Preheat the oven to 350 degrees. Coat a large loaf pan with cooking spray.
Combine the whole wheat flour, white flour, baking powder, baking soda, and salt together in a bowl then mix well.
In a large bowl beat bananas, brown sugar, and white sugar with a beater until creamy. Add the eggs, one at a time, mixing well after each addition. Add the melted coconut oil, vanilla, and cinnamon then mix until completely combined.
Slowly add the flour mixture into the banana mixture making sure to mix well. Add the shredded coconut and stir until well combined.
For the topping, mix the remaining coconut, brown sugar, and cinnamon together until well combined in a small bowl.
Pour batter into the prepared pan then top with the topping mixture. Place into oven and bake for about 60-65 minutes, or until a tester inserted into the center comes out clean.
Remove from oven and let cool. Slice and serve plain or slathered in butter. Enjoy.