Okla. Stat. tit. 18 § 381.60
At an annual meeting or at any special meeting of the members or stockholders called to consider such action, any federal association may convert itself into an association under this act upon a majority vote of the outstanding stock entitled to vote thereon or upon a majority vote of the total number of votes of the members of such federal association eligible to be cast. Copies of the minutes of the proceedings of such meetings of members or stockholders, verified by the affidavit of the secretary or an assistant secretary, and verified copies of the plan of conversion shall be filed for approval with the State Banking Commissioner. At the meeting at which conversion is voted upon, the members or stockholders shall also vote upon the directors who shall be the directors of the state-chartered association after conversion takes effect. Such directors then shall execute and file a certificate of incorporation and proposed bylaws, and the Commissioner shall file a certificate of authority upon approval by the Commissioner, all as provided in this act. The association shall include in the certificate of incorporation, the following: "This association is incorporated by conversion from a federal association." All of the directors who are chosen for the association shall sign and acknowledge the certificate of incorporation as the subscribers. The Commissioner may provide, by regulation, for any additional procedure to be followed, and application fee to be paid, by any such federal association converting into an association under this act. All the provisions regarding property and other rights and liabilities contained in Section 381.59 of this title shall apply, in reverse order, to the conversion of a federal association into an association incorporated under this act, so that the state-chartered association shall be a continuation of the corporate entity of the converting federal association.
Okla. Stat. tit. 18, § 381.60