FirstMerit Corp. named William G. Lamb, the Elyria, Ohio, president of its FirstMerit Bank, to the newly created post of chief executive officer for that market as well.

Mr. Lamb's duties expanded May 22 when FirstMerit Corp. bought Elyria- based Cobancorp, the $666 million-asset parent of PremierBank and Trust and of Jefferson Savings Bank in West Jefferson, Ohio.

PremierBank will be integrated into FirstMerit in September, and Jefferson Bank in October.

FirstMerit Corp., based in Akron, Ohio, has $6.1 billion of assets.

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