Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2021

Compensation And Retirement Disclosure [Abstract]

Summary of Components of Net Periodic Pension Cost

The following table summarizes the components of net periodic pension cost for the three and nine months ended September 30, 2021 and 2020.

	Three Months Ended				Nine Months Ended
	September 30, 2021		September 30, 2020		September 30, 2021		September 30, 2020
(Dollars in thousands)
Interest cost	$	206	$	251	$	618	$	753
Net amortization		96		72		290		216
Net periodic pension cost	$	302	$	323	$	908	$	969