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Note 8 - Stock-based Compensation | 3 Months Ended
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Mar. 31, 2025
Notes to Financial Statements |
Share-Based Payment Arrangement [Text Block] | 8. STOCK-BASED COMPENSATION Stock-based compensation plans are used to provide directors and employees with an increased incentive to contribute to our long-term performance and growth, to align the interests of directors and employees with the interests of our shareholders through the opportunity for increased stock ownership and to attract and retain directors and employees. Stock-based compensation expense, reported as noninterest expense in the Consolidated Statements of Income, totaled $0.8 million and $0.7 million during the three months ended March 31, 2025 and 2024, respectively. The Stock Incentive Plan of 2020 was approved by shareholders in May, 2020, and was effectively replaced with the Stock Incentive Plan of 2023 that was approved by shareholders in May, 2023. Under the Stock Incentive Plan of 2023, incentive awards may include, but are not limited to, stock options, restricted stock, stock appreciation rights and stock awards. Price, vesting and expiration date parameters are determined by Mercantile’s Compensation Committee on a grant-by-grant basis. No payments are required from employees for restricted stock awards. The restricted stock awards granted through the plan fully vest after three years and, in the case of performance-based restricted stock issued to executive officers issued under the plan, are subject to the attainment of pre-determined performance goals. There were no restricted stock grants during the three months ended March 31, 2024. A summary of restricted stock activity during the three months ended March 31, 2025, is as follows:
|  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |
|  | Shares |  |  | Fair Value |
Nonvested at beginning of the period |  |  | 228,646 |  |  | $ | 35.84 |
Grants |  |  | 84,685 |  |  | $ | 50.34 |
Vested |  |  | (34,053 | ) |  |  | 34.79 |
Forfeited |  |  | (845 | ) |  |  | 34.42 |
Nonvested at end of the period |  |  | 278,433 |  |  | $ | 40.38 |
Of the restricted stock shares granted during the three months ended March 31, 2024, 24,910 shares are performance-based awards made to our Named Executive Officers at the target level and are subject to the attainment of pre-determined performance goals. As of March 31, 2025, there were approximately 298,000 shares authorized for future incentive awards, and as of December 31, 2024, there were approximately 383,000 shares authorized for future incentive awards. We periodically grant shares of common stock to our Corporate and Bank Board Directors for retainer payments with the related expense being recorded over the period of the Directors' service, as summarized below:
|  |  |  |  |  | Total Cost |  |
Grant Year |  | Shares Granted |  |  | (in thousands) |  | Covered Period
2023 |  |  | 11,529 |  |  |  | 350 |  | June 1, 2023 - May 31, 2024
2024 |  |  | 11,316 |  |  |  | 423 |  | June 1, 2024 - May 31, 2025

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