Butterfield Bank closed unchanged at $1.13 yesterday on the Bermuda Stock Exchange, as 29,000 shares changed hands.Under utilities, Ascendant Group and KeyTech Ltd also traded, both closing unchanged.Ascendant closed at $13.50 as 100 shares changed hands, and KeyTech closed down 55 cents at $5.45 as 200 shares were exchanged.The BSX overall closed at 1,026.82, down 6.81 or 0.66 percent.