Okla. Stat. tit. 18, § 381.27

Every holder of a deposit account of a mutual association and every borrower on the security of a mortgage or acquiring ownership of property upon which a mortgage is held by the association shall be deemed a member of such association. In a mutual association, a holder of a deposit account shall be entitled to one vote for each One Hundred Dollars ($100.00) of the deposit account of the holder, and a mortgagor or owner of property on which the association holds a mortgage shall be entitled to one vote at all meetings of the members. Holders of the capital stock in a stock association shall have exclusive voting rights.