Butterfield Bank dropped 3.57 percent (five cents) on The Bermuda Stock Exchange (BSX) yesterday.The bank traded 30,900 shares to close at $1.35.The Ascendant Group Ltd also saw 25 shares change hands, but its share price held firm at $14.89.Overall the Index fell 23.92 points (1.99 percent) to 1,180.28 with 30,925 shares worth $42,090 transacted.The BSX Insurance Index rose two points (0.21 percent) to 964.