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Share-Based Compensation and Other Employee Benefit Plans - Additional Information (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
May 18, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Increase in number of shares authorized for issuance (in shares) | 9,000,000 |  |  |
Remaining shares available for issuance (in shares) |  | 9,100,000 |  |
Increase in number of shares authorized for issuance (in shares) |  | $ 28,700,000 | $ 7,500,000 | $ 7,700,000
Total income tax benefit, stock-based compensation cost |  | 7,100,000 | 1,800,000 | 1,900,000
Discretionary profit sharing |  | $ 0 | $ 0 | 0
Shares allocated to the employee stock ownership plan (in shares) |  | 1,200,000 | 500,000 |
Contribution expense under employee stock ownership plan |  | $ 17,900,000 | $ 9,800,000 | 9,500,000
Employer Matching Contribution Tranche One |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Contribution plan, employer matching contribution percentage |  | 100.00% |  |
Defined contribution plans employee contribution percentage of eligible compensation matched by employer |  | 5.00% |  |
Cliff Vest |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation awards, vesting period |  | 3 years |  |
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation awards, vesting period |  | 3 years |  |
Unrecognized compensation expense |  | $ 16,100,000 |  |
Expected weighted-average period for cost recognition (in years) |  | 1 year 9 months 18 days |  |
Total fair value of shares vested |  | $ 7,900,000 | $ 4,300,000 | $ 2,900,000
Restricted Stock | Second Anniversary of Grant Date |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting percentage |  | 50.00% |  |
Restricted Stock | Third Anniversary of Grant Date |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting percentage |  | 50.00% |  |
Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense |  | $ 13,900,000 |  |
Expected weighted-average period for cost recognition (in years) |  | 1 year 3 months 18 days |  |
Restricted Stock Units | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation awards, vesting period |  | 24 months |  |
Restricted Stock Units | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation awards, vesting period |  | 36 months |  |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Contractual term, in years |  | 10 years |  |
Stock Options | Old National Bancorp |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Incremental expense associated with conversion of stock awards |  | $ 0 |  |
Stock Options | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation awards, vesting period |  | 3 years |  |
Stock Options | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation awards, vesting period |  | 5 years |  |
Outside Director Stock Compensation Program | Amended and Restated 2008 Incentive Compensation Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued (in shares) |  | 19,000 | 25,000 | 28,000

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- Definition The number of company shares in the 401(k) plan. Company shares owned through the 401(k) plan are included in the calculation of weighted-average shares outstanding for purposes of calculating basic and diluted earnings-per-share. + References No definition available. + Details
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