The bank was founded in 1834. In November 1995, Old National acquired the
Greencastle-based First United Savings Bank for $18 million in stock. In the following year, Old National acquired the Bloomington-based Workingmens Capital Holdings with its Workingmens Federal Savings Bank subsidiary for an undisclosed amount in stock. In 2009,
Charter One's Indiana bank branches became Old National Bank after Old National Bank bought Charter One's Indiana operations. In January 2011, Old National acquired
Bloomington-based Monroe Bancorp with its Monroe Bank subsidiary for $90 million in stock. Later that year,
Integra Bank was closed by the
Federal Deposit Insurance Corporation and all deposit accounts, excluding certain brokered deposits, were transferred to Old National. In 2012, Old National acquired 24 retail bank branches of
Bank of America in Indiana and Michigan. In 2014, Old National acquired four banks: Tower Bank in
Fort Wayne, Indiana, United Bank in
Ann Arbor, Michigan, Lafayette Savings Bank in
Lafayette, Indiana, and Founders Bank & Trust in
Grand Rapids, Michigan. In May 2016, AnchorBank, the third-largest bank based in
Wisconsin, was bought by Old National for approximately $461 million. In August 2017, Old National agreed to buy Anchor Bank of
Minnesota for $303 million. The acquisition will add 17 locations in the
Twin Cities and 1 in
Mankato plus $1.7 billion in deposits and $2.1 billion in assets. In June 2018,
KleinBank, based in
Chaska, Minnesota, announced its 21 locations were being acquired by Old National, increasing Old National's presence in the western suburbs of Minneapolis. In 2021, Old National merged with
First Midwest Bancorp, combining the companies' assets, retaining the Old National name, and maintaining headquarters in Chicago and
Evansville. On April 10, 2023,
a mass shooting at the Louisville, Kentucky branch resulted in five fatalities (all employees) and eight other injured people, including a rookie police officer. The injured officer's partner subsequently killed the perpetrator, who was a current bank employee. In 2024, it was announced that CapStar Financial Holdings Inc. merged its operations with those of the bank. As a result,
CapStar Bank became a division of Old National Bank. On November 25, 2024, Old National announced its purchase of Minnesota-based
Bremer Bank in a $1.4 billion sale which was finalized in October, 2025. The merger created a combined bank worth $70 billion. ==Services==