Section 55A. A city, town, district or regional school district officer receiving public money and lawfully and in good faith and in the exercise of due care depositing the public money in a trust company, co-operative bank or savings bank, if the trust company or bank is organized or exists under the laws of the commonwealth or any other state or may transact business in the commonwealth and has its main office or a branch office in the commonwealth, a national bank, federal savings bank or federal savings and loan association, if the bank or association may transact business and has its main office or branch office in the commonwealth or in participation units in a combined investment fund under section 38A of chapter 29 or, in the city of Boston, in accordance with section 55 in a national bank or trust company in the city of New York; provided, however, that a state-chartered or federally-chartered bank shall be insured by the Federal Deposit Insurance Corporation or its successor, shall not be personally liable to the city, town, district or regional school district for any loss of public money by reason of the closing or liquidation of any depository institution described in this section.