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Defined Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Schedule of Net Periodic Benefit Costs
The components of net periodic benefit costs from these defined benefit plans are as follows:
Three Months Ended September 30,
(Dollars in thousands)Pension Benefits Other Benefits
2022202120222021
Service cost$36 $33 $1 $1 
Interest cost43 40 9 3 
Expected return on plan assets(59)(57)— — 
Accretion of prior service cost— — (5)(5)
Amortization of net (gain) loss(2)— 1 1 
Net periodic benefit expense$18 $16 $6 $— 
Nine Months Ended September 30,
(Dollars in thousands)Pension Benefits Other Benefits
2022202120222021
Service cost$108 $98 $11 $2 
Interest cost130 120 27 7 
Expected return on plan assets(177)(170)— — 
Accretion of prior service cost— — (15)(15)
Amortization of net (gain) loss(5)— 6 5 
Settlement gain— (49)— — 
Net periodic benefit expense (income)$55 $(1)$29 $(1)