Indian Overseas Bank (IOB) was set up in 1937 for undertaking banking activities. The bank simultaneously established domestic and overseas branches with the twin objectives of specializing in foreign exchange business and overseas banking. As on 31 March 2005, the bank had 1,496 branches in India comprising 548 rural, 370 semiurban, 312 urban and 266 metropolitan/port town branches. There were 252 extension counters. The bank also sponsors three regional rural banks, namely Pandyan Grama Bank, Puri Gramya Bank and Dhenkanal Gramya Bank in Orissa. The bank has recently completed the the acquisition of Bharat Overseas Bank for a sum of Rs 1.7 billion. Besides developing in-house software for routine banking operations, other customer support products such as any branch banking (ABB), home utility banking service (HUBS) and speedy transfer and realization services (STARS) have been developed.
The bank has also been awarded an ISO 9001 certificate for its computer policy and planning department from Det Norske Veritas (DNV), Netherlands. The bank has been assigned the role of lead bank in 13 districts in two states. They number 12 in Tamil Nadu and one in Kerala. The assigned lead bank responsibilities are discharged by maintaining inter-institutional coordination in the preparation and implementation of various development programs in each district.