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Preheat oven to 350 degrees F. Liberally grease the sides of a 9 x 5 x 3-inch loaf pan and set aside.
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In a medium bowl, combine flours, 3/4 cup sugar, baking soda, cinnamon, and sea salt. Fold in chocolate wafers.
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In a large bowl, stir to combine olive oil, yogurt, orange zest, eggs, and vanilla. Fold in mashed bananas.
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Fold flour mixture into wet ingredients, stirring just until flour is mixed in.
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Spoon batter into prepared baking dish, sprinkle top with remaining 2 tablespoons sugar, and slide into oven. Bake 50 - 60 minutes, or until a toothpick comes out with just a few crumbs attached and the top is golden brown. Keep a close eye toward the end of cook time so as not to over bake.
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Cool 20 minutes, release from baking dish and cool completely or eat right away. Tightly covered, banana bread will keep several days at room temperature.