Butterfield Bank dropped 2.17 percent (three cents) to $1.35 on The Bermuda Stock Exchange (BSX) yesterday.The bank traded 30,000 shares during the day.Overall the Index fell 14.35 points (1.2 percent) to 1,181.11 with 30,000 shares worth BD$40,500 and 2,100 shares worth US$22,680.The BSX Insurance Index, however, climbed two points (0.19 percent) to 1,031.