Chelsea-based Metro Credit Union, which announced late last month that it would merge with the Massachusetts State Employees Credit Union, is about to become more visible.

Metro said in a statement today that it has kicked off a new brand campaign touting itself as "banking’s best kept secret."

The campaign includes radio and print advertising, features customers "admitting" that they keep the benefits of membership a secret.

"Between the expansion of our footprint geographically the last few years, and the continuing backlash against big banks for high fees and poor service, the time was right to step up our outreach and welcome more members," Robert M. Casham, Metro’s president and CEO, said in a statement.