About Us

Who is Partners Bank?

Partners Bank, formerly SIS Bank, is a mutual savings bank founded in 1933. We are headquartered in Sanford, Maine, with additional branch locations in Springvale, South Sanford, Limerick, Buxton, Waterboro, Wells and York, Maine and in Portsmouth, Rye, and Kingston New Hampshire. We are a full-service bank committed to providing excellent service to individuals, families and small as well as large businesses.

What sets us apart is our willingness to listen to customers’ needs and our ability to make timely, local decisions to meet those needs.

Partners Bank offers state-of-the-art, 24/7 account access with phone banking, ATM access, mobile and online banking with mobile check deposit and mobile wallet options.


We are a Mutual Bank

As a mutual bank, we are independent and exist for the sole benefit of our customers and the communities we serve. We are not governed by shareholders or the demands of stock prices or dividends.