Key insight: A few days after the OCC approved Comerica's blockbuster sale to Fifth Third, the seller made an amended regulatory disclosure that provides more details about how the deal came together.What's at stake: The $10.9 billion deal is the largest bank acquisition announced in 2025.Forward look: The deal still needs approval from the two banks' shareholders, the Federal Reserve Board and the Texas Department of Banking.Comerica aimed high in its whirlwind negotiations to be acquired, the Dallas bank ...