California Code, Financial Code - FIN § 5604

(a) In the case of a stock association, on or after the date the commissioner issues the association a certificate of authority, the association shall issue the capital stock necessary to satisfy the minimum capital requirements of Section 5601 and any additional capital stock approved for issuance by its board of directors, up to the amount authorized in its articles of incorporation, and shall issue no additional shares except as authorized in this division.

(b) The capital stock of an association, when issued, shall constitute permanent capital and shall not be retired or withdrawn except as provided in this division until all liabilities of the association have been satisfied in full, including the withdrawal value of all savings accounts, and until outstanding capital certificates have been retired.