Mark O’Connell, the long-time leader of Hudson-based Avidia Bank, plans to retire next year after 35 years at the bank.

O’Connell plans to retire in May 2023, the bank said in a statement. Avidia’s board of directors has started an executive search for his successor, the statement said.

O’Connell is currently vice chairman of the Massachusetts Bankers Association and will begin a one-year term as chairman on July 1.

A certified public accountant, O’Connell joined Hudson Savings Bank in 1988 as controller and later became treasurer and chief financial officer, the statement said. He was appointed president and CEO in 2004.

O’Connell oversaw the 2007 merger between Hudson Savings Bank and Westborough Savings Bank, a transaction that created Avidia Bank. During O’Connell’s tenure at Avidia and Hudson Savings Bank, the bank grew from $120 million in assets with two branches to a $2.3 billion-asset financial institution with nine branches, according to the statement.

“I’m really proud of what we’ve all been able to accomplish at Avidia over the years,” O’Connell said in the statement. “It’s not just in our growth, but how we’ve been able to continue to be good citizens to help all members of our communities.”

A board member of the Depositors Insurance Fund, O’Connell is past chairman of the United Way of Tri-County and the Boys & Girls Club of Metrowest. He also helped create the Avidia Bank Charitable Foundation, which has provided more than $4.5 million in donations since its inception in 1997, the statement said.

“The Board is so grateful for Mark’s leadership, vision, and commitment over the years, which has made Avidia the strong financial institution we are today,” the board said in the statement. “We look forward to building on the foundation of success he helped build.”