The 1960s saw IB expand domestically as it acquired Rayalaseema Bank (est. 1939), Mannargudi Bank (est. 1932), Bank of Alagapuri, Salem Bank (est. 1925), and Trichy United Bank. Trichy United was the result of the 1965 merger of Woraiyur Commercial Bank (est. 1948), the Palakkarai Bank, and the Tennur Bank (est. 3 March 1947). These were all small banks with the result that all the acquisitions added only about 38 branches to IB's network. Trichy United had five branches and its acquisition in 1967 brought the number of IB branches up to 210.