CNB Bank Shares, Inc. operates as the bank holding company for CNB Bank & Trust. N.A. that provides banking services to individual and corporate customers in south-central Illinois, suburban southwestern Chicago, and the St. Louis metropolitan area. The company offers checking and savings accounts, certificate of deposits, individual retirement accounts, money market accounts, and time deposits; and loans and credits, which include student, commercial real estate, agricultural, business, construction, residential real estate, multifamily real estate, farm real estate, small business, consumer, mortgage, government guaranteed, and working capital loans, as well as lines of credit and letters of credits, home equity and lines of credit, equipment financing, special financing, and loans to acquire existing business. It provides overdraft, night depository, safe deposit box, cash management, wire transfer, cashier's check, ATMs, and notary services; credit and debit cards; digital wallet; mobile check deposit; payment services; online and mobile banking services; and trust administration, investment management, estate administration and guardianship, and institutional/nonprofit services. It operates through ATMS and branches in Alton, Brighton, Carlinville, Chapin, Clayton, Glen Carbon, Hillsboro, Jacksonville, Jerseyville, Litchfield, Oak Forest, Palos Heights, Pittsfield, Taylorville, Tinley Park, and Virden. The company was founded in 1854 and is headquartered in Carlinville, Illinois.