Butterfield Bank shares had a topsy-turvy week on the Bermuda Stock Exchange (BSX), sinking below a dollar on Tuesday, but rebounding to finish the week higher.During the trading week, which was shortened to four days by the BSX’s closure for the Good Friday holiday, Butterfield shares climbed three cents, or 2.8 percent, on the trading of 113,643 shares.Butterfield’s preferred shares also saw some busy trading, falling $5, or 0.4 percent, to close the week on $1,225, as 538 of the shares changed hands.Elsewhere, trading was thin among domestic-board companies. BF&M Ltd, which last week announced its intended $68 million acquisition of Cayman-based insurer Island Heritage, remained on $15, as 438 of its shares traded.Ascendant Group Ltd was also unchanged on $13.30, as 167 shares were exchanged.The Royal Gazette / BSX Index closed on Thursday at 1,018.02, up 14.22 points, or 1.39 percent, for the week.The volume of shares traded was 114,786, while turnover was just shy of $788,000.