The entablature of the building is made up of three parts and are located above the last band of windows that rap the top of the building. It sets itself apart from the rest of the skyscraper because it is very decorative and made of a darker colored stone. The first part of the entablature is the architrave. This is the decorative band of rounded stone that is above the top set of windows. The second part of the entablature is the frieze. The First National Bank Building does not have much of a frieze. The frieze consists of the small, flat pieces of stone that separate the architrave and the cornice. The third part of the entablature is the cornice. The cornice is the very decorative band of sculpted stone that protrudes from the building and gives it a defined end. It has curved modillions which are the carved, ornamental brackets that are underneath the crown molding which is the very top of the cornice.

There are miniature entablatures on the building that visually breaks up the three sections that were previously mentioned: the base, the shaft, and the top. Out of these entablatures, the most decorative and most architecturally significant is the one at the very top.