Shares of Butterfield Bank gained 6.3 per cent in Bermuda Stock Exchange trading.Butterfield gained $1.40 to close on $23.50 on the trading of 300 shares. The bank’s US-listed shares also climbed sharply on the New York Stock Exchange, jumping $1.03, or 4.39 per cent to close on $24.50 as 157,505 shares changed hands.Two stocks besides Butterfield gained ground as The Royal Gazette/BSX Index climbed 61.71 points, or 3.63 per cent, to close on 1,759.85.Argus Group Holdings added six c