Nothing in the law of this state shall restrict the right of a stock association to merge with and into a national banking association. The action to be taken by a constituent stock association and its rights and liabilities and those of its stockholders shall be the same as those prescribed for national banking associations at the time of the action by the applicable laws of the United States and not by the laws of this state. Upon the completion of the merger with and into a national banking association, the certificate of authority and the certificate of incorporation of any merging stock association shall automatically terminate.