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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2023
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The net periodic pension cost for the Pension Plan consisted of the following components:
Three months ended March 31
 20232022
 (dollars in thousands)
Interest cost$856 $598 
Expected return on plan assets(877)(1,098)
Net amortization and deferral80 163 
Net periodic pension cost$59 $(337)

The components of the net benefit for the Postretirement Plan consisted of the following components:
Three months ended March 31
 20232022
 (dollars in thousands)
Interest cost$13 $8 
Net accretion and deferral(136)(131)
Net periodic benefit$(123)$(123)