Butterfield Bank jumped 8 cents, or 5.7 percent, to close at $1.48 on the Bermuda Stock Exchange yesterday.Some 37,000 of the bank’s shares changed hands.Argus Group shares declined 19 cents, or 5.1 percent, to close at $3.51.KeyTech closed unchanged at $5.80 as 25,000 shares changed hands.Overall the BSX closed up 34.35, aor nearly 3 percent, at 1,185.61