Share-Based Compensation	9 Months Ended
Share-Based Compensation	Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]
Share-Based Compensation	SHARE-BASED COMPENSATION At September 30, 2022, Old National had 9.1 million shares remaining available for issuance under the Company’s Amended and Restated 2008 Incentive Compensation Plan (the “ICP”). An amendment to increase the number of shares authorized for issuance under the ICP by 9.0 million was approved on May 18, 2022. The granting of awards to key employees is typically in the form of restricted stock awards or units. Restricted Stock Awards Old National granted 1.0 million time-based restricted stock awards to certain key employees during the nine months ended September 30, 2022. Additionally, in connection with the First Midwest merger, each restricted stock award of First Midwest common stock that was outstanding, unvested, and unsettled at the merger date was assumed and converted into a number of Old National restricted stock relating to a number of shares of Old National common stock equal to the number of First Midwest restricted stock multiplied by the exchange ratio (rounded up to the nearest whole number) subject to the same vested terms and conditions, resulting in an issuance of an aggregate 0.9 million restricted stock awards of Old National common stock. Shares generally vest annually over a three-year period, cliff vest in three years from the grant date, or vest 50% on the second anniversary of the grant date and 50% on the third anniversary of the grant date. At September 30, 2022, unvested shares totaled 1.9 million. Compensation expense is measured as the fair value of the award at grant date recognized over the service period of the award. Shares are subject to certain restrictions and risk of forfeiture by the participants. At September 30, 2022, unrecognized compensation expense for unvested restricted stock awards was $20.1 million. Old National recorded share-based compensation expense, net of tax, related to restricted stock awards of $2.9 million and $8.3 million during the three and nine months ended September 30, 2022, respectively, compared to $0.8 million and $2.2 million during the three and nine months ended September 30, 2021, respectively. Performance-Based Restricted Stock Units Old National granted 1.2 million shares of performance-based restricted stock units to certain key officers during the nine months ended September 30, 2022. Additionally, in connection with the First Midwest merger, each time-based or performance-based restricted stock unit award of First Midwest that was outstanding, unvested, and unsettled at the merger date was assumed and converted into a time-based restricted stock unit award of Old National common stock subject to the same vested terms and conditions (other than performance conditions), resulting in an issuance of an aggregate 0.7 million restricted stock units of Old National common stock. The performance components of the First Midwest equity awards were deemed earned at target. Shares vest at the end of a 24 or 36 month period based on the achievement of certain targets. If targets are achieved prior to the end of the 24 month performance period, vesting can be accelerated. At September 30, 2022, unvested shares totaled 2.1 million. Compensation expense is recognized on a straight line basis over the performance period of the award. For certain awards, the level of performance could increase or decrease the number of shares earned. Shares are subject to certain restrictions and risk of forfeiture by the participants. As of September 30, 2022, there was $18.2 million of unrecognized compensation cost related to unvested restricted stock units. Old National recorded share-based compensation expense, net of tax, related to restricted stock units of $2.8 million and $8.2 million during the three and nine months ended September 30, 2022, respectively, compared to $0.7 million and $2.0 million during the three and nine months ended September 30, 2021, respectively. Stock Options and Appreciation Rights Old National has not granted stock options since 2009. However, Old National did acquire stock options and stock appreciation rights through its prior acquisitions. Old National recorded no incremental expense associated with the conversion of these options and stock appreciation rights. At September 30, 2022, 8 thousand stock appreciation rights remained outstanding.