Tex. Finance Code § 201.008

Each out-of-state state bank that has established and maintains an interstate branch in this state pursuant to this subtitle shall give written notice to the commissioner, at least 30 days before the effective date of the event, or in the case of an emergency transaction, within a shorter period consistent with applicable state or federal law, of a merger or other transaction that would cause a change of control with respect to the bank or a bank holding company that controls the bank, with the result that an application would be required to be filed with the bank's home state regulator or a federal bank supervisory agency, including an application filed pursuant to the Change in Bank Control Act of 1978 (12 U.S.C. Section 1817(j)), as amended, or the Bank Holding Company Act (12 U.S.C. Section 1841 et seq.).