 GRAND RAPIDS, Mich., Oct. 19, 2021 PRNewswire -- Mercantile Bank Corporation NASDAQ: MBWM Mercantile reported net income of 15.1 million, or 0.95 per diluted share, for the third quarter of 2021, up 40.8 percent from 10.7 million, or 0.66 per diluted share, for the respective prior-year period. 