Cambridge Bancorp President and CEO Joseph V. Roller II has announced plans to retire by mid-2015.

Roller has been with Cambridge Bancorp and its subsidiary, Cambridge Trust Co., since 2001 when he joined as president and chief operating officer. He became CEO in 2003.

Since 2001, the bank’s total assets have more than doubled to $1.5 billion as of March 31. Total loans have increased from $221 million to $947 million and total deposits from $494 million to $1.3 billion during that period. Wealth management client assets under management have enjoyed significant growth from $1.2 billion in 2001 to $2.2 billion today.

"On behalf of the entire board, I congratulate Joe on his prospective retirement next year after a distinguished 40-year career in the financial services industry and his outstanding stewardship of the company for the past 13 years. Our challenge now is to find a worthy successor, a president and CEO who can maintain the momentum and sustain the same impressive results that have been the hallmark of Joe’s leadership," Cambridge Bancorp Lead Director Linda Whitlock said in a statement.

During Roller’s tenure, the bank expanded its geographic reach to a retail network of 12 branches and recently completed a total renovation of its headquarters in Harvard Square. The bank also established an Innovation Banking Group in Kendall Square and relocated the Wealth Management Group to 75 State St. in Boston’s Financial District.

The executive committee of the board plans to establish a search committee of board directors to oversee the process to replace Roller next year.

"I have been honored and fortunate to serve Cambridge Trust Company," Roller said in a statement. "The legacy I hope to leave is one that fosters what makes this organization special – true community partnerships and a place where employees want to come to work every day."