture; beat at low speed just until moist. Stir in pistachios. Spoon batter into a 9 x 5-inch loaf pan coated with cooking spray. Bake at 350° for 1 hour or until a wooden pick inserted in center comes out clean. Cool 10 minutes in pan on a wire rack; remove from pan. Cool bread completely on wire rack.