Capital stock shall constitute a secondary reserve out of which losses shall be paid after all other available reserves have been exhausted and shall have a par value of one dollar each or such greater amount as the articles of incorporation may prescribe. These shares shall be:
(1) Nonwithdrawable, except as provided in this Part relative to retirement or reduction of capital stock, until all liabilities of the savings bank have been satisfied in full, including payment of the withdrawal value of all deposit accounts;
(2) Entitled to dividends only as provided in this Part concerning dividends; and
(3) Issued only upon cash payment of not less than the par value thereof, or in connection with a merger, sale of all assets, or conversion, or as stock dividends as provided in the provisions of this Part relative to dividends.