(a) Any stockholder or group of stockholders of a state banking institution, holding of record the number of voting shares of such bank specified below, upon making written demand stating a proper purpose, shall have the right to examine, in person or by agent or attorney, at any reasonable time or times, nonconfidential portions of its books and records of account, minutes and record of stockholders and to make extracts therefrom. Such right of examination is limited to a stockholder or group of stockholders holding of record:
(1) Voting shares having a cost of not less than $100,000 or constituting not less than one percent of the total outstanding voting shares: Provided, That such stockholder or group of stockholders have held of record such voting shares for a period of at least six months before making such written demand; or