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Other Borrowings - Additional Information (Details) - USD ($) $ in Thousands	Nov. 01, 2017	Dec. 31, 2021	Dec. 31, 2020	Aug. 31, 2014
Debt Instrument [Line Items]
Lease liability		$ 17,233	$ 11,813
Old National Bank
Debt Instrument [Line Items]
Lease liability		17,233	11,813
Subordinated Debentures | Anchor Bank (MN) | Subordinated Fixed-To-Floating Notes
Debt Instrument [Line Items]
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]
Fixed rates	5.75%
LIBOR rate	4.356%
Old National Bancorp | Senior Unsecured Notes
Debt Instrument [Line Items]
Senior unsecured notes		$ 175,000	$ 175,000	$ 175,000
Fixed rates		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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