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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2025
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 June 30Six months ended June 30
 2025202420252024
 (dollars in thousands)
Interest cost$767 $789 $1,535 $1,579 
Expected return on plan assets(978)(975)(1,956)(1,951)
Net periodic pension cost$(211)$(186)$(421)$(372)

The components of the net benefit for the Postretirement Plan consisted of the following components:

Three months ended June 30Six months ended June 30
 2025202420252024
 (dollars in thousands)
Interest cost$8 $9 $17 $19 
Net accretion and deferral(135)(136)(271)(271)
Net periodic postretirement benefit$(127)$(127)$(254)$(252)