Tex. Ins. Code § 493.105
A letter of credit issued or confirmed by an institution that meets the standards prescribed by Section 493.104(b)(2)(C) as of the date the letter is issued or confirmed, but later fails to meet those standards, continues to be acceptable as security under Section 493.104 until the earliest of:
Added by Acts 2005, 79th Leg., Ch. 727 (H.B. 2017), Sec. 1, eff. April 1, 2007.