A. The capital of mutual associations may be divided into such classes of shares or savings accounts as is prescribed by the board of directors and may be issued in such full or fractional denominations and subject to such additional rules and regulations as the board of directors of each association may from time to time make and authorize. These shares or savings accounts may be paid for in periodical installments, in cash or in liquidation of matured shares. Such shares or savings accounts shall be payable in the manner designated for each particular class. A member may exchange the value of any such shares or savings accounts owned for any class desired with the assent of the board of directors.
B. A capital stock association may issue capital stock and other capital securities as approved by the commissioner.