Butterfield Bank dropped 1.6 percent (two cents) on The Bermuda Stock Exchange (BSX) yesterday.The bank traded 110,000 shares to close at $1.20.West Hamilton Holdings Ltd also saw 8,100 shares change hands, but its share price remained unchanged at $6.Overall the Index slipped 9.48 points (0.87 percent) to 1,083.97 with 118,100 shares worth $182,100 transacted.The BSX Insurance Index fell 14 points (1.43 percent) to 966.