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Share-Based Compensation (Detail) - USD ($)
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Remaining shares available for issuance (in shares) 3,200   3,200  
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted during period (in shares)     125  
Share-based compensation awards, vesting period     36 months  
Unrecognized compensation expense $ 4,600,000   $ 4,600,000  
Expected weighted-average period for cost recognition     2 years 1 month 6 days  
Share-based compensation expense 500,000 $ 600,000 $ 1,200,000 $ 1,200,000
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted during period (in shares)     210  
Share-based compensation awards, vesting period     36 months  
Unrecognized compensation expense 5,100,000   $ 5,100,000  
Expected weighted-average period for cost recognition     2 years  
Share-based compensation expense $ 600,000 $ 800,000 $ 2,000,000.0 $ 1,600,000
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]        
Awards outstanding (in shares) 50   50