The city manager and every officer, agent, and employee having duties embracing the receipt, disbursement, custody, or handling of money shall, before entering upon these duties, execute a fidelity bond with some surety company authorized to do business in the state, as surety, except that bonds for five hundred dollars ($500) or less may be given with personal surety, in such amount as shall be prescribed by ordinance of the board of commissioners, except where the amount is prescribed in this charter. All such bonds and sureties thereto shall be subject to the approval of the board of commissioners. The cost of making these bonds is to be paid by the city.