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Stock Options and Other Equity-Based Incentive Instruments (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Stock Option Activity | Stock option activity is summarized in the following table for the dates indicated:
| Number of Shares |  | Option Price per Share |  | Weighted Average Exercise Price
Outstanding at January 1, 2021 | 128,500 |  |  | $14.54 to $23.21 |  | $ | 17.72 |
Options granted | — |  |  | — |  |  | — |
Options exercised | (49,675) |  |  | $14.54 to $16.59 |  | $ | 15.25 |
Options forfeited | — |  |  | — |  |  | — |
Outstanding at December 31, 2021 | 78,825 |  |  | $15.34 to $23.21 |  | $ | 19.28 |
Options granted | — |  |  | — |  |  | — |
Options exercised | (63,325) |  |  | $15.34 to $19.46 |  | $ | 18.79 |
Options forfeited | — |  |  | — |  |  | — |
Outstanding at December 31, 2022 | 15,500 |  |  | $19.46 to $23.21 |  | $ | 21.27 |
Summary of Options Outstanding | The following table shows the number, weighted-average exercise price, intrinsic value, and weighted average remaining contractual life of options exercisable, options not yet exercisable and total options outstanding as of December 31, 2022:
| Currently Exercisable |  | Currently Not Exercisable |  | Total Outstanding
Number of options | 15,500 |  |  | — |  |  | 15,500 |
Weighted average exercise price | $ | 21.27 |  |  | $ | — |  |  | $ | 21.27 |
Intrinsic value (in thousands) | $ | 461 |  |  | $ | — |  |  | $ | 461 |
Weighted average remaining contractual term (yrs.) | 1 year |  | n/a |  | 1 year
Information about Options | The following table shows the total intrinsic value of options exercised, the total fair value of options vested, total compensation costs for options recognized in income, total tax benefit and excess tax benefits recognized in income related to compensation costs for options during the periods indicated:
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
Intrinsic value of options exercised | $ | 1,190,000 |  |  | $ | 1,476,000 |  |  | $ | 403,000 |
Fair value of options that vested | — |  |  | — |  |  | — |
Total compensation costs for options recognized in expense | — |  |  | — |  |  | — |
Total tax benefit recognized in income related to compensation costs for options | — |  |  | — |  |  | — |
Excess tax benefit recognized in income | — |  |  | — |  |  | — |
Restricted Stock Unit (RSU) Activity | Restricted stock unit activity is summarized in the following table for the dates indicated:
| Service Condition Vesting RSUs |  | Market Plus Service Condition Vesting RSUs
| Number of RSUs |  | Weighted Average Fair Value on Date of Grant |  | Number of RSUs |  | Weighted Average Fair Value on Date of Grant
Outstanding at January 1, 2022 | 103,517 |  |  |  |  | 99,763 |  |  |
RSUs granted | 84,278 |  |  | $ | 44.00 |  |  | 37,877 |  |  | $ | 40.74 |
Additional market plus service condition RSUs vested | — |  |  |  |  | 4,740 |  |  |
RSUs added through dividend credits | 2,896 |  |  |  |  | — |  |  |
RSUs released through vesting | (50,076) |  |  |  |  | (26,338) |  |  |
RSUs forfeited/expired | (1,421) |  |  |  |  | (1,561) |  |  |
Outstanding at December 31, 2022 | 139,194 |  |  |  |  | 114,481 |  |  |
Summary of Compensation Costs and Excess Tax Benefits for RSUs | The following table shows the compensation costs and excess tax benefits for RSUs recognized in income for the periods indicated:
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
Total compensation costs recognized in income |  |  |  |  |
Service condition vesting RSUs | $ | 2,883,000 |  |  | $ | 1,728,000 |  |  | $ | 1,390,000 |
Market plus service condition vesting RSUs | 986,000 |  |  | 910,000 |  |  | 646,000 |
Excess tax benefit recognized in income |  |  |  |  |
Service condition vesting RSUs | $ | 1,079,000 |  |  | $ | 626,000 |  |  | $ | 372,000 |
Market plus service condition vesting RSUs | 355,000 |  |  | 226,000 |  |  | 194,000 |

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