Tex. Loc. Gov't Code § 116.051
Within 15 days after the date a bank is selected as a county depository or subdepository, the bank must qualify as the depository or subdepository by providing security for the funds to be deposited by the county with the bank. The depository or subdepository may secure these funds, at the option of the commissioners court, by:
Acts 1987, 70th Leg., ch. 149, Sec. 1, eff. Sept. 1, 1987.
Amended by Acts 1989, 71st Leg., ch. 1, Sec. 15(b), eff. Aug. 28, 1989;
Acts 1991, 72nd Leg., ch. 527, Sec. 7, eff. Sept. 1, 1991.