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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Summary of changes in, the Company's stock option awards |
| Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Life |  | Intrinsic Value
Options outstanding at December 31, 2021 | 31,386 |  |  | $ | 23.53 |  |  | 4.88 |  | $ | 113 |
Exercised | (4,840) |  |  | 23.53 |  |  |  |  |
Expired | (440) |  |  | 23.53 |  |  |  |  |
Options outstanding at December 31, 2022 | 26,106 |  |  | $ | 23.53 |  |  | 3.88 |  | $ | 31 |
Options exercisable at December 31, 2022 | 26,106 |  |  | $ | 23.53 |  |  | 3.88 |  | $ | 31 |
Summary of changes in the Company's RSU, PSU, and DSU awards | A summary of changes in the Company’s RSU awards for the year ended December 31, 2022, is as follows:
| RSU Awards |  |  |  |
| Shares |  | Weighted- Average Grant Date Fair Value |  |  |  |  |  |  |  |
Nonvested at December 31, 2021 | 1,147,927 |  |  | $ | 23.97 |  |  |  |  |  |  |  |  |
Granted | 156,483 |  |  | 25.79 |  |  |  |  |  |  |  |  |
Dividend equivalents earned | 43,916 |  |  | 24.83 |  |  |  |  |  |  |  |  |
Vested | (203,230) |  |  | 27.66 |  |  |  |  |  |  |  |  |
Forfeited | (48,165) |  |  | 23.46 |  |  |  |  |  |  |  |  |
Nonvested at December 31, 2022 | 1,096,931 |  |  | 23.61 |  |  |  |  |  |  |  |  |
A summary of changes in the Company’s PSU awards for the year ended December 31, 2022, is as follows:
| PSU Awards
| Shares 1 |  | Weighted- Average Grant Date Fair Value
Nonvested at December 31, 2021 | 113,915 |  |  | $ | 22.86 |
Granted | 195,240 |  |  | 26.14 |
Dividend equivalents earned 2 | 832 |  |  | 22.63 |
Vested 2 | (8,694) |  |  | 16.86 |
Forfeited 2 | (8,080) |  |  | 25.21 |
Adjustment for performance conditions 2,3 | (7,862) |  |  | 16.25 |
Nonvested at December 31, 2022 | 285,351 |  |  | 25.40 |
Vested and outstanding at December 31, 2022 | 8,694 |  |  | 16.86 |
___________________________________________ 1.Shares for PSU awards represent target shares at grant date. 2.PSUs granted in 2020 vested on December 31, 2022. In January 2023, it was determined that performance criteria had been met at 50% of target. 3.Adjustments for performance conditions represent the difference between the number of target shares at grant date and the number of actual shares earned for the performance period completed. A summary of changes in the Company’s DSU awards for the year ended December 31, 2022, is as follows:
|  |  |  |  | DSU Awards
|  |  |  |  |  |  |  |  | Shares |  | Weighted- Average Grant Date Fair Value
Nonvested at December 31, 2021 |  |  |  |  |  |  |  |  | 34,135 |  |  | $ | 24.59 |
Granted |  |  |  |  |  |  |  |  | 32,658 |  |  | 25.79 |
Dividend equivalents earned |  |  |  |  |  |  |  |  | 5,473 |  |  | 24.47 |
Vested |  |  |  |  |  |  |  |  | (41,181) |  |  | 24.67 |
Nonvested at December 31, 2022 |  |  |  |  |  |  |  |  | 31,085 |  |  | 25.75 |
Vested and outstanding at December 31, 2022 |  |  |  |  |  |  |  |  | 112,434 |  |  | 23.10 |
Schedule of Stock-based compensation expense | The Company recognized compensation expense related to non-vested RSU, PSU, and DSU awards, as well as the 2021 ESPP, as presented in the table below (dollars in thousands):
|  |  | Years Ended December 31,
|  |  |  |  | 2022 |  | 2021 |  | 2020
Stock-based compensation expense |  |  |  |  |  |  |  |  |
RSU awards |  |  |  |  | $ | 4,648 |  |  | $ | 5,809 |  |  | $ | 6,493 |
PSU awards 1 |  |  |  |  | 3,240 |  |  | 979 |  |  | 77 |
DSU awards |  |  |  |  | 876 |  |  | 962 |  |  | 565 |
2021 ESPP |  |  |  |  | 204 |  |  | 114 |  |  | — |
Total stock-based compensation expense |  |  |  |  | $ | 8,968 |  |  | $ | 7,864 |  |  | $ | 7,135 |
___________________________________________ 1.Expense for market-based PSU awards represents amounts based on target shares at grant date. Expense for performance-based PSU awards represents amounts based on target shares at grant date, adjusted for performance expectations as of the date indicated.
Schedule of Unamortized stock-based compensation expense | Unamortized stock-based compensation expense is presented in the table below (dollars in thousands):
| As of December 31,
| 2022 |  | 2021
Unamortized stock-based compensation |  |  |
RSU awards | $ | 8,570 |  |  | $ | 10,204 |
PSU awards 1 | 4,279 |  |  | 1,547 |
DSU awards | 175 |  |  | 209 |
Total unamortized stock-based compensation | $ | 13,024 |  |  | $ | 11,960 |
Weighted average period over which expense is to be recognized | 2.5 yrs |  | 2.9 yrs
___________________________________________ 1.Unamortized expense for market-based PSU awards represents amounts based on target shares at grant date. Unamortized expense for performance-based PSU awards represents amounts based on target shares at grant date, adjusted for performance expectations as of the date indicated.

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