Except as otherwise expressly provided in the terms for any class of shares issued by a stock state bank, every holder of the bank’s voting shares, in elections of directors and in deciding other questions at meetings of shareholders, is entitled to one vote for each share held and shall not accumulate the votes unless otherwise provided in the articles of incorporation. Any shareholder eligible to vote may vote by proxy authorized in writing. An appointment of a proxy shall expire in accordance with division (C) of section 1701.48 of the Revised Code. Unless the articles of incorporation, the code of regulations, or the contract of subscription otherwise provides, a subscriber for authorized shares is a shareholder for the purposes of this section, but no shares upon which an installment of the purchase price is overdue and unpaid shall be voted.