FNBO is the great big small bank with branch locations serving the Yorkville, Sandwich, Oswego, Sugar Grove, Dekalb, Sycamore, Huntley, Lake of the Hills, Marengo, Belvidere and Harvard communities in Illinois. Whether you’re looking to open a checking account, buying a home or financing your business we’re here to help. We want to show you why we're considered one of the best bank in Illinois. Visit an Illinois bank branch today.