Key insight: Fifth Third's massive credit blow tied to the allegedly-fraudulent Tricolor Holdings bankruptcy "didn't end up costing them that much," an analyst said.What's at stake: The company said last week it would acquire Comerica Bank, in what has been the largest bank deal announcement of 2025.Supporting data: The KBW Regional Banking Index fell nearly 6% on Thursday.Fifth Third Bancorp delivered mostly unsurprising financials during its third quarter, even as the bank has recently announced a major b ...