Preheat oven to 350° F. Spray a 9 x 5-inch loaf pan with cooking spray; flour the pan and set aside.
Lightly spoon flours into dry measuring cups; level with a knife, then add to a large bowl.
Add baking soda and salt to the flour, then whisk to combine.
Place sugar and oil into a separate mixing bowl; beat with a mixer at medium speed until well blended.
Add eggs 1 at a time to the sugar mixture, beating well after each addition.
Peel bananas and mash with the back of a fork.
Add mashed banana, yogurt, lime juice, and vanilla to the mixing bowl and beat again until well blended.
Add flour mixture to the mixing bowl; beat at low speed just until moistened. Fold in 1/2 cup coconut.
Spoon batter into the prepared pan, and sprinkle extra coconut on top. Using the back of a spoon, gently press without mixing in.
Bake for up to 1 hour, checking at 45 minutes. A toothpick inserted into the center should come out clean when done.
Remove from oven and allow to cool for 10 minutes in the pan, then transfer to a wire rack to finish cooling.