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Share-Based Compensation (Details) - USD ($)
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Remaining shares available for issuance (in shares) 2,300   2,300  
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted during period (in shares)     300  
Share-based compensation awards, vesting period     36 months  
Nonvested shares outstanding (in shares) 600   600  
Unrecognized compensation expense $ 7,000,000   $ 7,000,000  
Expected weighted-average period for cost recognition     2 years  
Share-based compensation expense $ 800,000 $ 700,000 $ 2,200,000 $ 1,900,000
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted during period (in shares)     200  
Share-based compensation awards, vesting period     36 months  
Nonvested shares outstanding (in shares) 900   900  
Unrecognized compensation expense $ 4,800,000   $ 4,800,000  
Expected weighted-average period for cost recognition     1 year 9 months 18 days  
Share-based compensation expense $ 700,000 $ 600,000 $ 2,000,000 $ 2,600,000
Stock Options | Old National Bancorp        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Incremental expense associated with conversion of stock appreciation rights     $ 0  
Stock Appreciation Rights (SARs) | Old National Bancorp        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Nonvested shares outstanding (in shares) 28   28