Tex. Finance Code § 182.017

(a) If the banking commissioner determines from examination or other credible evidence that an exempt state trust company has violated any of the requirements of this subchapter relating to an exempt state trust company, the banking commissioner may by personal delivery or registered or certified mail, return receipt requested, notify the state trust company in writing that the state trust company's exemption has been revoked. The notice must state grounds for the revocation with reasonable certainty. The notice must state its effective date, which may not be earlier than the fifth day after the date the notification is mailed or delivered.

(b) The revocation takes effect for the state trust company if the state trust company does not request a hearing in writing before the effective date. After taking effect the revocation is final and nonappealable as to that state trust company, and the state trust company is subject to all of the requirements and provisions of this subtitle applicable to nonexempt state trust companies.