Pulse bread in food processor 6 times or until coarsely crumbled.
Whisk together mayonnaise and next 9 ingredients in a large bowl; gently fold in breadcrumbs and crabmeat (being careful not to break up crab). Shape mixture into 6 patties; place on a baking sheet. Cover and chill at least 1 hour.
Cook crab cakes, in batches, in hot oil in a medium skillet over medium-high heat 3 to 4 minutes on each side or until golden.