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STOCK BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Schedule of Cumulatively Granted Stock Options and Restricted Stock Awards, Net of Forfeitures and Expirations | The following table presents the amount of cumulatively granted stock option awards and restricted stock awards, net of forfeitures and expirations, granted through December 31, 2022:
|  | Authorized Awards | Cumulatively Granted, Net of Forfeitures and Expirations |  | Total |  | Authorized but Unissued |
Stock Option Awards |  | Restricted Stock Awards |
2005 Plan |  | 1,650,000 |  | 387,258 |  |  | 986,882 |  |  | 1,374,140 |  |  | 275,860 |  |
2018 Plan |  | 300,000 |  | — |  |  | 38,357 |  |  | 38,357 |  |  | 261,643 |  |
Schedule of Pre-tax Compensation Expense and Related Tax Benefits | The following table presents the pre-tax expense associated with stock option and restricted stock awards and the related tax benefits recognized for the periods presented:
| Years Ended December 31
| 2022 |  | 2021 |  | 2020
| (Dollars in thousands)
Stock based compensation expense |  |  |  |  |
Restricted stock awards (1) | $ | 3,791 |  |  | $ | 3,580 |  |  | $ | 3,272 |
Directors’ fee expense (2) |  |  |  |  |
Restricted stock awards | 673 |  |  | 729 |  |  | 851 |
Total stock based award expense | $ | 4,464 |  |  | $ | 4,309 |  |  | $ | 4,123 |
Related tax benefits recognized in earnings | $ | 1,255 |  |  | $ | 1,212 |  |  | $ | 1,159 |
(1)Inclusive of compensation expense associated with time-vested and performance-based restricted stock awards. (2)Expense related to awards issued to directors is recognized as directors’ fees within other noninterest expense.
Schedule of Relevant Information Relating to Stock Options | The following table presents relevant information relating to the Company’s stock options for the periods presented:
| Years Ended December 31
| 2022 |  | 2021 |  | 2020
| (Dollars in thousands, except per share data)
Fair value of stock options vested based on grant date fair value | $ | — |  |  | $ | — |  |  | $ | 22 |
Intrinsic value of stock options exercised | $ | — |  |  | $ | 414 |  |  | $ | 404 |
Cash received from stock option exercises | $ | — |  |  | $ | 233 |  |  | $ | 279 |
Tax benefit realized on stock option exercises | $ | — |  |  | $ | 116 |  |  | $ | 114 |
Schedule of Stock Options | The following table presents a summary of stock option award activity for the year ended December 31, 2022:
| Outstanding |  |  |  |
| Stock Option Awards |  |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (1) |  |  |  |  |  |  |
| (Dollars in thousands, except per share data) |  |
Balance at January 1, 2022 | 20,000 |  |  |  | $ | 56.18 |  |  |  |  |  |  |  |  |  |  |  |
Granted | — |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |
Exercised | — |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |
Balance of options outstanding, vested and exercisable at December 31, 2022 | 20,000 |  | (2) |  | $ | 56.18 |  |  | 3.35 years |  | $ | 568 |  |  |  |  |  |  |  |
(1)The aggregate intrinsic value represents the total pre-tax intrinsic value, based on the average of the high price and low price at which the Company’s common stock traded on December 31, 2022 of $84.57, which would have been received by in-the-money option holders had they all exercised their options as of that date. (2)Represents vested stock options outstanding to Directors. For the year ended December 31, 2022, all outstanding stock option awards are vested and there is no unrecognized compensation expense related to those options.
Schedule of Restricted Stock Granted | During the years ended December 31, 2022, 2021, and 2020 the Company made the following restricted stock award grants:
| Shares Granted |  | Plan |  | Fair Value |  | Vesting Period
Time-vested |  |  |  |  |  |  |
2022 |  |  |  |  |  |  |
2/17/2022 | 52,100 |  |  | 2005 |  | $ | 84.70 |  |  | Ratably over 5 years from grant date
5/24/2022 | 8,099 |  |  | 2018 |  | $ | 80.39 |  |  | Immediately upon grant date
9/15/2022 | 646 |  |  | 2005 |  | $ | 77.44 |  |  | Ratably over 5 years from grant date
2021 |  |  |  |  |  |  |
2/18/2021 | 49,550 |  |  | 2005 |  | $ | 81.84 |  |  | Ratably over 5 years from grant date
5/25/2021 | 7,680 |  |  | 2018 |  | $ | 78.18 |  |  | Immediately upon grant date
9/1/2021 | 640 |  |  | 2018 |  | $ | 76.78 |  |  | Immediately upon grant date
2020 |  |  |  |  |  |  |
2/27/2020 | 46,550 |  |  | 2005 |  | $ | 70.24 |  |  | Ratably over 5 years from grant date
4/15/2020 | 880 |  |  | 2005 |  | $ | 70.02 |  |  | Ratably over 5 years from grant date
5/27/2020 | 9,438 |  |  | 2018 |  | $ | 72.86 |  |  | Immediately upon grant date
Performance-based |  |  |  |  |  |  |
2/17/2022 | 20,700 |  |  | 2005 |  | $ | 84.70 |  |  | The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2025.
2/18/2021 | 18,900 |  |  | 2005 |  | $ | 81.84 |  |  | The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2024.
2/27/2020 | 17,100 |  |  | 2005 |  | $ | 70.24 |  |  | The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2023.
Schedule of Share-based Compensation, Fair Value of Restricted Stock Awards Vesting [Table Text Block] | The following table presents the fair value of restricted stock awards that vested during the periods presented:
| Years Ended December 31
| 2022 |  | 2021 |  | 2020
| (Dollars in thousands)
Fair value of restricted stock awards upon vesting | $ | 5,148 |  |  | $ | 5,754 |  |  | $ | 5,580 |
Schedule of Restricted Stock Awards | The following table presents a summary of restricted stock award activity for the year ended December 31, 2022:
| Outstanding Restricted Stock Awards |  |  | Weighted Average Grant Price ($) |  |
Balance at January 1, 2022 | 185,173 |  |  |  | $ | 77.03 |  |  |
Granted | 81,545 |  |  |  | 84.21 |  |  |
Vested/released | (61,396) |  |  |  | 75.73 |  |  |
Forfeited (2) | (13,910) |  |  |  | 81.96 |  |  |
Balance at December 31, 2022 | 191,412 |  | (1) |  | $ | 80.15 |  |  |
Unrecognized compensation cost (in thousands) (1) |  |  |  |  |  | $ | 8,916 |
Weighted average remaining recognition period (years) |  |  |  |  |  | 3.09 years
(1)There are no unvested restricted stock awards outstanding to Directors and therefore no related unrecognized compensation cost for Directors.

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