 GRAND RAPIDS, Mich., July 20, 2021 PRNewswire -- Mercantile Bank Corporation NASDAQ: MBWM Mercantile reported net income of 18.1 million, or 1.12 per diluted share, for the second quarter of 2021, compared with net income of 8.7 million, or 0.54 per diluted share, for the respective prior-year period. 