Shares of Butterfield Bank fell 90 cents, or 3.5 per cent, to $25.10, after 2,170 traded on The Royal Gazette/BSX Index.In New York, the bank’s shares were down 27 cents, or 1.04 per cent, at $25.66.On the local exchange, there was also trading in 1,500 shares of Bermuda Aviation Services Ltd, but with no change to the closing price of $1.10.The Royal Gazette/BSX Index was down 40.48 points, or 2.16 per cent, at 1,830.04, while the BSX Insurance Index was down 19.21 points, or 1.34 per cent, at 1,410.9.