Enterprise Bancorp Inc. announced unaudited consolidated earnings results for the fourth quarter and year ended December 31, 2011. Net income for the three months ended December 31, 2011 amounted to $2.9 million, or $0.30 per diluted share, compared to $2.4 million, or $0.26 per diluted share, for the comparable 2010 period, increases of $436,000 or 18%, and $0.04, or 15% per diluted share. Net interest income for the quarter ended December 31, 2011 amounted to $15.3 million, an increase of $1.3 million, or 9%, compared to $14.035 million of the December 2010 quarter. Income before income taxes was $4.147 million versus $3.470 million of previous year period. The company announced net income of $10.9 million, or $1.16 per diluted share, for the year ended December 31, 2011, compared to $10.6 million, or $1.15 per diluted share, for the year ended December 31, 2010, increases of $304,000 or 3%, and $0.01, or 1% per diluted share. The company's growth contributed to increases in net interest income and the level of operating expenses in both the quarter and year ended December 31, 2011. Additionally, the 2011 year-end results were positively impacted by increases in non-interest revenue. Net interest income increased $3.4 million, or 6%, for the year ended December 31, 2011 and amounted to $58.3 million from $54.971 million. The increases in net interest income over the comparable 2010 periods were due primarily to loan growth. Income before income taxes was $16.105 million versus $15.714 million of previous year. Return on average total assets and return on average stockholders' equity were 0.75% and 8.98% against 0.78% and 9.42% respectively of prior year. Book value per share at year end was $13.45 versus $12.56 of previous year.