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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 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 September 30Nine months ended September 30
 2025202420252024
 (dollars in thousands)
Interest cost$768 $790 $2,303 $2,369 
Expected return on plan assets(978)(976)(2,934)(2,927)
Net periodic pension cost$(210)$(186)$(631)$(558)

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

Three months ended September 30Nine months ended September 30
 2025202420252024
 (dollars in thousands)
Interest cost$9 $10 $26 $29 
Net accretion and deferral(136)(135)(407)(406)
Net periodic postretirement benefit$(127)$(125)$(381)$(377)