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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 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 September 30Nine months ended September 30
 2021202020212020
         (in thousands)
Interest cost$561 $681 $1,683 $2,043 
Expected return on plan assets(1,011)(982)(3,033)(2,946)
Net amortization and deferral504 465 1,513 1,395 
Net periodic pension cost$54 $164 $163 $492 

The components of the net benefit for the Corporation’s Postretirement Benefits Plan ("Postretirement Plan") consisted of the following components:
Three months ended September 30Nine months ended September 30
 2021202020212020
         (in thousands)
Interest cost$8 $11 $24 $33 
Net accretion and deferral(134)(137)(402)(411)
Net periodic benefit$(126)$(126)$(378)$(378)