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Nature of Operations	12 Months Ended
Nature of Operations	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations	NATURE OF OPERATIONS Old National Bancorp, the financial holding company of Old National Bank, our wholly-owned banking subsidiary, is headquartered in Evansville, Indiana with commercial and consumer banking operations headquartered in Chicago, Illinois. Through Old National Bank and non-bank affiliates, Old National Bancorp provides a wide range of services to its clients throughout the Midwest region and elsewhere, including commercial and consumer loan and depository services, private banking, capital markets, brokerage, wealth management, trust, investment advisory, and other traditional banking services.