Carla Rasetta, president and CEO of Lowell-based Mills42 Federal Credit Union, will resign from her role in early December after 17 years with the credit union.

Rasetta said in a statement that she was leaving Mills42 effective Dec. 4 to join her family’s business.

“Over these 17 years, the last 10 as CEO, I have built the most beautiful professional relationships with our members,” Rasetta said. “This truly has been my reason for working so hard. Nothing is more gratifying to me than to see our members receive the best possible care and attention. And, nothing is more rewarding than to ensure you are well on your way to establishing smart banking habits and fulfilling mid- and long-term financial goals.”

The new CEO will be introduced in the next few weeks, Rasetta said, adding that the board of directors had identified “an experienced, talented, enthusiastic credit union professional.” Following her resignation, Rasetta will join Mills42’s board of directors.

Mills42 has one branch in Lowell and about $26 million in assets. It was once the credit union for M/A-COM Technology Solutions before changing its charter 15 years ago and its name in 2013. Membership groups now include those who live, work, worship or attend school in Lowell, the northern portion of Chelmsford and western portion of Tewksbury. The credit union’s name refers to Lowell’s heritage as a mill city and the line of latitude where Lowell is found on a map.

“More than anyone could ever imagine, Mills42 has captured my heart,” Rasetta said. “I love my team, our members and our fantastic volunteer board of directors. And words cannot express how much I will miss it.”