Texas Local Government Code - LOC GOV'T § 131.901. Out-of-State Depository Prohibited

(a) The governing body of a political subdivision, including a county, municipality, school district, or other district, may not designate a financial institution located outside the state as a depository for funds under the governing body's jurisdiction. An out-of-state financial institution is not considered to be located outside this state to the extent the governing body designates a branch office of such institution that is located in this state.

(b) An institution selected as a paying agent or trustee for specific bonds or obligations or an institution selected by the governing body to provide safekeeping services is not considered a depository for purposes of this section.