Combine first 7 ingredients in a large bowl; stir in raisins. Cut bread into 1" chunks; add to egg mixture in bowl. Stir gently. Cover and chill overnight.
Pour soaked bread mixture into a lightly greased 9" springform pan. Place springform pan on a jellyroll pan.
Bake, uncovered, at 350° for 50 to 55 minutes or until a knife inserted in center comes out clean. Let cool in pan 10 minutes. Carefully remove sides of springform pan; sprinkle bread pudding with powdered sugar. Garnish, if desired. Cut into wedges, and serve warm with additional maple syrup.
Note: You can bake this in a 9" square pan or a 11" x 7" x 1 1/2" baking dish if you don't have a springform pan. Servings will be squares instead of wedges.