Texas Health and Safety Code - HEALTH & SAFETY § 287.130. Depository

(a) The board shall name at least one bank to serve as depository for district funds.

(b) District funds, other than those invested as provided by Section 287.129(b) and those transmitted to a bank of payment for bonds or obligations issued or assumed by the district, shall be deposited as received with the depository bank and must remain on deposit. This subsection does not limit the power of the board to place a portion of district funds on time deposit or to purchase certificates of deposit.

(c) Before the district deposits funds in a bank in an amount that exceeds the maximum amount secured by the Federal Deposit Insurance Corporation, the bank must execute a bond or other security in an amount sufficient to secure from loss the district funds that exceed the amount secured by the Federal Deposit Insurance Corporation.