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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Summary of Activity Under RSU Plan | The following table is a summary of the activity under the Company's RSU plan.
|  |  |  |  | Wgtd. Avg. |
|  | Restricted |  |  | Grant Date |
|  | Stock Units |  |  | Fair Value |
Nine Months Ended September 30, 2025 |  |  |  |  |  |
Nonvested at December 31, 2024 |  |  | 42,825 |  |  | $ | 90.35 |
Granted |  |  | 23,000 |  |  |  | 129.56 |
Vested |  |  | (1,815 | ) |  |  | 96.39 |
Forfeited |  |  | (750 | ) |  |  | 109.61 |
Nonvested at September 30, 2025 |  |  | 63,260 |  |  |  | 104.21 |
Summary of Accumulated Stock Units | A summary of the accumulated stock units under the Deferred Stock Compensation Plan is as follows:
|  | September 30, 2025 |  |  | December 31, 2024 |
Accumulated stock units |  |  | 120,610 |  |  |  | 120,984 |
Average price |  | $ | 49.32 |  |  | $ | 44.70 |
Summary of Activity Under Stock Option Plan | The following table is a summary of the activity under both the Employee Plan and the Non-Employee Directors’ Plan:
|  |  |  |  |  |  |  | Wgtd. Avg. |  |  |
|  |  |  |  | Wgtd. Avg. |  |  | Remaining |  | Aggregate |
|  |  |  |  | Exercise |  |  | Contractual |  | Intrinsic |
|  | Options |  |  | Price |  |  | Term |  | Value |
|  | (Dollars in thousands, except option data) |
Nine Months Ended September 30, 2025 |  |  |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2024 |  |  | 947,921 |  |  | $ | 58.42 |  |  |  |  |  |
Options exercised |  |  | (104,451 | ) |  |  | 42.19 |  |  |  |  |  |
Options canceled, forfeited, or expired |  |  | (5,000 | ) |  |  | 90.56 |  |  |  |  |  |
Outstanding at September 30, 2025 |  |  | 838,470 |  |  |  | 60.25 |  |  | 9.31 Yrs. |  | $ | 55,506 |
Exercisable at September 30, 2025 |  |  | 359,720 |  |  |  | 46.40 |  |  | 7.33 Yrs. |  | $ | 28,794 |
Options Exercised Under Stock Option Plan | The following table has additional information regarding options exercised under both the Employee Plan and the Non-Employee Directors’ Plan:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
|  | (Dollars in thousands) |
Total intrinsic value of options exercised |  | $ | 4,785 |  |  | $ | 6,846 |  |  | $ | 8,965 |  |  | $ | 11,931 |
Cash received from options exercised |  |  | 2,618 |  |  |  | 3,639 |  |  |  | 4,406 |  |  |  | 6,061 |
Tax benefit realized from options exercised |  |  | 1,150 |  |  |  | 1,646 |  |  |  | 2,155 |  |  |  | 2,868 |
Stock-based Employee Compensation Expense | The components of stock-based compensation expense for all share-based compensation plans and related tax benefits are as follows:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
|  | (Dollars in thousands) |
Stock-based compensation expense |  | $ | 1,057 |  |  | $ | 945 |  |  | $ | 2,766 |  |  | $ | 2,580 |
Tax benefit |  |  | 254 |  |  |  | 227 |  |  |  | 665 |  |  |  | 620 |
Stock-based compensation expense, net of tax |  | $ | 803 |  |  | $ | 718 |  |  | $ | 2,101 |  |  | $ | 1,960 |
Unearned Stock-based Compensation Expense |
|  | September 30, 2025 |
|  | (Dollars in thousands) |
Unearned stock-based compensation expense for unvested stock options |  | $ | 5,699 |
Unearned stock-based compensation expense for unvested RSU's |  |  | 5,467 |

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