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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of 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.
Three Months Ended
June 30,		Six Months Ended
June 30,
 2021202020212020
Stock and ESPP Options    
Pre-tax compensation expense$40 $12 $115 $53 
Income tax expense (benefit)(20)(29)(92)(29)
Stock and ESPP option expense, net of income taxes$20 $(17)$23 $24 
Restricted Stock Awards    
Pre-tax compensation expense$1,168 $1,202 $2,283 $2,380 
Income tax expense (benefit)(246)(236)(483)(493)
Restricted stock awards expense, net of income taxes$922 $966 $1,800 $1,887 
Total Share-Based Compensation    
Pre-tax compensation expense$1,208 $1,214 $2,398 $2,433 
Income tax expense (benefit)(266)(265)(575)(522)
Total share-based compensation expense, net of income taxes$942 $949 $1,823 $1,911 
Schedule of stock option activity under stock option plans
Stock option activity under the Corporation's stock option plans as of June 30, 2021 and changes during the six months ended June 30, 2021, were as follows:
 Number of
Shares		Weighted-Average Exercise PriceWeighted Average Remaining
Contractual Term
(in Years)		Aggregate
Intrinsic
Value
Outstanding at January 1, 2021
45,800 $15.00   
Exercised(17,300)$11.46   
Outstanding June 30, 2021
28,500 $17.14 2.00$699,060 
Vested and Expected to Vest at June 30, 202128,500 $17.14 2.00$699,060 
Exercisable at June 30, 202128,500 $17.14 2.00$699,060 
Schedule of unvested RSAs outstanding
The following table summarizes information on unvested RSAs outstanding as of June 30, 2021:
 Number of SharesWeighted-Average
Grant Date Fair Value
Unvested RSAs at January 1, 2021
357,883 $36.30 
Granted77,216 $42.52 
Vested(4,660)$42.14 
Forfeited(5,050)$36.56 
Unvested RSAs at June 30, 2021
425,389 $37.36