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Share-Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Remaining shares available for issuance 4,400,000   4,400,000  
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted during period     212,000  
Share-based compensation awards, vesting period     36 months  
Unrecognized compensation expense $ 5,200,000   $ 5,200,000  
Expected weighted-average period for cost recognition (in years)     2 years 1 month 6 days  
Share-based compensation expense 600,000 $ 400,000 $ 1,700,000 $ 1,400,000
Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted during period     288,000  
Share-based compensation awards, vesting period     36 months  
Unrecognized compensation expense 4,900,000   $ 4,900,000  
Expected weighted-average period for cost recognition (in years)     1 year 9 months 18 days  
Share-based compensation expense $ 900,000 $ 500,000 $ 2,500,000 1,500,000
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense     0 0
Stock Appreciation Rights (SARs) [Member] | Old National Bancorp [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Incremental expense associated with conversion of stock appreciation rights     $ 0 $ 0
Stock appreciation rights, Outstanding 62,000   62,000