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Other Borrowings - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Feb. 15, 2022	Oct. 29, 2020	Aug. 31, 2014
Debt Instrument [Line Items]
Lease liability	$ 21,983	$ 13,469
Old National Bank
Debt Instrument [Line Items]
Lease liability	$ 21,983	13,469
First Midwest
Debt Instrument [Line Items]
Subordinated debentures			$ 150,000
Subordinated Debentures | Anchor Bank (MN) | Subordinated Fixed-to-Floating Notes
Debt Instrument [Line Items]
Fixed rate				5.75%
Value of subordinated fixed-to-floating notes assumed				$ 12,000
Subordinated Debentures | Anchor Bank (MN) | Subordinated Fixed-to-Floating Notes | LIBOR
Debt Instrument [Line Items]
Variable rate	4.356%
Old National Bancorp | Senior Unsecured Notes
Debt Instrument [Line Items]
Senior unsecured notes	$ 175,000	$ 175,000			$ 175,000
Fixed rate	4.125%				4.125%

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The amount of financial liabilities assumed (as defined) which have been recognized as of the acquisition date.

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