The group's principal activities are the provision of retail and commercial bank services including commercial, real estate, agricultural and consumer lending; Depository and funds transfer services; Collections; Safe deposit boxes and cash corporate customers. the group also offers trust services and acts as executor, administrator, trustee, transfer agent and in various other fiduciary capacities, item processing, research and other correspondent banking services to financial institutions and government units. the group provides a full range of commercial banking services to retail customers and small to medium-sized businesses through 82 banking locations serving 41 communities of oklahoma region. the group acquired 75% of the outstanding common stock of century life assurance company in 2001. interest and fees on loans accounted for 66% of 2001 revenues; Other interest income, 17% and non-interest income, 17%.