A. The board of directors, when authorized by the bylaws and in conformity with the provisions of this Part and of the bylaws, may retire any withdrawable accounts which have not been pledged as security for loans by enforcing the retirement thereof.
B. A thirty-day notice of such enforced retirement shall be given to the holder of an account to be retired, and after the expiration of such thirty-day period, the holder shall not be entitled to further interest but shall be paid the full withdrawal value of his account, plus such additional interest as the board of directors may determine to be equitable and within the bearing rate of the savings bank, less any unpaid charges.