Butterfield Bank dropped 5.07 percent (seven cents) on The Bermuda Stock Exchange (BSX) yesterday.The bank traded 6,500 shares to close at $1.31.But BF&M Ltd rose 0.68 percent (10 cents) to $14.60 with 500 shares changing hands.Overall the Index fell 32.79 points (2.78 percent) to 1,147.12 as 7,000 shares worth $15,845 were transacted.The BSX Insurance Index also slipped six points (0.59 percent) to 1,011.