Butterfield Bank endured a mixed day yesterday, with its common shares rising four percent (five cents) and its preference shares dropping 5.49 percent to $70 on The Bermuda Stock Exchange (BSX).The bank traded 10,400 common shares to close at $1.30, and 221 preference shares to end the day on $205.Bermuda Commercial Bank Ltd., meanwhile, transacted 20 shares, but its share price held firm at $9.85.Overall the Index climbed 23.92 points (2.09 percent) to 1,166.41, as 10,420 shares worth BD$13,072.10 and 221 shares worth US$268,671.45were transacted.The BSX Insurance Index, however, fell two points (0.19 percent) to 1,030.