Any bank or banking institution, principally engaged in foreign business, incorporated by special law of any State or of the United States or organized under the general laws of any State or of the United States and having an unimpaired capital sufficient to entitle it to become a corporation under the provisions of this subchapter may, by the vote of the shareholders owning not less than two-thirds of the capital stock of such bank or banking association, with the approval of the Board of Governors of the Federal Reserve System, be converted into a Federal corporation of the kind authorized by this subchapter with any name approved by the Board of Governors of the Federal Reserve System: Provided, however, That said conversion shall not be in contravention of the State law. In such case the articles of association and organization certificate may be executed by a majority of the directors of the bank or banking institution, and the certificate shall declare that the owners of at least two-thirds of the capital stock have authorized the directors to make such certificate and to change or convert the bank or banking institution into a Federal corporation. A majority of the directors, after executing the articles of association and the organization certificate, shall have power to execute all other papers and to do whatever may be required to make its organization perfect and complete as a Federal corporation. The shares of any such corporation may continue to be for the same amount each as they were before the conversion, and the directors may continue to be directors of the corporation until others are elected or appointed in accordance with the provisions of this subchapter. When the Board of Governors of the Federal Reserve System has given to such corporation a certificate that the provisions of this subchapter have been complied with, such corporation and all its stockholders, officers, and employees shall have the same powers and privileges, and shall be subject to the same duties, liabilities, and regulations, in all respects, as shall have been prescribed by this subchapter for corporations originally organized thereunder.