GRAND RAPIDS, Mich. (AP) — GRAND RAPIDS, Mich. (AP) — Mercantile Bank Corp. (MBWM) on Tuesday reported third-quarter earnings of $24.1 million. The Grand Rapids, Michigan-based bank said it had earnings of $1.39 per share. Earnings, adjusted for costs related to mergers and acquisitions, came to $1.42 per share. The results surpassed Wall Street expectations....