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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The net periodic pension cost for the Corporation’s Defined Benefit Pension Plan ("Pension Plan") consisted of the following components:
Three months ended March 31
 20212020
         (in thousands)
Interest cost$561 $681 
Expected return on plan assets(1,011)(982)
Net amortization and deferral504 465 
Net periodic pension cost$54 $164 
The components of the net benefit for the Corporation’s Postretirement Benefits Plan ("Postretirement Plan") consisted of the following components:
Three months ended March 31
 20212020
         (in thousands)
Interest cost$8 $11 
Net accretion and deferral(134)(137)
Net periodic benefit$(126)$(126)