A savings institution may become a member of, deal with, maintain reserves or deposits with, or make reasonable payments or contributions to, and comply with any reasonable requirements or conditions of eligibility of, any government or private organization or instrumentality to the extent that the organization or instrumentality assists in furthering or facilitating the institution’s purposes, powers, services or community responsibilities. This section shall not be construed to permit a savings institution to establish deposit or reserve accounts with any financial institution or other entity if its accounts are not insured by federal agency or other insurer approved by the Commissioner.