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Retirement Plans and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2024
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,
 2024202320242023
(Dollars in thousands)Retirement PlansOther Post Retirement
Benefits
Service cost$135 $136 $14 $19 
Interest cost600 587 27 32 
Expected loss on plan assets(869)(761)— — 
Amortization of net actuarial loss (gain)176 250 (29)(4)
Net periodic benefit cost$42 $212 $12 $47 
 Six Months Ended June 30,
 2024202320242023
(Dollars in thousands)Retirement PlansOther Post Retirement
Benefits
Service cost$283 $266 $28 $38 
Interest cost1,192 1,184 54 64 
Expected loss on plan assets(1,740)(1,531)— — 
Amortization of net actuarial loss (gain)351 500 (57)(8)
Net periodic benefit cost$86 $419 $25 $94