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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Components of Share Based Compensation Awards
The following table summarizes the components of the Corporation's share-based compensation awards recorded as an expense and the income tax benefit of such awards. In 2021 and 2020, the Corporation had RSAs vest primarily at a stock price that was lower than the grant date stock price, which resulted in the recognition of income tax expense at vesting of $112,000 and $394,000, respectively. For the year ended 2019, RSAs vested at a stock price higher than the grant date stock price resulting in recognition of income tax benefit at vesting of $363,000.
Years Ended December 31,
202120202019
Stock and ESPP Options   
Pre-tax compensation expense$155 $96 $101 
Income tax benefit(92)(29)(70)
Stock and ESPP option expense, net of income taxes$63 $67 $31 
Restricted Stock Awards   
Pre-tax compensation expense$4,607 $4,504 $4,014 
Income tax benefit(855)(552)(1,206)
Restricted stock awards expense, net of income taxes$3,752 $3,952 $2,808 
Total Share-Based Compensation:   
Pre-tax compensation expense$4,762 $4,600 $4,115 
Income tax benefit(947)(581)(1,276)
Total share-based compensation expense, net of income taxes$3,815 $4,019 $2,839 
Stock Option Activity Under Stock Option Plans
Stock option activity under the Corporation's stock option plans, as of December 31, 2021, and changes during the year ended December 31, 2021, were as follows:
 Number of
Shares
Weighted-Average
Exercise Price
Weighted Average
Remaining Contractual
Term (in Years)		Aggregate
Intrinsic Value
Outstanding at January 1, 202145,800 $15.00 — $— 
Exercised(17,300)$11.46 — $— 
Outstanding December 31, 202128,500 $17.14 1.50$705,330 
Vested and Expected to Vest at December 31, 202128,500 $17.14 1.50$705,330 
Exercisable at December 31, 202128,500 $17.14 1.50$705,330 
Summary of Unvested RSAs Outstanding
The following table summarizes information on unvested RSAs outstanding as of December 31, 2021:
 Number of
Shares		Weighted-Average
Grant Date Fair Value
Unvested RSAs at January 1, 2021357,883 $36.30 
Granted153,936 $42.49 
Forfeited(6,050)$35.59 
Vested(94,510)$48.27 
Unvested RSAs at December 31, 2021411,259 $35.86