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Preheat oven to 350 degrees F (175 degrees C).
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Grease one 9x5 inch loaf pan.
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In a small saucepan, combine the raisins and the rum.
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Cook over medium heat until simmering, then remove from the heat and allow to cool 10 minutes.
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In a large bowl, mix together the mashed bananas, brown sugar, canola oil, and eggs with an electric mixer for 1 minute.
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Sift together the all-purpose flour, whole wheat flour, baking powder, baking soda, salt, and ground cardamom; stir into the egg mixture with a spoon until well blended.
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Stir in the walnuts and the rum soaked raisins last.
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Pour the batter into the prepared pan.
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Bake in the preheated oven for 50 to 60 minutes, or until a toothpick inserted comes out clean.
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Allow bread to cool slightly before removing from the pan.