Standard & Poor’s has graded Medford-based Century Bank with an A quality ranking.

“Our dedication to our community, our customers and our shareholders is unwavering,” Founder and Chairman Marshall M. Sloane said in a statement. “I founded Century with a strategy that has built solid financial performance and positions us for growth well into the future.”

Century Bank is the only Massachusetts-based bank to earn this distinction.

“This ranking signifies that Century Bank is one of the best financially ranked regional banks in the state,” President and CEO Barry R. Sloane said. “The ranking reflects great confidence in Century’s general and fiscal management and its leadership. This independent, third-party acknowledgement is an honor and validation that the Bank is on the right trajectory for future growth.”