Butterfield Bank shares closed down 6.3 percent, or 10 cents, yesterday on the Bermuda Stock Exchange (BSX).Some 72,900 shares in the Bank traded, closing at $1.50.The day’s other mover was BF&M Ltd., which closed up 1.4 percent, or 20 cents, as 800 shares changed hands, closing at $15.The BSX ended the day down 46.45, or 3.61 percent, to finish at 1,238.63.The BSX Insurance Index was also down, falling 8.00, or 0.87 percent to close at 913.