Banks are governed by boards of directors elected by the stockholders. By law, the directors are primarily responsible for the administration of the bank. Bank officers are chosen by the directors and are charged with the duties and responsibilities of active administration. The size of the bank, its location and the amount of business done determine the number of officers, although in every bank there are at least two, namely, a president and a cashier. In larger banks there is also a vice-president and, sometimes, an assistant cashier. In the great city banks there are frequently two or more vice-presidents and assistant cashiers. In the administration of the affairs of any bank the duties and responsibilities of every officer and employee should be well defined. Responsibility is commensurate with authority, and officers and employees should be held to strict accountability for the satisfactory performance of their own specific duties - no more, no less. Those who do more than their duty are in a class by themselves. Ambition to do better and greater things, however, must not lead to the mistake of neglecting routine work. Banking is a business of infinite detail, and accuracy and promptness in minor matters are essential to any complete and logical system of administration.