Mercantile Bank Corp. in Grand Rapids, Mich., announced several promotions that underscore a heightened focus on loan growth.

The $3 billion-asset company said in a press release Thursday that it will promote Mark Augustyn, its regional commercial loan manager, to become west region president and senior lender. He will succeed Ray Retism, who will become president of the company's Mercantile Bank of Michigan.

Jeff Kaiser will move from loan administrative manager to head of the risk management department. Kaiser will succeed Robert Worthington, who was named chief operating officer in January.

Doug Holtrop and Justin Karl, senior vice presidents in the commercial loan department, were named commercial loan managers.

All the promotions will take effect on Jan. 1.

The moves are part of an ongoing management succession plan that began in July when Mercantile said that Robert Kaminski, its chief operating officer, would succeed Michael Price as president and chief executive at the end of this year.

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