Butterfield Bank’s preference shares dropped 1.6 percent ($20) on The Bermuda Stock Exchange (BSX) yesterday.The bank traded five shares to close at $1,230.It also saw 20,435 common shares change hands, but its share price held firm at $1.30.Bermuda Press (Holdings) Ltd also transacted 69 shares, however its share value remained unchanged at $11.Overall the Index opened and closed at 1,140.9 with 20,504 shares worth BD$27,321.05 and 1,043 shares worth US$16,913.62 traded.The BSX Insurance Index slipped one point (0.1 percent) to 1,010.