Butterfield Bank’s preference shares inched lower in Bermuda Stock Exchange trading yesterday.The shares fell $5, or 0.4 percent, to close on $1,230, as eight shares changed hands.Butterfield’s common shares also traded, but remained unchanged on $1.10 after 6,000 shares traded.Bermuda Commercial Bank Ltd was also unchanged on $11 after 100 shares were exchanged.The Royal Gazette / BSX Index closed unchanged on 1,043.57.Trading volume was 6,108 shares and turnover totalled more than $17,000.