The Royal Gazette/BSX Index closed unchanged on 1,788.64 as no shares traded on the Bermuda Stock Exchange.The US-listed shares of Butterfield Bank fell 99 cents, or 4.03 per cent, to close on $23.56 on the New York Stock Exchange as 207,915 shares changed hands.Butterfield last traded at $24.05 on the BSX.The BSX Insurance Index fell 7.59 points, or 0.56 per cent, to close on 1,375.01.