Shares of Butterfield Bank were down $1.75, or 5.9 per cent, at $28 after 1,100 traded on The Royal Gazette/BSX Index.In New York, the bank’s shares were down $1.52, or 5.23 per cent, at $27.54.The Royal Gazette/BSX Index was down 78.71 points, or 3.87 per cent, at 1,953.4, while the BSX Insurance Index was down 39.87 points, or 2.34 per cent, at 1,665.66.