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Our Yarmouth branch will close at noon on Friday 7/19 and remain closed on Saturday 7/20 for the Yarmouth Clam Festival. The drive-up video teller is available normal hours. We apologize for the inconvenience. See nearby locations.


Michael Voisine

VP, Commercial Banker

Commercial Banking Office
63 Marginal Way, Portland, ME
(207) 221-8441

Mike has been with GSB since 2004 in roles of increasing responsibility in our commercial banking department. Mike’s passion is building strong, interpersonal connections with businesses which benefit the whole Southern Maine community. To Mike, Banking Is Believing represents GSB’s efforts to develop proactive, meaningful relationships with our customers.

Mike holds a Bachelor’s in Business Administration and Financial Accounting from the University of Maine at Augusta. He’s very active in the community and serves on committees for the Boys and Girls Clubs of Southern Maine, Seventy-Five State Street, Avesta Housing, United Way of Greater Portland, and the Maine Marathon.