It was founded in Somerville, Massachusetts in 1969 by Marshall M. Sloane and at one point became the state's largest family-run bank.

[3] On May 1, 1969, Century Bank and Trust Company officially opened its doors in a temporary trailer parked on the M.D.C.'s sidewalk at 102 Fellsway West in Somerville.

By November 21, 1968, he and 20 other businessmen were granted a charter to establish the Century Bank & Trust Company.

Opening day in the trailer saw President Marshall M. Sloane and seven employees realize the fruits of their labor.

[citation needed] Century Bank was acknowledged annually in the Boston Globe 100 as one of the top performing publicly traded companies in Massachusetts.