Butterfield Bank dropped 5 cents (4.34 percent) on the Bermuda Stock Exchange yesterday, with 23,100 shares trading to close at $1.10. BF&M also dropped 25 cents (1.61 percent) with 1,500 shares trading to close at $15.25.Overall, the BSX closed at 1015.75, down 25.42 points (2.44 percent) with 24,600 shares trading worth $48,285.