The term depository institution means any of the following:
(a) An insured bank as defined in section 3 of the Federal Deposit Insurance Act;
(b) An insured institution as defined in section 408(a) of the National Housing Act;
(c) An insured credit union as defined in section 101 of the Federal Credit Union Act; or
(d) Any other institution that is carrying on banking activities pursuant to a charter from a Federal or state banking authority. [57 FR 53997, Nov. 16, 1992]