Okla. Stat. tit. 18 § 381.3
The certificate of incorporation and certificate of authority to transact business as an association, of every association heretofore organized under the laws of this state and existing as of January 1, 2000, shall continue in full force and effect, and the same shall be deemed as modified to conform with this act without the adoption of a new certificate of incorporation or issuance of a new certificate of authority. The contracts, obligations and liabilities of every such association, and the contracts, notes, mortgages, investments and other assets and rights of every kind and nature held by it, as well as its bylaws and resolutions, shall continue in full force and effect. Every such association and every association hereafter incorporated shall have perpetual existence, subject to merger, conversion or liquidation pursuant to the provisions of this act.
Okla. Stat. tit. 18, § 381.3