Me. Rev. Stat. tit. 18, § 4163

Sections 4161, 4162, 4163‑A or this section shall not be construed to prohibit, permit or affect in any other way the right of a bank or trust company, organized and doing business under the laws of any other state, territory or district than Maine, including a national bank doing business in any other state, to establish in this State a place of business, branch office or agency for the conduct of business as a fiduciary.