Butterfield Bank fell 8 percent on the Bermuda Stock Exchange (BSX) yesterday.The Bank’s shares closed down 10 cents at $1.15 on a volume of 11,100.BF&M Ltd. shares also closed down, dropping 1.6 percent, or 25 cents, to finish the day at $15 on a volume of 1,700.Overall the BSX was down 4.48 percent, or 49.12, at 1,047.67.The BSX Insurance Index closed down 9, or 0.93 percent, at 958.00.