The purposes of the corporate credit union are to:
(a) accumulate and prudently manage the liquidity of its member credit unions through interlending and investment services;
(b) act as an intermediary for credit union funds between members and other corporate credit unions;
(c) obtain liquid funds from other credit union organizations, financial intermediaries, and other sources;
(d) foster and promote in cooperation with other state, regional, and national corporate credit unions and credit union organizations or associations the economic security, growth, and development of member credit unions;
(e) provide payment systems and correspondent services to its members; and
(f) perform such other services of benefit to its members which are authorized by the Board of Financial Institutions.