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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2026
Retirement Benefits [Abstract]  
Schedule of components of net periodic benefit costs, before allocation to the overhead pool, for Registrant's pension plan, postretirement plan, and SERP
The components of net periodic benefit costs for Registrant’s pension plan, postretirement medical benefit plan and SERP for the three and six months ended June 30, 2026 and 2025 were as follows:
For The Three Months Ended June 30,
Pension BenefitsOther
Postretirement
Benefits		SERP
(dollars in thousands)202620252026202520262025
Components of Net Periodic Benefits Cost:
Service cost$730 $668 $25 $27 $202 $180 
Interest cost2,750 2,676 18 21 506 485 
Expected return on plan assets(3,552)(3,179)(179)(161)— — 
Amortization of prior service cost108 110 — — — — 
Amortization of actuarial (gain) loss(429)— (71)(292)— — 
Net periodic benefits costs under accounting standards$(393)$275 $(207)$(405)$708 $665 
For The Six Months Ended June 30,
Pension BenefitsOther
Postretirement
Benefits		SERP
(dollars in thousands)202620252026202520262025
Components of Net Periodic Benefits Cost:
Service cost$1,482 $1,442 $52 $54 $404 $361 
Interest cost5,463 5,382 37 45 1,012 970 
Expected return on plan assets(7,106)(6,362)(358)(322)— — 
Amortization of prior service cost217 218 — — — — 
Amortization of actuarial (gain) loss(910)— (142)(583)— — 
Net periodic benefits costs under accounting standards$(854)$680 $(411)$(806)$1,416 $1,331