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Other Borrowings - Additional Information (Details) - USD ($) $ in Thousands	Nov. 01, 2017	Sep. 30, 2022	Feb. 15, 2022	Dec. 31, 2021	Aug. 31, 2014
Debt Instrument [Line Items]
Lease liability		$ 15,700		$ 17,233
Old National Bank
Debt Instrument [Line Items]
Lease liability		15,700		17,233
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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Present value of lessee's discounted obligation for lease payments from finance lease.

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