Tex. Fin. Code § 187.104
An out-of-state trust company desiring to establish and maintain a de novo trust office or acquire an existing trust institution in this state and to operate and maintain the acquired institution as a trust office pursuant to this subchapter shall provide written notice of the proposed transaction to the banking commissioner on or after the date on which the out-of-state trust company applies to the home state regulator for approval to establish and maintain or acquire the trust office. The filing of the notice shall be preceded or accompanied by a copy of the resolution adopted by the board authorizing the additional office and the filing fee, if any, prescribed by law. The written notice must contain sufficient information to enable an informed decision under Section 187.105.
Tex. Fin. Code § 187.104