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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Restricted Shares Activity And Related Information
A summary of the Company’s restricted shares activity and related information is presented below:

Three months ended March 31,
 20212020
Restricted AwardsAverage Market Price at GrantRestricted AwardsAverage Market Price at Grant
Outstanding at January 1158,554 $67.40 148,083 $62.62 
Granted20,536 70.66 23,028 70.36 
Forfeited— 71.43 — — 
Vested(36,685)66.32 (24,910)50.42 
Outstanding at March 31142,405 $67.88 146,201 $65.91 

Information regarding stock-based compensation associated with restricted shares is provided in the following table (in thousands):

Three months ended March 31,
20212020
Stock-based compensation expense associated with restricted shares$783 $629 
At period-end:March 31, 2021
Unrecognized stock-based compensation expense associated with restricted shares$5,310 
Weighted average period (in years) in which the above amount is expected to be recognized2.9
Pension and Other Postretirement Benefits
The following table presents the components of the Company's net periodic benefit cost, which is included in the line item "other expenses" in the consolidated statements of income, (in thousands):
Three months ended March 31,
20212020
Components of net periodic cost:
Interest cost$83 $112 
Expected return on plan assets(205)(203)
Net amortization and deferral280 272 
Net Periodic Pension Cost$158 $181