Butterfield Bank tumbled 9 cents (7.20 percent) on the Bermuda Stock Exchange yesterday, to close at $1.16 with 3,649 shares trading hands. Butterfield Preferred traded 70 shares to close at $1,235 with no change in share price.Overall, the BSX closed 1043.90, down 42.65 points (3.93 percent), trading 3,649 shares worth BD$4237.25 and 70 US shares worth US$87,725.56.