Me. Rev. Stat. tit. 30-A, § 6011

Notwithstanding any restrictions contained in any other law, the State and all public officers, governmental units and agencies of the State, all national banking associations, state banks, trust companies, savings banks and institutions, building and loan associations, savings and loan associations, investment companies and other persons carrying on a banking business, all insurance companies, insurance associations and other persons carrying on an insurance business, and all executors, administrators, guardians, trustees and other fiduciaries, may legally invest any sinking funds, money or other funds belonging to them or within their control in any bonds or notes issued by the bank under this chapter. These bonds or notes are authorized security for any and all public deposits.