Comerica Inc. has stolen acquisition czar Ralph W. Babb Jr. away from Mercantile Bancorp and installed him as chief financial officer at the Detroit-based bank.

Mr. Babb, who could not be reached for comment on his move, had worked for 17 years at St. Louis-based Mercantile, starting as controller and rising through the ranks to treasurer, chief financial officer, and ultimately, vice chairman. It is not clear whether he will be replaced.

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