Preheat the oven to 350F. Grease and flour a 9x5-inch loaf pan.
Place oats in a small heatproof bowl. Place water in a small saucepan and bring to a boil. Pour boiling water over oats. Set aside.
Combine the flour, baking soda, salt and cinnamon in a small bowl and mix well.
Place butter in a large bowl. Beat with an electric mixer set at high speed until creamy. Add granulated sugar and brown sugar gradually, beating constantly until well blended. Add eggs, one at a time, beating well after each addition. Beat in vanilla extract.
Gradually add flour mixture to creamed mixture and beat until smooth. Stir in oats mixture. Spoon batter into prepared pan. Bake until a toothpick inserted in center of loaf comes out clean, about 1 hour.
Cool in loaf pan for 10 minutes. Transfer bread to a wire rack to cool completely.