If a child support security deposit is ordered, the court shall order that the moneys be deposited by the child support obligor in an interest-bearing account with a state or federally chartered commercial bank, a trust company authorized to transact trust business in this state, or a savings and loan association, or in shares of a federally insured credit union doing business in this state and having a trust department, subject to withdrawal only upon authorization of the court. The moneys so deposited shall be used exclusively to guarantee the monthly payment of child support.