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Retirement Plans and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost (Income)
Information with respect to the Retirement Plans and Other Postretirement Benefits follows: 
 Three Months Ended June 30,
 2025202420252024
(Dollars in thousands)Retirement PlansOther Post Retirement
Benefits
Service cost$142 $135 $11 $14 
Interest cost604 600 27 27 
Expected loss on plan assets(899)(869)— — 
Amortization of net actuarial loss (gain)61 176 (38)(29)
Net periodic benefit (income) cost$(92)$42 $— $12 
 Six Months Ended June 30,
 2025202420252024
(Dollars in thousands)Retirement PlansOther Post Retirement
Benefits
Service cost$274 $283 $22 $28 
Interest cost1,208 1,192 54 54 
Expected loss on plan assets(1,790)(1,740)— — 
Amortization of net actuarial loss (gain)124 351 (49)(57)
Net periodic benefit (income) cost$(184)$86 $27 $25