About midway between Boston and Worcester in eastern Massachusetts is where you'll find the branch network of Middlesex Savings Bank. Boasting more than $4 billion in assets, the mutually owned, community-oriented financial institution provides such traditional products and services as checking and savings accounts, IRAs, and certificates of deposit. Its lending activities are focused on residential and commercial mortgages; the bank also has four offices devoted to business lending, including Small Business Administration loans. Its Middlesex Financial Group subsidiary provides retail investment services.