(a) The bank or savings association, to qualify as a municipal depository, must, not later than five days before the commencement of the term of the depository services contract, provide security for the municipal funds to be deposited in accordance with the terms of the depository services contract.
(b) Chapter 2257, Government Code governs the type, level, substitution, possession, release, and method of valuation of the security necessary to secure the deposit of municipal funds.