As used in this chapter, the following words shall, unless the context clearly requires otherwise, have the following meanings:-
"Bank", a savings bank, co-operative bank or trust company incorporated as such in the commonwealth.
"Board", the board of trustees or directors of a bank.
"Commissioner", the commissioner of banks.
"Federally-chartered bank", a national bank association, a federal savings and loan association, a federal savings bank or a federal credit union authorized to do business in the commonwealth.
Mass. Gen. Laws ch. 167D, § 1