Societies, and copartnerships composed primarily of individuals who are eligible to membership, and corporations whose stockholders are composed primarily of such individuals, may be admitted to membership in the same manner and under the same conditions as individuals, but may not borrow in excess of their shareholdings. Provided, however, secured loans in excess of shareholdings may be made to nonprofit societies, copartnerships, and  corporations who are members. (1975, c. 538, s. 1; 1979, c. 809, s. 1.)