Fraud perpetrated against banks is committed by outside thieves, dishonest customers, but most frequently, by insiders. Although legislation and technical and physical security measures can help stem the fraud, managerial control to counteract crime is the real solution. One hundred twenty-seven senior officials at banks in Oklahoma responded to a survey on their perceptions of computer fraud. The findings reveal an awareness of the sources of potential computer fraud among the managers; there were no statistical differences between managers in urban banks versus rural banks or between banks with or without in-house data processing systems. A significantly higher percentage of managers in large banks, as opposed to small banks, felt that programmers, non-EDP employees, and unauthorized electronic users presented potential risks. However, the managers agreed in their perceptions of risk regarding data entry personnel and bank officers. 4 tables, 12 references, and 1 appendix.