Butterfield Bank announced that it will introduce a share buyback programme, that will enable Butterfield to repurchase up to six million common shares and 2,000 preference shares at market prices on the stock exchanges on which Butterfield shares are listed.The news comes on the heels of the bank posting a $14.7 million profit in the first three months of this year, a 75 percent increase over the same period last year.The January through March period was the bank’s fifth successive profitable quarter and the $6.3 million improvement over the prior-year period’s net income was driven by a $4.5 million increase in net interest income, as the bank achieved higher yields on its investments.